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Magna Audio
25-10-2009, 21:14
Started my project - having heard a pals 18mm birch plywood ones (I should coco) I wanted some.
Firstly how would the HPD's stack up against the Golds I had heard in Mr coco's cabs?
Mr Coco helped with a calc program.
21mm would probably be better so that was that + 24mm for the front panel for good measure.

HPD's
http://inlinethumb28.webshots.com/27099/2069687690071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2069687690071997495KJtSZd)
http://inlinethumb46.webshots.com/35629/2772748440071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2772748440071997495bXCYFO)
http://inlinethumb54.webshots.com/42165/2452228190071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2452228190071997495wKGvDy)

Monitor golds
http://inlinethumb40.webshots.com/44007/2742499710071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2742499710071997495GnfGDP)
http://inlinethumb10.webshots.com/33289/2067589240071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2067589240071997495SgvoIp)

So all well and good on paper:)

Now for some specs and cutting sheets.

http://inlinethumb30.webshots.com/24541/2885941230071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2885941230071997495gxLRzb)

http://inlinethumb16.webshots.com/43663/2742211320071997495S600x600Q85.jpg[/
[URL=http://entertainment.webshots.com/photo/2479969770071997495rMOAFG]http://inlinethumb36.webshots.com/43235/2479969770071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2742211320071997495NoidAf)

Avon plywood did the business. Arrived in the week.
All nicely machined to 0.2mm and the mitres are perfect.

http://inlinethumb60.webshots.com/40699/2733908920071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2733908920071997495CqtGIJ)
http://inlinethumb58.webshots.com/42233/2383653430071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2383653430071997495MOzGPx)
http://inlinethumb51.webshots.com/43954/2289316190071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2289316190071997495oKFFUl)
http://inlinethumb18.webshots.com/40145/2526021290071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2526021290071997495vXWzRb)

They weigh in at er 55kgs each without drivers :gulp!


Will keep you updated on the progress.

Hope to have them ready in a couple of weeks (glue, screw etc) :gig:

aquapiranha
25-10-2009, 21:21
Excellent Steve, i look forward to seeing the end result! nothing quite as satisfying as listening to something you put together yourself.

:)

John
26-10-2009, 06:51
Good work Steve keep us posted with lots of Pictures
Ps there is something magical about big drivers!

Marco
26-10-2009, 08:45
What a superb project, Steve! Best of luck with it mate and keep us updated (as I know you will) with reports and pictures as you go through your journey :)

Marco.

Magna Audio
01-11-2009, 19:34
Loft finished the GRF's got some attention this weekend.

Lining it up
http://inlinethumb62.webshots.com/22397/2191446740071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2191446740071997495NzhMMy)

http://inlinethumb61.webshots.com/44540/2971909510071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2971909510071997495slUoZe)

http://inlinethumb27.webshots.com/42522/2510911300071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2510911300071997495UDqXoj)

Driver mounting plate
http://inlinethumb13.webshots.com/46284/2366806420071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2366806420071997495cazhfK)

http://inlinethumb52.webshots.com/45107/2032451810071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2032451810071997495Ulmxox)

http://inlinethumb24.webshots.com/44823/2503029020071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2503029020071997495RIXDNg)

Front panel in
http://inlinethumb43.webshots.com/43050/2873943500071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2873943500071997495GEEyvj)

Castors from wardrode
http://inlinethumb37.webshots.com/19364/2944591310071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2944591310071997495PFRKWy)

A few more evenings and the first one will be ready

anthonyTD
01-11-2009, 19:53
excelent workmanship steve,
well done so far, looking forward to the finnished article.
regards,anthony,TD...

Magna Audio
01-11-2009, 21:47
Here is how they will look (minus the hand) re-using the Berkeley's cover.
Quite like the dark Tannoy brown against the lighter wood (will be more mellow once vanished / polyurethaned)

http://inlinethumb40.webshots.com/45607/2150765250071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2150765250071997495GHCoXt)

Magna Audio
03-11-2009, 22:07
The 2nd one is coming along now. Had to start it as I am waiting for the felt to arrive - easiest to line the internal baffles without them all in.
Spending about 2-3hr per evening and weekends they are coming along apace.

