Love or hate speaker cabinets I made for Tannoy MG 15's [Archive]

Denzil

22-05-2020, 17:58

Hi,

I inherited MG 15's in sealed Lanchester cabinets. And just made these cabinets at home, working with brilliant traditional carpenters. One inch solid Teak wood cladding on one inch birch ply with half inch sound damping and 2.5 inches of rock wool. Aperiodic shelf, like the old Lockwood cabinets but with ports tuned to 29 Hz (highly controversial design) :)
Five feet tall, 143 kgs each.

We started with a log of teak wood

https://i.postimg.cc/xdhcQvJ6/7-AFCD53-C-693-C-44-EB-AF3-E-44-EA03-D275-BD.jpg (https://postimg.cc/Mc0WbjYB)

And birch ply

https://i.postimg.cc/cJ0VHH2w/0-C61-EEFB-A4-C4-4121-9-E47-32187266-FF87.jpg (https://postimg.cc/Sn1Z1yyx)

https://i.postimg.cc/c4QW4V6q/F15868-A4-9-F78-429-E-AC70-9-CCA4804-B6-E0.jpg (https://postimg.cc/WhbC5YMS)

The shelf you see at the bottom is also a window pane brace but the cut outs weren't yet cut out when the photo was taken.

https://i.postimg.cc/d3YWWSFd/29-E9-E7-F3-3-DC7-417-E-9-C32-E3-A81424-AE61.jpg (https://postimg.cc/tZBtJkYC)

Working with teak wood is a joy

https://i.postimg.cc/jjRSbRhk/3548-CED6-247-B-46-EE-8-D86-811-BF0-B4445-A.jpg (https://postimg.cc/cv5S7y2Q)
https://i.postimg.cc/Kjb2nNsp/C48150-D7-CD0-D-4724-8-D6-F-AC9354559079.jpg (https://postimg.cc/S2g34W4c)

https://i.postimg.cc/wTbrz2QK/D94-FC4-FC-9-CB7-4668-9529-4-E7-B3-FA4-E852.jpg (https://postimg.cc/4mVPbz0w)

https://i.postimg.cc/NfLNdTqd/BC0-CFD45-49-BA-4206-B47-A-54322-D06124-D.jpg (https://postimg.cc/JGVcnshX)

https://i.postimg.cc/sxL4k6dw/AF788-C51-B339-40-D2-AEA3-27693-D9-AE1-BC.jpg (https://postimg.cc/1VpF6Kzq)

https://i.postimg.cc/BvNHWY2H/C2-BD5-AE2-3617-49-CE-B674-AE6-E080-F7823.jpg (https://postimg.cc/Z9BCpL75)

https://i.postimg.cc/P5TQB8BG/82-F095-DF-4-FE9-47-A8-8-FC3-E3-F8-C4716146.jpg (https://postimg.cc/zV2hh3zp)calf toning exercises (https://ralphrobertspersonaltrainer.com/5-calf-toning-exercises)

https://i.postimg.cc/Vv9bRKsJ/C2-A99226-D27-B-4-BAF-9-AA7-3-D0-BDB905334.jpg (https://postimg.cc/LgXX4B1S)do push ups work your abs (https://ralphrobertspersonaltrainer.com/6-reasons-to-do-push-ups)

https://i.postimg.cc/VLDJkrJP/C5-A4150-F-45-D3-4-C1-D-8-FDB-4457234429-A5.jpg (https://postimg.cc/9rwmxfPL)

https://i.postimg.cc/7Z5ZPBvS/36889446-9-F9-D-4-F6-B-82-A4-86-DF1-E9685-E3.jpg (https://postimg.cc/HrCgB9kL)short vs long term goals (https://ralphrobertspersonaltrainer.com/short-term-fitness-goals-vs-long-term-fitness-goals)

https://i.postimg.cc/05tv6p0n/D6842-B6-B-EB74-49-A0-93-EA-BBD2744-D7-FD3.jpg (https://postimg.cc/rzt33RbR)

https://i.postimg.cc/1t5TPj2Q/DDBEBD9-A-BD45-4662-9995-90-A367-A7998-F.jpg (https://postimg.cc/5HTpSnf7)

https://i.postimg.cc/pT4gZBcM/4-A64-CA05-7-AFC-4-C16-957-B-A83187619570.jpg (https://postimg.cc/CBCPMbVc)

https://i.postimg.cc/nh3S2kMS/BF18-EBE6-F8-FD-4895-90-F6-94-E0-D2134370.jpg (https://postimg.cc/4Yh1Np6p)

Let me know what you think !

Happy to answer questions.

Regards,

Denzil

walpurgis

22-05-2020, 18:14

They look really well made. An improvement over the Lancaster boxes I'm sure. You did a good job with the bracing 'shelves'.

WullieD20

22-05-2020, 18:17

Blimey..... you get a whole load of teak veneer from a baulk of timber that size!!!! LOL.

Seriously, what a pleasure to see cabinets made with REAL timber to such a level of quality. I sincerely hope they sound as good as they look.

Well done, beautiful job. . .:wow:

Roy S

22-05-2020, 18:21

Excellent! Thanks for sharing.

Sherwood

22-05-2020, 18:21

Beautiful cabinets! I hope you will plant a few teak trees to replace those used.:)

Denzil

22-05-2020, 18:30

Denzil

22-05-2020, 18:36

They look really well made. An improvement over the Lancaster boxes I'm sure. You did a good job with the bracing 'shelves'.

Thanks !

Denzil

22-05-2020, 18:37

Thanks ! They sound magnificent. Tent to be slightly bass heavy but not boomy. But I'm working on that. Many because of room acustics, I think.

Sherwood

22-05-2020, 18:39

I'm a serious conservationists. Have been working on environmental issues for many years. And now concreting on the protection of marine turtle nesting beaches, one such beach happens to be my property. The teak I got was obtained from teak plantations. Wild teak is not logged anymore (thankfully). The Instagram link in my signature (below) will show you what I do.

Well done. Teak is a great wood and, as you know, no problem in using it so long as it is from sustainable sources. It is a luxury though to be able to use solid wood rather than just veneers. I wouldn't like to think how much those "slabs" would cost in the UK!

RMutt

22-05-2020, 18:43

Amazing. They are a work of art. I love that level of handmadeness! I can only imagine that they sound great too.

WESTLOWER

22-05-2020, 19:18

Nice looking speakers !!
What’s the volume size of the cabinet ?

Denzil

22-05-2020, 19:46

Denzil

22-05-2020, 19:49

Nice looking speakers !!
What’s the volume size of the cabinet ?

Volume is 155 ltrs (net) excluding bracing, speaker cone and cage, ports etc. Total is around 165 ltrs.

Denzil

22-05-2020, 19:51

Amazing. They are a work of art. I love that level of handmadeness! I can only imagine that they sound great too.

Thank you. That's a huge complement ! They sound magnificent. Much better than the Lancaster cabinets.

graham67

22-05-2020, 20:48

Great job Denzil , they look gorgeous. :youtheman:

rigger67

22-05-2020, 21:12

topoxforddoc

22-05-2020, 21:18

Denzil,
I love the speakers, but I love your family resort even more - truly beautiful and an enduring part of your family's history.
Charlie

Pharos

22-05-2020, 21:22

Mikeandvan

22-05-2020, 22:04

Lovely, nice choice of cloth. Nice doggies too.

fatmarley

22-05-2020, 22:53

Thanks ! They sound magnificent. Tent to be slightly bass heavy but not boomy. But I'm working on that. Many because of room acustics, I think.

If you block one of the ports it will lower the tuning frequency (stuff something in tight, like some socks). I modelled the 15" Monitor gold in your enclosure and it looks like you will get either a large peak at the tuning frequency, or a dip in the midbass area. It's impossible to know without measurements. If you stuff a port (or two) and find the bass heavy sound is gone then all is good, but if you find you also lose midbass then the enclosure is too big.

I'd also experiment with removing the material on the shelf. For ports to work efficiently, you want a free passage from the driver to the ports. Another thing I'd do is lightly fill the whole section below the ports to reduce standing waves (assuming you can). Polyester stuffing would do the job.

RobbieGong

22-05-2020, 22:53

Look fab !! :thumbsup:

drSM

23-05-2020, 03:19

no question of hating them Denzil. i love them
well done !

Macca

23-05-2020, 05:47

They look superb. Amazing work. Great photos too. Looks like they are building them in a clearing in the rain forest.

Denzil

23-05-2020, 08:20

Stunning work, sir.

To a ham-fisted idiot like me living in the urban jungle - ie, no garden, no garage, three flights up - your handiwork is something I can only dream about.

The way you blended the cloth from the grille into the cabinet with that glorious retro logo .. it's simply gorgeous.

Beautiful stuff :youtheman::youtheman::youtheman:

Thanks Paul. Yes the cloth grill is properly integrated with the woodwork of the cabinet. It follows the curve of the wooden edge. May not be noticeable in the photos but the cloth is not flat, it's slightly curved.

Denzil

Denzil

23-05-2020, 08:22

Denzil,
I love the speakers, but I love your family resort even more - truly beautiful and an enduring part of your family's history.
Charlie

Thanks Charlie, you should come visit someday !

Denzil

Denzil

23-05-2020, 08:26

They look superb. Amazing work. Great photos too. Looks like they are building them in a clearing in the rain forest.

Thanks !

Yes, I do live in a heavily wooded area and the palms you see in the photos is an areca nut plantation around my home.

Denzil

Denzil

23-05-2020, 08:26

no question of hating them Denzil. i love them
well done !

Thanks !

Denzil

Denzil

23-05-2020, 08:27

Look fab !! :thumbsup:

Thanks !

Denzil

23-05-2020, 08:48

If you block one of the ports it will lower the tuning frequency (stuff something in tight, like some socks). I modelled the 15" Monitor gold in your enclosure and it looks like you will get either a large peak at the tuning frequency, or a dip in the midbass area. It's impossible to know without measurements. If you stuff a port (or two) and find the bass heavy sound is gone then all is good, but if you find you also lose midbass then the enclosure is too big.

I'd also experiment with removing the material on the shelf. For ports to work efficiently, you want a free passage from the driver to the ports. Another thing I'd do is lightly fill the whole section below the ports to reduce standing waves (assuming you can). Polyester stuffing would do the job.

Yes, this is actually a work in progress. I was luck to finish building the cabinets just before lockdowns, etc. However whatever further experimental work I was to do has now come to a standstill. I was to remove the port pipes to check how it would sound like as a simple Aperiodic cabinet (with vents but no port tuning). And also as you suggested, check what it sounds like with no shelf felt, to work like a simple ported cabnet. But I haven't had the opportunity to do that due to Covid restrictions. They are heavy, difficult cabinets to handle without sufficient help. I tried what you suggested, plugging one, two and all three ports. The bass reduces but the overall sound quality deteriorated a lot even with one port closed. I'm not sure why. It appears that these speakers really need to breathe. But once I experiment with removing the felt on the shelf. And also later with removing the tuning tubes, I'll let you know my observations. BTW, I'm a complete novice ! I did a couple of months of reading before I decided on this design. But I have no experience with speaker cabinet making whatsoever. I'll try and experiment with all you have suggested, post Covid 19 !

Thanks again for your feedback. Much appreciated.

Denzil

Denzil

23-05-2020, 08:50

This work exemplifies just how an individual as opposed to a mass producing company can pay much attention to the build quality of the cabinet and its damping. It would be prohibitively expensive for a company, and it also allows individual aesthetic choice.

That's true. They also need to consider size and weight when designing because of shipping costs going off the scale.

Regards,

Denzil

Denzil

23-05-2020, 08:52

Denzil

23-05-2020, 08:57

Lovely, nice choice of cloth. Nice doggies too.

Hahaha :p

Papa Dee

23-05-2020, 09:27

As already stated..very little chance of hating them.I love them just for the sheer thought and effort that went into making them.You knew exactly what you wanted and luckily had the skill and resources to make your dream come true..well done..congrats..Dee

Denzil

23-05-2020, 09:39

hornucopia

23-05-2020, 09:55

I like the picture where one of the guys is INSIDE the box!

killie99

23-05-2020, 10:00

Denzil

23-05-2020, 10:14

I like the picture where one of the guys is INSIDE the box!

:)

fatmarley

23-05-2020, 10:16

Yes, this is actually a work in progress. I was luck to finish building the cabinets just before lockdowns, etc. However whatever further experimental work I was to do has now come to a standstill. I was to remove the port pipes to check how it would sound like as a simple Aperiodic cabinet (with vents but no port tuning). And also as you suggested, check what it sounds like with no shelf felt, to work like a simple ported cabnet. But I haven't had the opportunity to do that due to Covid restrictions. They are heavy, difficult cabinets to handle without sufficient help. I tried what you suggested, plugging one, two and all three ports. The bass reduces but the overall sound quality deteriorated a lot even with one port closed. I'm not sure why. It appears that these speakers really need to breathe. But once I experiment with removing the felt on the shelf. And also later with removing the tuning tubes, I'll let you know my observations. BTW, I'm a complete novice ! I did a couple of months of reading before I decided on this design. But I have no experience with speaker cabinet making whatsoever. I'll try and experiment with all you have suggested, post Covid 19 !