Magna Audio
05-11-2009, 22:01
Starting to look like something

http://inlinethumb53.webshots.com/42740/2536106440071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2536106440071997495AwpQFd)

The one on the right is rubbed down and two thin coats of polyurethane
http://inlinethumb28.webshots.com/43995/2232609350071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2232609350071997495VuuCcD)

They are now named Bertha & Big Bob by the family?!
http://inlinethumb51.webshots.com/43634/2776244460071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2776244460071997495SPaTHW)

I am now waiting for the felt to arrive so have had time to cut the slots for the crossover panels and put the terminal posts on the backs.

Just 3 internal horn baffle and 2 reflector pieces in each speaker to go and transplanting the drivers etc over.
If I get the felt in time I reckon they will be playing on Sunday!

Marco
05-11-2009, 22:06
Hi Steve,

Very nice work, mate! :)

Somehow I think that these are going to hit the spot for you nicely :cool:

Wotcha putting in them - Reds or Golds?

Marco.

Magna Audio
05-11-2009, 22:19
At the moment my HPD's - They have as near as damn it the same characteristics according to the horn calc prog as the Golds - well see.
These are 21mm / 24mm birch as opposed to the all 18mm ones I have heard made to the same plan. Should be interesting to compare them.

Marco
05-11-2009, 22:33
I think that the new cabinets will improve your HPDs no end (in fact, I'm confident that they'll sound stunning), but in my experience Steve, HPDs have rather different sonic characteristics compared to Monitor Golds :)

Marco.

Ian Walker
05-11-2009, 22:47
I think that the new cabinets will improve your HPDs no end (in fact, I'm confident that they'll sound stunning), but in my experience Steve, HPDs have rather different sonic characteristics compared to Monitor Golds :)

Marco.

Yes agreed HPD's are better:)...........runs for cover.......................

Marco
05-11-2009, 23:08
Hahahaha... Aye, I remember you said that about the Devons! :eyebrows:

Marco.

Ian Walker
05-11-2009, 23:41
Hahahaha... Aye, I remember you said that about the Devons! :eyebrows:

Marco.

Er no i shed the devons are shite daftee :lol:

Marco
06-11-2009, 00:09
But they use HPDs, which you've said are better than MGs, you double daftee!! :ner: :lol:

Marco.

Ian Walker
06-11-2009, 00:17
Devons are toys silly:)

Marco
06-11-2009, 00:28
Indeed. I do like the bigger HPDs, and I'm sure that Steve's will sound ace in his new cabinets, but to my ears they're still quite a bit off of what a pair of 15" Reds or Golds (or the drive units in your Canterburys) would do in the same cabinets.

I'm sure that Steve knows this, too :)

Anyway, who cares - he'll still have a pair of speakers that will blow away most things made these days!

Marco.

Magna Audio
06-11-2009, 17:29
I am thinking the HPD's with that little extra bass response will suit the GRF's perfectly:)
Having lots a fun making them.

Working on bracing for rear most baffle and back panel now.

The felt arrived today so they will be cleared for landing this weekend... Quite a few hours work left though... One is now ready for driver

Boy are they getting nice and heavy and all the baffles really brace the cabs well. 21mm birch ply is a joy to work, not at all flappy / resonant and has a very nice smell.

aquapiranha
06-11-2009, 17:34
Looking great Steve, I bet you are over the moon when you finally get a listen. I have to agree, BBply is so much nicer than MDF. While building my OB's I used both, and the MDF is messy as hell and potentially dangerous to machine without protection. The baffles I made are a sandwich of 19MM BB ply and 19MM MDF so good and strong.

Keep the pictures coming too!

Ali Tait
06-11-2009, 18:19
At the moment my HPD's - They have as near as damn it the same characteristics according to the horn calc prog as the Golds - well see.
These are 21mm / 24mm birch as opposed to the all 18mm ones I have heard made to the same plan. Should be interesting to compare them.
Steve,I think you will see quite a difference for the better with the thicker cabs.

Magna Audio
07-11-2009, 20:54
YES!