Thanks again for your feedback. Much appreciated.

Denzil

It's well worth experimenting, but it's very difficult to know what's going on without modelling and measuring, as well as listening.

Here's a graph showing the Monitor Gold 15 in a 172ltr ported enclosure. The grey line is with 3 ports 3" diameter x 5" long, the black line is with 2 ports. As you can see you lose a bit in the all important 60hz to 100hz region when you block a port.

https://i.imgur.com/O865vXR.jpg

Here's the 172ltr enclosure again with the 3 ports (grey line again), The Black line is 116ltr but with only two ports (if you don't block a port the peak just moves up in frequency). You still have the all important 60hz to 200hz but that nasty peak at 40hz is gone.

https://i.imgur.com/HYI0foB.jpg

I can also model aperiodic, but It's only really any good for a high Q driver in a sealed enclosure that needs the bass peak reducing.

Denzil

23-05-2020, 10:19

Curious how long it took them to make them. I'm guessing in the UK it would take someone several weeks and probably cost north of £5k for the carpenters time plus the material - not even going to hazard a guess as to how much a lump of teak that size would cost in the UK!

It took us around 60 days from start to finish. We actually used two logs of teak. When we started cutting the log you see in the picture into planks, we found the centre of the log (the hollo core of the trunk of the tree) bigger than expected. So I had to but a second log, not as big as the first one.

Denzil

fatmarley

23-05-2020, 10:25

Ok, scrub that lol - Aperiodic seems to work very well at reducing the peak with the ported Tannoy.

https://i.imgur.com/sRPYdcB.jpg

Denzil

23-05-2020, 10:37

It's well worth experimenting, but it's very difficult to know what's going on without modelling and measuring, as well as listening.

Here's a graph showing the Monitor Gold 15 in a 172ltr ported enclosure. The grey line is with 3 ports 3" diameter x 5" long, the black line is with 2 ports. As you can see you lose a bit in the all important 60hz to 100hz region when you block a port.

https://i.imgur.com/O865vXR.jpg

Here's the 172ltr enclosure again with the 3 ports (grey line again), The Black line is 116ltr but with only two ports (if you don't block a port the peak just moves up in frequency). You still have the all important 60hz to 200hz but that nasty peak at 40hz is gone.

https://i.imgur.com/HYI0foB.jpg

I can also model aperiodic, but It's only really any good for a high Q driver in a sealed enclosure that needs the bass peak reducing.

Thanks, that's very interesting. My cabinets are 255 ltrs (net) minus the cones/cage, braces ports. The three ports are 4 inches in diameter and 10.5 inches long. According to my calculations, that's tuned to 29 Hz. However what confusions the Aperiodic shelf has caused is unknown to me until I experiment further. Apparently Aperiodic enclosures can't be ported and tuned. They just need a large shallow vent. I sadly have no measuring equipment.

Denzil

fatmarley

23-05-2020, 11:22

Thanks, that's very interesting. My cabinets are 255 ltrs (net) minus the cones/cage, braces ports. The three ports are 4 inches in diameter and 10.5 inches long. According to my calculations, that's tuned to 29 Hz. However what confusions the Aperiodic shelf has caused is unknown to me until I experiment further. Apparently Aperiodic enclosures can't be ported and tuned. They just need a large shallow vent. I sadly have no measuring equipment.

Denzil

Yes, that what my software says too (29hz).

Just so you know, my aperiodic simulation was just a ported box but with a very leaky enclosure. I can't simulate what will happen when you put an aperiodic vent in between the driver and ports.

Puffin

23-05-2020, 11:48

Denzil

23-05-2020, 14:41

Yes, that what my software says too (29hz).

Just so you know, my aperiodic simulation was just a ported box but with a very leaky enclosure. I can't simulate what will happen when you put an aperiodic vent in between the driver and ports.

Thanks again. You are so kind. So, since this is really a kind of hybrid which I have made it appears that there is no proper way of simulating an exact graph. And the only way is for me to conduct the experiments which you have suggested and which I had planned to do. In due course I'll also see if I can find someone locally who has measuring equipment. In the meanwhile, do you know of anyone or any manufacturer who has tuned, ported aperiodic cabinets ?

Denzil

23-05-2020, 14:47

Outstanding! They look superb.

I built some back loaded horn cabs years ago which took either a Fostex full range or Lowther PM6C. A very complicated build with loads of internal bits. I built them out of Birch Ply. My local timber yard were happy to cut all the bits to size from the plans which arrived mostly to spec. Once built they weighed 140lbs and I had to lift them myself of the bench....many times. Took about 6 weeks of evenings and weekends. Hard work, but very satisfying to have made something yourself.....and they didn't look too shit either:lol:

That's amazing ! I wasn't brave enough to build back loaded horns. There have been some who have built Westminster Royal copy cabinets for their MG 15's. They are very complex and if they are made of solid wood, would be impossible to move !!! Would love to see photos of the cabinets you built:)

fatmarley

23-05-2020, 17:10

In the meanwhile, do you know of anyone or any manufacturer who has tuned, ported aperiodic cabinets ?

No I don't I'm afraid. It's a quite an unusual design.

When you design a speaker you model the low frequency response before you build the cabinets, and then design the crossover. If someone gave me my own diy speaker drivers with crossovers, but no enclosure details, It would be incredibly difficult to for me to design the correct enclosure for them. It's so much easier to adjust the frequency response of the crossover, rather than make lots of different cabinets. I realise Tannoy are a bit different because there are official plans out there endorsed by Tannoy, but it still seems a bit hit-and-miss.

Denzil

23-05-2020, 17:32

No I don't I'm afraid. It's a quite an unusual design.

When you design a speaker you model the low frequency response before you build the cabinets, and then design the crossover. If someone gave me my own diy speaker drivers with crossovers, but no enclosure details, It would be incredibly difficult to for me to design the correct enclosure for them. It's so much easier to adjust the frequency response of the crossover, rather than make lots of different cabinets. I realise Tannoy are a bit different because there are official plans out there endorsed by Tannoy, but it still seems a bit hit-and-miss.

Yes, I understand. Thanks again for all your help Matt ! Whenever Covid 19 permits, I'll open the cabinets and start experimenting. Will keep you posted.

Kind regards,

Denzil

fatmarley

23-05-2020, 17:57

Yes, I understand. Thanks again for all your help Matt ! Whenever Covid 19 permits, I'll open the cabinets and start experimenting. Will keep you posted.