As planned, here is the first one plumbed in and in place

http://inlinethumb30.webshots.com/16861/2796873460071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2796873460071997495objrsI)

Wife likes the colour at least... Taken in the colder daylight.

2nd one ready this evening

http://inlinethumb13.webshots.com/42956/2209054690071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2209054690071997495WFutfU)

All together

http://inlinethumb09.webshots.com/44936/2018053290071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2018053290071997495udxfqW)

They are playing as I type.
What can I say about these speakers then.

Firstly they were a bit of a shock. Different tonal balance and very open.
Loads of deeeeeeep bass. Not boomy or out of control just deeper than the Berkeleys could muster.
Mid and treble they are quite laid back. Went to level one on the treble on crossover - all speakers should have this facility:)

There is plently of detail and depth.
Effortless and instruments sound more like instruments. That timbre / resonating clarity you should get with music.

The Berkeleys are good - these cabs just take what the drivers are capable of to another level.

Must shut up and listen now.

RotaryConnection
07-11-2009, 21:24
Can I just say that they look bloody lovely?
Nice work.

Ian Walker
07-11-2009, 21:27
They look bloody stunning,nice work Steve.

Alex_UK
07-11-2009, 21:32
What they said - top work Steve!

Marco
07-11-2009, 21:45
Looking shooooooooperb, Steve - very nice work!

I think you've got some fun times ahead ;)

Marco.

Jonboy
07-11-2009, 22:57
Theres nothing like a big cabinet to get the best out of your Tannoys, spent some time today listening to Westminster SE's now they are a large cabinet with very good manners, Tannoys are nearly the best, but still prefer my stacked 57's in my world of Hifi and thats coming from a fellow Tannoy owner :ner:

Marco
07-11-2009, 23:09
Hi Jon,

Ian had a pair of One Thing Audio modified stacked 57s - he loved them, as did I, but big Tannoys driven by a top-notch valve amp are a different ball game altogether. It depends what you're after I suppose.

I certainly wouldn't swap my Lockwoods for a pair of stacked 57s, and I suspect neither would Ian swap his Canterburys for some.

What stacked 57s do well (the 'electrostatic thing'), there are few equals, but for me, they put all their eggs into the one basket, as it were, and simply aren't versatile enough for my hugely varied taste in music and/or the sort of levels I like to listen at sometimes.

We're all different though, thank goodness, as it'd be a boring world otherwise! :cool:

Marco.

Rare Bird
07-11-2009, 23:43
Steve:
They look great but can i ask why the drivers are mounted behind the main baffle board & not on it main or is this something to do with the design of maybe gonna fit bigger units?

Tell me to shurrup if you want.

Marco: Not even a stack of 57's like these

:eyebrows:

Marco
07-11-2009, 23:48
LOL, neat picture! I'd like to have heard what that sounded like...

Marco.

The Grand Wazoo
08-11-2009, 00:21
Marco, you need the HQD system like what that Wazzle geezer said over there---------
http://theartofsound.net/forum/showthread.php?p=78154#post78154
Post no. 6

.....and that Barry bloke said here...........http://theartofsound.net/forum/showthread.php?t=4235
.................stacked Quads and 24" woofers. That'll do it me old mucker!!

Marco
08-11-2009, 00:35
Dat'd be DISCO, daddy-o! :eyebrows:

Marco.

The Grand Wazoo
08-11-2009, 00:40
........and I didn't even mention the ribbon tweeters!
I reckon they'd satisfy most folks, don't you?

Magna Audio
08-11-2009, 09:22
Steve:
They look great but can i ask why the drivers are mounted behind the main baffle board & not on it main or is this something to do with the design of maybe gonna fit bigger units?

Tell me to shurrup if you want.

Marco: Not even a stack of 57's like these

:eyebrows:

The front panel just has a hole to allow the drivers to recess. Bonded to that is the retaining panel that the driver fits to. That way you can have flush grills the recess looks right and you get double thickness attached to the sides and top. 45mm of birch ply is a nice front baffle thickness.