Kind regards,

Denzil

Yes, please keep us posted. It will be interesting to see how you get on. Can't remember if I said it before, but they look like they're fresh out of the Tannoy factory - Stunning!

SteveH1960

24-05-2020, 07:04

Excellent job, they look very impressive.

Sent from my iPhone using Tapatalk

Puffin

24-05-2020, 07:31

That's amazing ! I wasn't brave enough to build back loaded horns. There have been some who have built Westminster Royal copy cabinets for their MG 15's. They are very complex and if they are made of solid wood, would be impossible to move !!! Would love to see photos of the cabinets you built:)

There was a member on here some years ago who lived in Brighton who built Tannoy Autographs. Superb build.

https://theartofsound.net/forum/showthread.php?24450-Tannoy-Autograph-Build/page2&highlight=DIY+Westminsters

Here is a pic of my horns.

https://i.imgur.com/SAmQAsB.jpg

https://i.imgur.com/4Eytstg.jpg

Denzil

24-05-2020, 11:33

There was a member on here some years ago who lived in Brighton who built Tannoy Autographs. Superb build.

https://theartofsound.net/forum/showthread.php?24450-Tannoy-Autograph-Build/page2&highlight=DIY+Westminsters

Here is a pic of my horns.

https://i.imgur.com/SAmQAsB.jpg

https://i.imgur.com/4Eytstg.jpg

Wow. Really very nice. Superb finish ! And the Westminster cabinets are also great. Thanks for sharing !

Denzil

Denzil

24-05-2020, 11:34

Excellent job, they look very impressive.

Sent from my iPhone using Tapatalk

Thanks Steve !

Denzil

archiesdad

24-05-2020, 15:10

Really nice job.

Denzil

24-05-2020, 18:02

Yes, please keep us posted. It will be interesting to see how you get on. Can't remember if I said it before, but they look like they're fresh out of the Tannoy factory - Stunning!

Coming from YOU, that's a huge complement. Thank you !!!

hornucopia

24-05-2020, 18:12

That'd be Simon Mears, who now makes speakers (and stuff) full-time.

Denzil

24-05-2020, 19:22

That'd be Simon Mears, who now makes speakers (and stuff) full-time.

Wow. I just found his website.

http://simonmearsaudio.com/tannoy.html

Denzil

fatmarley

25-05-2020, 07:12

Ok, scrub that lol - Aperiodic seems to work very well at reducing the peak with the ported Tannoy.

https://i.imgur.com/sRPYdcB.jpg

Sorry for quoting my old post, but something occurred to me. If there's a way you could loosen the back panel? (maybe it's screwed on?). Just loose enough, so the enclosure isn't airtight any more. It would be a quick and easy way to see if aperiodic helps reduce your bass problem.

walpurgis

25-05-2020, 07:38

Teased out long fibre wool is good for bass damping, just don't obstruct the ports.

Jac Hawk

25-05-2020, 07:57

A job well done indeed and fitting that you've stuck to the classic look of Tannoy speakers and not gone off on a tangent so to speak, they must weigh an absolute tonne!!

fatmarley

25-05-2020, 08:19

Teased out long fibre wool is good for bass damping, just don't obstruct the ports.

Yes - it's a shame Monacor don't sell MDM-3 anymore (75% wool). It was good because it held its shape better than wool on its own, and it didn't compress easily. Although I've been looking at wool, toy stuffing material that looks like it could be a good replacement.

walpurgis

25-05-2020, 08:27

Yes - it's a shame Monacor don't sell MDM-3 anymore (75% wool). It was good because it held its shape better than wool on its own, and it didn't compress easily. Although I've been looking at wool, toy stuffing material that looks like it could be a good replacement.

I'm looking at a roll of that right now. It's been waiting on a shelf for a project :).

Wool should be used pretty loose, putting it in mesh bags in the main cabinet volume works.

fatmarley

25-05-2020, 08:45

I'm looking at a roll of that right now. It's been waiting on a shelf for a project :).

Hurry up and get building then :)

Wool should be used pretty loose, putting it in mesh bags in the main cabinet volume works.

Yes I should imagine it does, and it would make it easier to keep it away from the ports. Just don't make the mistake I did and stuff a load of fibreglass into tights, It compresses it too much (I hate fibreglass).

walpurgis

25-05-2020, 08:50

(I hate fibreglass).

I never use it. Nasty stuff.

Denzil

25-05-2020, 09:53

Denzil

25-05-2020, 09:57

Teased out long fibre wool is good for bass damping, just don't obstruct the ports.

Is that poly wool? Not sure what long fibre wool is.

Thanks.

Denzil

walpurgis

25-05-2020, 10:01

Is that poly wool? Not sure what long fibre wool is.

Thanks.

Denzil

It is literally long natural wool. (washed and clean obviously :))

There's a place here that specialises in it: https://www.woollyshepherd.co.uk/acoustic-wool-loudspeaker-kits/

Although I'm sure you can obtain it locally and probably cheaper.

Denzil

25-05-2020, 10:01

Hurry up and get building then :)

Yes I should imagine it does, and it would make it easier to keep it away from the ports. Just don't make the mistake I did and stuff a load of fibreglass into tights, It compresses it too much (I hate fibreglass).

Are you talking about glass wool or fiberglass. There's a difference. I used rock wool for lining my cabinets.

Denzil

Denzil

25-05-2020, 10:05

I'm looking at a roll of that right now. It's been waiting on a shelf for a project :).

Wool should be used pretty loose, putting it in mesh bags in the main cabinet volume works.

There's a difference between poly wool and sheep wool. And fiberglass and glass wool (the modern substitute for glass wool is rock wool). None of all this should be confused because they all have different properties and work differently in cabinets.

Regards,

Denzil

walpurgis

25-05-2020, 10:10

There's a difference between poly wool and sheep wool. And fiberglass and glass wool (the modern substitute for glass wool is rock wool). None of all this should be confused because they all have different properties and work differently in cabinets.

Regards,

Denzil

I know. I've been designing and building speakers (with varying degrees of success :)) for fifty years.

fatmarley

25-05-2020, 10:25

just don't obstruct the ports.

That's why I'm not keen on the idea of an aperiodic shelf in between the driver and ports. I know it's not the same as directly blocking a port but there's something about it that doesn't sit right with me. The way I see it, it's slowing down air movement through the cabinet, and then through the port.

Denzil

25-05-2020, 10:40

It is literally long natural wool. (washed and clean obviously :))

There's a place here that specialises in it: https://www.woollyshepherd.co.uk/acoustic-wool-loudspeaker-kits/

Although I'm sure you can obtain it locally and probably cheaper.

Yes, that's sheep wool, excellent for speaker damping. I'm sure I could obtain some local sheep wool here. However I would be reluctant to use sheep wool here because in tropical conditions, wool tends to be eaten by some mite if not constantly attended to which is not possible inside a speaker cabinet.

Denzil

Denzil

25-05-2020, 10:43

That's why I'm not keen on the idea of an aperiodic shelf in between the driver and ports. I know it's not the same as directly blocking a port but there's something about it that doesn't sit right with me. The way I see it, it's slowing down air movement through the cabinet, and then through the port.

Yes, I agree Matt. I'll take the felt off the shelf and check what it sounds like with just the ports as soon as I can.

Regards,

Denzil

Macca

25-05-2020, 11:04

Yes, that's sheep wool, excellent for speaker damping. I'm sure I could obtain some local sheep wool here. However I would be reluctant to use sheep wool here because in tropical conditions, wool tends to be eaten by some mite if not constantly attended to which is not possible inside a speaker cabinet.

Denzil

yes, I can see how you'd get a whole ecosystem developing inside the cabinets within a short space of time. Not ideal.

walpurgis

25-05-2020, 11:13

wool tends to be eaten by some mite if not constantly attended to which is not possible inside a speaker cabinet.

Denzil

Ah. I can see that would be a problem.

Sherwood

25-05-2020, 11:42

Ah. I can see that would be a problem.

A friend of mine in Gaborone, Botswana had a problem with geckos in a pair of ported speakers. He solved the problem by getting some cats but not before the offending creatures had left a sizeable guano deposit. :)

Denzil

25-05-2020, 11:56

yes, I can see how you'd get a whole ecosystem developing inside the cabinets within a short space of time. Not ideal.

:grouphug:

Denzil

25-05-2020, 11:59

A friend of mine in Gaborone, Botswana had a problem with geckos in a pair of ported speakers. He solved the problem by getting some cats but not before the offending creatures had left a sizeable guano deposit. :)

Hahaha. That's small game. A couple of years ago I had a leopard in the forest just behind my compound wall:mad:

Pharos

25-05-2020, 12:07

BAF wadding.

fatmarley

25-05-2020, 15:51

Yes, I agree Matt. I'll take the felt off the shelf and check what it sounds like with just the ports as soon as I can.

Regards,

Denzil

It'll be interesting to hear what happens. There's a chance that it will sound worse without the felt, but it's worth a try. I would also try it in combination with the loose baffle, and I'd definitely loosely fill the lower section to reduce standing waves.

Denzil

25-05-2020, 16:52

BAF wadding.

Is polyester based ?

walpurgis

25-05-2020, 16:57

Is polyester based ?

No. Different polymers.

Denzil

25-05-2020, 20:05

No. Different polymers.

Ah. Okay, thanks.

Denzil

hornucopia

25-05-2020, 20:24

....and I thought spiders inside my Ocellia Calliopes was a problem!

Pharos

25-05-2020, 21:34

Bonded Acetate Fibre - ATC use it.

Denzil

26-05-2020, 11:36

....and I thought spiders inside my Ocellia Calliopes was a problem!

:eek:

Denzil

26-05-2020, 11:36

Bonded Acetate Fibre - ATC use it.

Ah. Okay. Thanks.

Swann36

10-06-2020, 05:42

This is a great thread, i'm sorry to say that i've nothing of a technical nature to add, as yet i haven't built any speaker cabinets but i'm reading and learning lots as it is an ambition of mine to do so ..

thank you to all those that are contributing and of course Denzil for sharing his stunning cabinets .. now all stay safe & well

Denzil

12-06-2020, 12:59

Denzil

12-06-2020, 13:03

Thank you everyone for all your views, advice and inputs. I'm sorry I haven't been able to respond individually to all because the response has been so overwhelming. But many thanks to all who contributed here. I still have to open the cabinets to experiment some more. I'll keep everyone posted when that happens.

Regards,

Denzil

Denzil

13-06-2020, 09:02

I know. I've been designing and building speakers (with varying degrees of success :)) for fifty years.

Just saw this :eek:

So sorry.

Denzil

Denzil

13-06-2020, 09:21

Sorry for quoting my old post, but something occurred to me. If there's a way you could loosen the back panel? (maybe it's screwed on?). Just loose enough, so the enclosure isn't airtight any more. It would be a quick and easy way to see if aperiodic helps reduce your bass problem.

Hi again Matt,

I should have the opportunity to open the cabinets this coming weekend. I can't remove the ports at the moment because that's complicated. So the ports will remain 10.5 inches long.

I have the following options :

1. Remove the felt from the aperiodic shelf.
2. Stuff glass wool at the bottom (please see photo), I can add the glass wool in the bottom most chamber only. Or add glass wool in the bottom most chamber plus some more above that, up to the level of the ports.
3. I could do both things, remove the felt and add the glass wool to whatever level you suggest.

Please let me know what you think will work best.

Looking forward to hearing from you.

Regards,

Denzil

https://i.postimg.cc/MKb6bCgy/171-B9117-8362-4512-AE49-AC3448-F52-CBF.jpg (https://postimg.cc/QHCZjy8t)

fatmarley

15-06-2020, 10:11

Hi again Matt,

I should have the opportunity to open the cabinets this coming weekend. I can't remove the ports at the moment because that's complicated. So the ports will remain 10.5 inches long.

I have the following options :

1. Remove the felt from the aperiodic shelf.
2. Stuff glass wool at the bottom (please see photo), I can add the glass wool in the bottom most chamber only. Or add glass wool in the bottom most chamber plus some more above that, up to the level of the ports.
3. I could do both things, remove the felt and add the glass wool to whatever level you suggest.

Please let me know what you think will work best.

Looking forward to hearing from you.

Regards,

Denzil

https://i.postimg.cc/MKb6bCgy/171-B9117-8362-4512-AE49-AC3448-F52-CBF.jpg (https://postimg.cc/QHCZjy8t)

Hi Denzil,

As I said before, I can't model the felt on the shelf in software, so I don't know exactly what it's doing to the sound, but I don't like the thought of it slowing down the air. Everything I've read about ported speakers said there should be nothing in between the driver and the port that could impede the air. I'd remove it as an experiment, but there's a chance they will sound better with it (I think unlikely if everything else in optimised).

I'd definitely fill the lower section and above with glass wool (keep it loose), but keep it a few inches below the ports to be safe. Also, remove the felt on the shelf and then loosen the back panel. You may have to experiment with how loose you have the panel, obviously the looser it is, the more aperiodic, and the more it should reduce the bass hump.