Took these in the daylight

http://inlinethumb26.webshots.com/44057/2542953190071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2542953190071997495gMfYyd)

http://inlinethumb51.webshots.com/30578/2993246080071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2993246080071997495IqXkaW)

They make the 37" plasma look too small.

Thanks for all the positive comments and encouragement BTW. I've really enjoyed this project.

Next year the hifi room project ;)

John
08-11-2009, 09:32
Great work Steve I imagine you are just enjoying the music

anthonyTD
08-11-2009, 12:07
great job steve,
if they sound as good as they look then you have a very fine pair of speakers there!:smoking:
regards,anthony,TD...
PS, after living with big tannoys for a while now, it would be very hard for me to go back to what i was used to before, their very addictive.:)

Marco
08-11-2009, 12:13
Aren't they just! :eyebrows:

Glad your Glenairs seem to be doing the biz now :)

Would you be up for taking them to Scalford Hall in March to be part of the AoS system if my Lockwoods don't make it?

Marco.

anthonyTD
08-11-2009, 12:22
Aren't they just! :eyebrows:

Glad your Glenairs seem to be doing the biz now :)

Would you be up for taking them to Scalford Hall in March to be part of the AoS system if my Lockwoods don't make it?

Marco.
no way!!!
if i was to move these[thats a big if] because of their beautifull and delicate cabinet finnish, the only way would be to put them back into their original boxes, then you have the equivilent to two large fridge freezers!!!:lolsign:
A...

Marco
08-11-2009, 12:34
Haha, just testing...! ;)

Marco.

anthonyTD
08-11-2009, 12:37
marco,
i would be up for bringing my SP1's though.
and maybe a soul amp!
A...

Ali Tait
08-11-2009, 13:26
Cracking job Steve!

Marco
08-11-2009, 13:52
marco,
i would be up for bringing my SP1's though.
and maybe a soul amp!


Cool. Well there's no reason why they couldn't be used in the system at some point :cool:

I was just checking the 'Tannoy situation', as it were, in case I can't get the Lockwoods down. However, I'm 95% sure it'll be ok.

Perhaps Steve would consider bringing his new babies? I'd love to hear them :)

Marco.

The Vinyl Adventure
08-11-2009, 13:53
Yea, most impresive! I wish I was more capable with wood than I am!

Jonboy
08-11-2009, 20:53
I lucky enough to run two systems, one with Tannoys and valve amp, the other with the 57's and valve amplification, each do there own thing but i always enjoy the size of the sound stage with the stats which have now got Piezo horn tweeters mounted in between, pictures to follow, they still look like shit but who cares, I must admit that i spent some time yesterday listening to a top notch system which had Westminster's hanging onto a pair of Audionote Kegons fitted with Western Electric 300b's, the vinal source was a Blue pearl turntable fitted with a Grayham Phantom arm and a My sonic MC cartridge, it sounded like the keetle drum on Beethovens 9th was in the room with you and i'm not realy a classical music fan, big Tannoys MMMM but out of my price range thats for sure, i nearly put a deposit on a pair when i saw had a email from the lottery saying that i was a winner on the Euro millions, turns out i have won Ģ5.68 oh well:lol:

Magna Audio
08-11-2009, 22:53
Cool. Well there's no reason why they couldn't be used in the system at some point :cool:

I was just checking the 'Tannoy situation', as it were, in case I can't get the Lockwoods down. However, I'm 95% sure it'll be ok.

Perhaps Steve would consider bringing his new babies? I'd love to hear them :)

Marco.

I think the answer would be the same - too big, too heavy, too easy to damage. I used a ramp to get them up the step from integral garage to utility and then wheeled them to the lounge - lifting would be a two man job.

Marco
08-11-2009, 22:56
You lot are no fun! :lol:

Marco.

Magna Audio
09-11-2009, 11:14
Plenty of fun in own lounge;)

Mr Coco was over yesterday and said this of my GRF's

"Popped over to Steve's today and heard these. I can confirm that they really do sounds as good as they look, and they do look very good indeed, especially up close.

Even though it's a rather different system, they're definitely recognisable as GRFs, sounding similar to mine. Perhaps not quite as laid back as my pair which have Golds and flimsier cabinets, these really get up and boogie.