If you like the sound with a loose back panel, but would like it to be a bit more professional, you can buy Scanspeak aperiodic vents (Not cheap (https://www.madisoundspeakerstore.com/flares/ports/vents/scanspeak-290001-aperiodic-vent-ssv/)). Or you could buy some vent grills and make some yourself.

Denzil

15-06-2020, 16:30

Hi Denzil,

As I said before, I can't model the felt on the shelf in software, so I don't know exactly what it's doing to the sound, but I don't like the thought of it slowing down the air. Everything I've read about ported speakers said there should be nothing in between the driver and the port that could impede the air. I'd remove it as an experiment, but there's a chance they will sound better with it (I think unlikely if everything else in optimised).

I'd definitely fill the lower section and above with glass wool (keep it loose), but keep it a few inches below the ports to be safe. Also, remove the felt on the shelf and then loosen the back panel. You may have to experiment with how loose you have the panel, obviously the looser it is, the more aperiodic, and the more it should reduce the bass hump.

If you like the sound with a loose back panel, but would like it to be a bit more professional, you can buy Scanspeak aperiodic vents (Not cheap (https://www.madisoundspeakerstore.com/flares/ports/vents/scanspeak-290001-aperiodic-vent-ssv/)). Or you could buy some vent grills and make some yourself.

Thanks Matt !

I'll start with removing the felt and filling up the bottom with glass wool and take it from there. Hopefully I'll do this sometimes this week.

Will keep you posted.

Thanks again.

Denzil

Denzil

15-06-2020, 16:41

Volume is 155 ltrs (net) excluding bracing, speaker cone and cage, ports etc. Total is around 165 ltrs.

Gosh, I just saw this typo. It's 255 ltrs, not 155 ltrs.

Denzil

Denzil

15-06-2020, 16:43

Nice looking speakers !!
What’s the volume size of the cabinet ?

255 ltrs. Not 155. That was a typo. Sorry.

Denzil

15-06-2020, 16:51

Hi Denzil,

As I said before, I can't model the felt on the shelf in software, so I don't know exactly what it's doing to the sound, but I don't like the thought of it slowing down the air. Everything I've read about ported speakers said there should be nothing in between the driver and the port that could impede the air. I'd remove it as an experiment, but there's a chance they will sound better with it (I think unlikely if everything else in optimised).

I'd definitely fill the lower section and above with glass wool (keep it loose), but keep it a few inches below the ports to be safe. Also, remove the felt on the shelf and then loosen the back panel. You may have to experiment with how loose you have the panel, obviously the looser it is, the more aperiodic, and the more it should reduce the bass hump.

If you like the sound with a loose back panel, but would like it to be a bit more professional, you can buy Scanspeak aperiodic vents (Not cheap (https://www.madisoundspeakerstore.com/flares/ports/vents/scanspeak-290001-aperiodic-vent-ssv/)). Or you could buy some vent grills and make some yourself.

I've just gone through the whole thread again and realised that I mentioned somewhere that the volume is 165 ltrs. That's a typo. It's actually 255 ltrs.

So sorry.

Denzil

fatmarley

15-06-2020, 17:11

I've just gone through the whole thread again and realised that I mentioned somewhere that the volume is 165 ltrs. That's a typo. It's actually 255 ltrs.

So sorry.

Denzil

That's no problem, It just looks like your peak at the tuning frequency is nearer 30hz, rather than 40hz.

Macca

15-06-2020, 22:40

Hi Denzil,

As I said before, I can't model the felt on the shelf in software, so I don't know exactly what it's doing to the sound, but I don't like the thought of it slowing down the air. Everything I've read about ported speakers said there should be nothing in between the driver and the port that could impede the air. I'd remove it as an experiment, but there's a chance they will sound better with it (I think unlikely if everything else in optimised).

I'd definitely fill the lower section and above with glass wool (keep it loose), but keep it a few inches below the ports to be safe. Also, remove the felt on the shelf and then loosen the back panel. You may have to experiment with how loose you have the panel, obviously the looser it is, the more aperiodic, and the more it should reduce the bass hump.

If you like the sound with a loose back panel, but would like it to be a bit more professional, you can buy Scanspeak aperiodic vents (Not cheap (https://www.madisoundspeakerstore.com/flares/ports/vents/scanspeak-290001-aperiodic-vent-ssv/)). Or you could buy some vent grills and make some yourself.

I agree. I'd take out that shelf and see how it works just as a ported design. As it is it is trying to do two separate types of bass reinforcement at the same time. Not to say that won't work it's just likely to be sub-optimal.

fatmarley

16-06-2020, 06:05

This is what I get with a 255ltr enclosure with 3 x 4" x 10" ports. Grey line is just ported, black line is still ported, but with a leaky enclosure (aperiodic).

https://i.imgur.com/HqC18BU.jpg

Denzil

16-06-2020, 09:47

This is what I get with a 255ltr enclosure with 3 x 4" x 10" ports. Grey line is just ported, black line is still ported, but with a leaky enclosure (aperiodic).

https://i.imgur.com/HqC18BU.jpg

Thanks so much Matt,

I'll work on taking the felt off and filling the bottom with glass wool. It's difficult to work on these cabinets. Each weights 143 kgs.

Regards,

Denzil

Denzil

16-06-2020, 09:49

I agree. I'd take out that shelf and see how it works just as a ported design. As it is it is trying to do two separate types of bass reinforcement at the same time. Not to say that won't work it's just likely to be sub-optimal.

Yes, I'll experiment with taking the felt off the shelf and filling the bottom with glass wool.

Will keep you posted.

Thanks Macca !

Denzil

Denzil

17-06-2020, 14:50

Thanks so much Matt,

I'll work on taking the felt off and filling the bottom with glass wool. It's difficult to work on these cabinets. Each weights 143 kgs.

Regards,

Denzil

Hi Matt and Macca,

So I opened them up today and took off the felt from the aperiodic shelf and loosely filled the bottom with glass wool.

https://i.postimg.cc/LXgP9s93/B2-CBC5-D1-2-BDD-4-B50-B295-9-EAA07847111.jpg (https://postimg.cc/2bmyTrB1)

https://i.postimg.cc/PryCkDbk/726577-EA-F05-B-43-A5-A8-EA-2429284345-B3.jpg (https://postimg.cc/XpZjfpD2)

Here's what happened. If at all there was a boom earlier, it went away. However, along with it what disappeared is the lower end bass which I could feel in my chest. Also what happened is that the soundstage became much less impressive, there's a flatness now, the 3 D has gone. The depth has vanished. I'm not sure why all this happened. Because of taking away the aperiodic shelf ? Or was it because of filling the bottom with glass wool, or both ? I'm not really sure. But I know I need to get back to how they were earlier. I could experiment by putting the aperiodic shelf back and keeping the glass wool there. However it's very difficult working with these monsters, just moving 143 kgs is tough (with limited help due to Covid). So for now, sometime this week, I'm going to put the aperiodic shelf back and take the glass wool out. What I would like to do at a later stage (when I have more help) is keep the aperiodic shelf and reduce the port length to around 3 inches (so the ports are not tuned), making them more or less typical Lockwood aperiodic shelf cabinets.