The best thing about these is the upper-bass/lower mid. There is so much fundamental musical information there and so many speakers get it wrong, where these get it just right."

We did some loudness tests and I can conclude that they go much louder without any problems (like they are cruising) over the Berkeleys (stiffer cabs?). The GRF's just get on with.

I am well chuffed.

Magna Audio
10-11-2009, 13:14
Right, Tonight was a classics night.
I'm not much into classical music on hifi - for good reason, until now I have not really heard it reproduced right. I like it live but hifi classical has always left me a bit uninvolved.

These GRF's are amazing on classical music - whole new insight very much like being in a small/medium sized concert hall listening. The timbre and presentation of the strings, esp cello's is fantastic. It's something you have to hear to believe.
The Berkeleys could never do this - scale / volume of sound is the biggest area of difference.
Gives concert hall like reproduction. Now I am really getting the whole 9 yards (I mean 15").
Must find more classical on vinyl...

Marco
10-11-2009, 19:30
Great news, Steve. I'm really pleased for ya :)

I agree with your observations - 15" Tannoys make 'real' musical instruments come alive with (nearly) all the scale and intensity they achieve when played in a live performance.

Just like you discovered this with classical music, it's the exact same with jazz, too. Saxophones, trumpets, piano; whatever - they all sound so bloody real!

Marco.

anthonyTD
10-11-2009, 20:39
good to hear that all that hard work has paid off!:)
regards,anthony,TD...

Magna Audio
13-11-2009, 13:38
Yeah.

I've experimented further adding an extra bracing piece to the lower part of the rear panel.
Based on that, as I have loads of spare quality Birch ply I am going to double skin the rear panel (will be 42mm thick) to further reduce rear wall / possible resonance issues. - Might as well as the ply is cluttering up the garage.

Be interesting to see the effects.

Magna Audio
15-11-2009, 18:28
The extra rear panels certainly did not hurt.

Taking almost as long as one speaker this weekend it was speakers covers time.

Wife chose the cloth colour. She does not like the drivers showing really :nup: :nuts:

First the frame surrounds (wood came from Wickes clearance bin at 0.99p)

http://inlinethumb16.webshots.com/34575/2995734220071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2995734220071997495yujmtB)

Next some stretching & stapling

http://inlinethumb29.webshots.com/19356/2947072260071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2947072260071997495HKBTuV)

One done

http://inlinethumb59.webshots.com/39098/2861376390071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2861376390071997495HLuGXM)

Then to mount them. I have ordered Wilmslow speaker grill lugs but decided not to wait (can always swap to the Wilmslow). I used 3/8" oak dowel for the pegs, mounted into the covers surrounds, sloted for a sprung fit into 3/8" holes carefully drilled into the front panels. That way there are no black mounting dowels on the fronts...

And the result

http://inlinethumb12.webshots.com/45387/2649812870071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2649812870071997495CuHCSt)

http://inlinethumb02.webshots.com/46273/2847353560071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2847353560071997495vMMyPr)

Next some GRF badges to finish them off...

Been listening to more and more stuff over the week / weekend - still amazingly good speakers. These are keepers!

Mike
15-11-2009, 20:17
Woha!.... Nice job! :eek:

Marco
15-11-2009, 20:23
Very classy, Steve! :)

Maybe just some clear (matt) varnish or wax to finish off the wood surfaces?

Anyway, respect to your good lady for, erm, 'allowing' you to grace the family lounge with 'proper-sized' speakers :smoking:

Message to all downtrodden WAF victims: see, it can be done! ;)

Marco.

Mike
15-11-2009, 20:26
Message to all downtrodden WAF victims: see, it can be done! ;)


Oh yeah?... paint em a fetching shade of 'baboons arse' red and see what happens! :lol:

Marco
15-11-2009, 20:33
Hehehe... I like your big 'reddies' (ahem!), and your good lady also comes into the same category worthy of 'large speaka respect'. Your Yammies ain't exactly tiddlers! :eyebrows:

Marco.