But I'm glad I did what I did today. It was a worthwhile experiment.

I'll let you know when I experiment further but I think that may be a couple of weeks from now.

Thanks again for all your suggestions.

Regards,

Denzil

fatmarley

17-06-2020, 15:28

Here's what happened. If at all there was a boom earlier, it went away. However, along with it what disappeared is the lower end bass which I could feel in my chest. Also what happened is that the soundstage became much less impressive, there's a flatness now, the 3 D has gone. The depth has vanished. I'm not sure why all this happened. Because of taking away the aperiodic shelf ? Or was it because of filling the bottom with glass wool, or both ? I'm not really sure. But I know I need to get back to how they were earlier. I could experiment by putting the aperiodic shelf back and keeping the glass wool there. However it's very difficult working with these monsters, just moving 143 kgs is tough (with limited help due to Covid). So for now, sometime this week, I'm going to put the aperiodic shelf back and take the glass wool out. What I would like to do at a later stage (when I have more help) is keep the aperiodic shelf and reduce the port length to around 3 inches (so the ports are not tuned), making them more or less typical Lockwood aperiodic shelf cabinets.

But I'm glad I did what I did today. It was a worthwhile experiment.

I'll let you know when I experiment further but I think that may be a couple of weeks from now.

Thanks again for all your suggestions.

Regards,

Denzil

Well, that wasn't what I expected to happen :)

It looks like I'm going to have to get my measuring gear out and do some experiments....

topoxforddoc

17-06-2020, 16:07

Denzil

17-06-2020, 17:17

Well, that wasn't what I expected to happen :)

It looks like I'm going to have to get my measuring gear out and do some experiments....

I too was surprised Matt,

I thought there would be more bass but it's less, at least at the lower frequencies (at the point where you can't hear it but start to feel it). Also I think the bass was tighter, with a little more punch and better defined with the aperiodic shelf. However I do believe that there was some amount of boom with my earlier configuration which has reduced. Also, if you go by measuring equipment, it's possible that the new configuration may actually show up as being better. But there seems to be a bit of a loss of that typical Tannoy sound now. They still sound great and better than the original Lancaster cabinets but the dramatic soundstage and depth and the deep lower bass has reduced. I'm toying with the idea of leaving the bottom most part of the glasswool when I put the aperiodic shelf back which may reduce the boom but bring back all the other elements. What do you think ? Does glass wool absorb bass ? Does it reduce bass if there's too much of it ?

Also, do you have any idea what the specifications of the felt of the original Lockwood cabinets was ? In terms of thickness and air resistance ?

Regards,

Denzil

Denzil

17-06-2020, 17:36

Denzil,
Can I ask why they sound like in the initial new cabinet incarnation? Did you like the sound, or did you feel that something wasn't right? If they sounded good in your room, then why not just put it back to the mark 1 new cabinet configuration?
Charlie

Hi Charlie,

First of all, I'm a complete novice and experimenting. When I first built the cabinets, they were meant to be tuned, ported bass reflex cabinets. Then I suddenly decided to add an aperiodic shelf. But I still kept the ports in place which are tuned to 29Hz. So I ended up with hybrid cabinets and needed to experiment further to check it they would work better as simple bass reflex or as aperiodic shelf cabinets. As of now it appears that they work better as aperiodic shelf cabinets. However the ports are still tuned to 29 Hz, and aperiodic speakers don't have tuned ports. Eventually I would like to do another test with the aperiodic shelf in place and shorten the ports to around 3 inches so they are not tuned anymore. Then they will be pure aperiodic cabinets.

Hopefully, at some point I will come to some conclusion depending on what sounds best. This is a work in progress:)

Regards,

Denzil

Puffin

17-06-2020, 17:52

What an interesting thread this is. Hat off to you Denzil for all the work you are putting in to tune them. Just think of the muscle mass you will be gaining in the process:D

fatmarley

17-06-2020, 18:09

I'm toying with the idea of leaving the bottom most part of the glasswool when I put the aperiodic shelf back which may reduce the boom but bring back all the other elements. What do you think ? Does glass wool absorb bass ? Does it reduce bass if there's too much of it ?

Also, do you have any idea what the specifications of the felt of the original Lockwood cabinets was ? In terms of thickness and air resistance ?

Regards,

Denzil

The glass wool in the bottom will reduce standing waves, and should reduce the boomy sound you often get with ported speakers. I've always preferred it with the speakers I've built (cleaner lows), but your Tannoys are tuned a lot lower than the speakers I've built in the past, and maybe that makes a difference. I really don't know.

There are studies that have been done with enclosure stuffing, but it's still a bit of a black art.

Sorry I don't know what the felt specs are that Lockwood used.

fatmarley

17-06-2020, 18:18

Eventually I would like to do another test with the aperiodic shelf in place and shorten the ports to around 3 inches so they are not tuned anymore. Then they will be pure aperiodic cabinets.

If the ports are actually working like conventional ports at the moment (when the aperiodic shelf is in place). Reducing the port length will raise the tuning frequency. Even if there's just a hole in the enclosure it will act like a port. I know this as a fact, not just because of theory, but because I removed my ports once and all it did was raise the tuning frequency. But maybe they aren't working like that with the aperiodic shelf in place?

I'd be interested to know what they sound like with the port lengths reduced, but combined with the aperiodic shelf removed too.

Macca

17-06-2020, 18:20

Denzil

17-06-2020, 21:32

What an interesting thread this is. Hat off to you Denzil for all the work you are putting in to tune them. Just think of the muscle mass you will be gaining in the process:D

Hahaha, yes ! I'm puffin all the way:)

Denzil

17-06-2020, 21:37

The glass wool in the bottom will reduce standing waves, and should reduce the boomy sound you often get with ported speakers. I've always preferred it with the speakers I've built (cleaner lows), but your Tannoys are tuned a lot lower than the speakers I've built in the past, and maybe that makes a difference. I really don't know.

There are studies that have been done with enclosure stuffing, but it's still a bit of a black art.

Sorry I don't know what the felt specs are that Lockwood used.