Mike
15-11-2009, 20:48
She liked the sound pretty much right away, but the colour is still, erm, 'an issue'! :eyebrows:

Anyway... lets not clutter Steve's GRF thread, eh? ;)

Magna Audio
16-11-2009, 12:52
Very classy, Steve! :)

Maybe just some clear (matt) varnish or wax to finish off the wood surfaces?

Anyway, respect to your good lady for, erm, 'allowing' you to grace the family lounge with 'proper-sized' speakers :smoking:

Message to all downtrodden WAF victims: see, it can be done! ;)

Marco.

They are varnished in satin / rubbed down / varnished about 4 times.
I might very fine steel wool / wax em too as that will give them a hue that varnish alone cannot achieve.
They will mellow a bit over time but birch is pretty light which we like.

Wife now says full steam ahead for my own Hifi room extension - there is method to my madness:eyebrows:

A hifi pal came round on sat.
He was impressed - commented about needing a bigger room to get them to really sing as we suspect they can + he always enthuses about the vocals on the Tannoy's I have had.
He also said you could listen to these for hours... which I do.

Rare Bird
23-11-2009, 10:07
Steve:
I've found just the thing to finish those cabinets off

P.M.

Magna Audio
27-11-2009, 22:53
Badges arrived - duly fitted. Looks complete now.

http://inlinethumb17.webshots.com/37712/2977068870071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2977068870071997495QrgZoe)

Also noticed that mine were a bit boomy on some tracks compared to Mr Coco's - so went at them with some acoustic foam - hmm that's a lot better. Still deep and expansive but all under control as I want.

Job done.

Mike
29-11-2009, 16:45
Hmmm... can't really see the badges.

Do they look like this? http://cgi.ebay.co.uk/TANNOY-GRF-Engrave-Copper-Badges-SPEAKER-PAIR-BEAUTIFUL_W0QQitemZ370283070856QQcmdZViewItemQQptZ Vintage_Electronics_R2?hash=item5636974588

Magna Audio
29-11-2009, 22:05
Chose these instead.

http://cgi.ebay.co.uk/Tannoy-GRF-Badge-for-Tannoy-GRF-speakers-Box-Pair_W0QQitemZ150386065641QQcmdZViewItemQQptZVinta ge_Electronics_R2?hash=item2303b540e9#ht_896wt_116 6

Magna Audio
13-12-2009, 13:48
Last photo's on this build...

Made some castor hiding plinths and varnished them this morning. On carpet (my intended flooring for the music room) they just brush surface allowing the castors to do the wheeling for convenience but not leaving a noticeable gap.

http://inlinethumb27.webshots.com/45466/2941604490071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2941604490071997495rEYxvy)

http://inlinethumb26.webshots.com/1305/2028862060071997495S600x600Q85.jpg (http://entertainment.webshots.com/photo/2028862060071997495bxcmgX)

Marco
13-12-2009, 14:37
Looking good, Steve :)

Have you waxed the cabinets a bit more since we last spoke? They look a bit 'richer' in hue now.

Marco.

Magna Audio
13-12-2009, 17:42
Looking good, Steve :)

Have you waxed the cabinets a bit more since we last spoke? They look a bit 'richer' in hue now.

Marco.

They have had a good few coats of varnish and a good polishing too.
Time will mellow them. Not as much as pine but they will gain colour.

Jonboy
13-12-2009, 17:45
The plinth finishes them off a treat Steve

Graeme
06-01-2010, 17:32
Very nice indeed :)

Any ideas what would need to be altered to make a GRF for the 10" hpd's?

Magna Audio
09-01-2010, 17:36
I have seen 12" GRF's - Cab looked about the same size perhaps a little smaller.

Mr Coco did some simulations for 12" drivers and these indicated the cabs had to be scaled down a little to get optimum perf - don't know by how much though.

I don't know if 10" drivers would do the same GRF thing though.

Graeme
09-01-2010, 17:40
Its ok, ive found out how to build the tannoy cornetta's.

The english version is a rectangle grf, the japanese version is a corner cabinet.

Im going to build the rectangle version.

There is hardly any info out there about the cornetta's, its almost like they didnt exist. Tannoy dont even have any info about them!