Yes Matt,

I do believe the boom has reduced, which is great ! So I'm going to keep the rock wool in the lower section once I put the aperiodic shelf back.

Denzil

Denzil

17-06-2020, 21:43

If the ports are actually working like conventional ports at the moment (when the aperiodic shelf is in place). Reducing the port length will raise the tuning frequency. Even if there's just a hole in the enclosure it will act like a port. I know this as a fact, not just because of theory, but because I removed my ports once and all it did was raise the tuning frequency. But maybe they aren't working like that with the aperiodic shelf in place?

I'd be interested to know what they sound like with the port lengths reduced, but combined with the aperiodic shelf removed too.

Yes, I know that reducing port length will raise the tuning frequency. My gut feeling is that the ports are not really working as tuned ports with the aperiodic shelf in place. I think ports need a certain velocity, speed of air in order to work as tuned ports. With the aperiodic shelf the velocity will be reduced considerably and they will probably only act as vents.

Denzil

Denzil

17-06-2020, 21:52

Rather than shorten the ports try removing them altogether just leaving the holes, this will give a vent for the aperiodic loading to work with.

The stuffing is unlikely to have any effect on bass frequencies but you might as well leave it on the bottom there, won't do any harm.

Yes Macca, there's no point in having any length of port in a aperiodic cabinet. However the Tannoy York aperiodic shelf cabinets did have a shallow port which may only have been there for aesthetics. I will eventually remove the ports. Because they also reduce the volume of the cabinet unnecessarily. But I need help to remove the ports and with social distancing, that will have to wait.

I'm going to leave the rock wool in the lower section because I do believe it's reducing the boom.

Thanks,

Denzil

walpurgis

17-06-2020, 21:55

Denzil

17-06-2020, 22:12

You could experiment with temporarily blocking the ports. Some speakers work well with sealed boxes. You'd get a slower bass roll-off and possibly more extended bass at the cost of reflex reinforcement. If you can locate plastic document mailing tube stoppers the right size, try those. They can always be BluTacked in place.

I tried doing that, right in the beginning Geoff, blocked all three, two and one port. Nothing sounded right. The bass reduce considerably and the speakers sounded shallow, no depth.

Denzil

walpurgis

17-06-2020, 22:31

Denzil

18-06-2020, 05:53

Ah well. That could be because the drivers have a fair degree of self damping (powerful magnets and stiffish cone surrounds). I'm wondering if a resistive port might offer something? Goodmans did an ARU that worked that way, but for 12 inch drivers as I recall.

Yes Geoff, it's called an aperiodic port. In the case of Tannoy, they used a aperiodic shelf (with a resistive felt sheet on the shelf), which I had put in and then taken off. That's the topic of this disconnection which you may not have realised because of what we are calling it "aperiodic shelf)

Regards,

Denzil

struth

18-06-2020, 06:11

Used to be called variovents

Puffin

18-06-2020, 06:15

You could experiment with temporarily blocking the ports. Some speakers work well with sealed boxes. You'd get a slower bass roll-off and possibly more extended bass at the cost of reflex reinforcement. If you can locate plastic document mailing tube stoppers the right size, try those. They can always be BluTacked in place.

Reducing the air flow with drinking straws has been said to work quite well.

Pharos

18-06-2020, 08:32

I'm not at all clear about what any questioning or dilemma might be here on design decisions; what is the desired objective?

Drinking straws are useful as an after-thought, an amelioration a too high a Q alignment, using laminar frictional air losses against the increased surface area they provide, but a correctly designed system should not require any such, and this also applies to internal box damping.

Whilst a certain amount of internal wadding is required for preventing the reflection of mid range frequency energy around the inside, and ultimately out of the port, damping of the fundamental bass reflex resonance should not be necessary.

A definite 'path' for the high air velocity bass resonance energy should be present in the middle of the outer wall wadding.

Denzil

18-06-2020, 14:52

Matt and Macca !!! And everyone else watching this thread.

https://i.postimg.cc/BnMZMBFP/5-D43-ACD6-85-B7-4-F6-D-AB23-1-B2420-EEB3-F8.jpg (https://postimages.org/)

This is one of the most embarrassing moments of my life. I wasn't sure if I should just dig a hole and disappear or tell everyone the truth.

First the excuses. I worked for more than half a day with taking 143 kg speakers apart and putting them together again. When I finished it was late at night, actually early morning and I was exhausted ! Then I turned on everything to listen and was horrified to hear what it sounded like.

Today, I went to check everything and found one banan plug of the left speaker had somehow come off. My listening space is around 18 ft from the speakers so it's not as easy to tell from that distance.

I just fired up everything again and it sounds brilliant !!!

I will listen properly and give a full report but for now :

I needed to get this off my chest !!!

Denzil

fatmarley

18-06-2020, 16:52

Matt and Macca !!! And everyone else watching this thread.

This is one of the most embarrassing moments of my life. I wasn't sure if I should just dig a hole and disappear or tell everyone the truth.

First the excuses. I worked for more than half a day with taking 143 kg speakers apart and putting them together again. When I finished it was late at night, actually early morning and I was exhausted ! Then I turned on everything to listen and was horrified to hear what it sounded like.

Today, I went to check everything and found one banan plug of the left speaker had somehow come off. My listening space is around 18 ft from the speakers so it's not as easy to tell from that distance.

I just fired up everything again and it sounds brilliant !!!

I will listen properly and give a full report but for now :

I needed to get this off my chest !!!

Denzil

Lol!

We've all done it (or something similar) :)

Macca

18-06-2020, 17:29

I know I have.

Denzil

18-06-2020, 20:24

You are both very kind, Matt and Macca. And have been extremely helpful.

I'll listen to the speakers for a couple of days and let you know what I think has changed.

Thanks again !

Denzil

Edward

10-02-2021, 23:07

Hi Denzil,

Interested in hearing from you and where you landed up with your uber Tannoy project. Moksha achieved? :)

I dream of transplanting a pair of 385 HPDs into similar cabs you created.

E

tapid

11-02-2021, 08:42

Hope that leopard s not eaten him. Amazing project !

Puffin

11-02-2021, 12:15

Just looking back at the pics at the start of this thread and thinking.....wouldn't it be lovely to be able to swap my freezing garage for the "workshop" facility that Denzil has in Goa. I am trying to clean up and rejuvenate some old heatsinks for a new amp project. Spraying paint at -2 degrees and getting it to cure is....err...not easy, even with a 400w halogen work lamp right on top of them.

I suspect that quite a lot of perspiration was made during the wood cutting carried out for the Tannoy's, but that has got to be preferable to what we have at the moment. Ugh, oh yeah I just remembered....no travelling abroad at the moment!