They were designed for 10" golds but i dont think that will matter much.

They are exactly the same design as the bigger grf's but external dimensions are 34 3/4" x 18 1/2" x 16"

Graeme
09-01-2010, 17:42
On this plan of the GRF, what is the black teardrop shape? A cross brace?

Ive not seen it on any other GRF plans.

http://www.hilberink.nl/codehans/tannoy5.htm

Graeme
09-01-2010, 17:46
Looking again, the cornetta cabs are a bit different.

They are this design

http://www.hilberink.nl/codehans/tannoyh1.pdf

But tannoys list of speaker specs lists the cornetta as a bit wider.

Graeme
09-01-2010, 17:48
This is the tannoy data

http://www.hilberink.nl/tannoy/jpvanson/speakers.pdf


As the other dimensions are the same as the drawing i linked i guess the cornetta was that design of horn but 18.5" wide.

duo(2)
13-06-2010, 19:00
Hello,
im new here, but have read about the rectangular GRF cabs,
and i rather interrested in building some myself, i have a pair of HPD 385A in berkley cabs
but would like to have better bass,

there are some differenses in the measurements of the different Rec. GRF plans
some is 61 cm wide some is around 80 cm wide and some is 55 cmm wide...?
it confuses me:-)
can anyone help me with plans for building the Rec. GRFīs that would fit my HPD385A
preferably one that is max 61 cm wide

B regards Nikolaj DK.

aquapiranha
13-06-2010, 19:11
go to the bottom of this page, there are 3 links to plans for rectangular GRF's hope it helps.

http://44bx.com/tannoy/grf.html

May be something of interest on here too....

http://www.hilberink.nl/speaker.htm

Steve

Magna Audio
13-06-2010, 19:44
Welcome aboard the Tannoy GRF joyride.

Or as my wife affectionately called them Annoy with a silent T - she loves them really.

The ones I have been making are 610mm wide. Seems a nice size and they do work well. 3 other folk I've made them for love them too and numerous folk have heard them and praised them.
I've made 3 pairs with curved top and base front since the 1st mitre corner pair.

I would advise making the rear panel removeable so you can tune the bass with felt panels.

what material were you thinking of?

duo(2)
14-06-2010, 07:56
Welcome aboard the Tannoy GRF joyride.

Or as my wife affectionately called them Annoy with a silent T - she loves them really.

The ones I have been making are 610mm wide. Seems a nice size and they do work well. 3 other folk I've made them for love them too and numerous folk have heard them and praised them.
I've made 3 pairs with curved top and base front since the 1st mitre corner pair.

I would advise making the rear panel removeable so you can tune the bass with felt panels.

what material were you thinking of?
:) Annoy - silent T, funny:lol:

Hello Steve,

Yes i have been reading your treads on the differnt forums,
and itīs your historie that made me think about building the rec. Grfīs

Regarding material, i would build in Birch Ply- like you did

The with of 61 cm is it made to fit the Tannoy Units that you started out with, the DC 38xx series units ( it looks like 38xx DC series ? )
or the HPD385 ?

Best Regards Nikolaj

Ps. nice gear that you have - especially the SP10 :-)

Magna Audio
14-06-2010, 19:12
Yep the first pair had a big cutout hole for the 3828's. I subsequently made 3 pairs with a smaller cutout hole for the round HPD's.
I have a pair of HPD's fitted in those first cabs and they look and sound fine.

Yes the SP-10 was Mr Coco's from the Wam. I like the deck and when he decided to sell it I snapped it up after a home audition...
He now has a Voyd which is very good but nothing is perfect. The Slate / gunmetal arm board all seem to gel well with the SP-10... Others may disagree but I like it.

duo(2)
15-06-2010, 06:30
SpeedySteve, can have you to mail me the plans for the Rec Grf,s with the cut out to the hpd ? royalturntable@hotmail.com

i also use the sp10mkII but in the obsidian plinth and with a technics epa100 arm, itīs the best turntable that i have owned, and i have had alot of ttīs -
the last one before the sp10 was a TW acoustics raven one witch also is a really nice tt, but the Technics is ( in my opinion) better!

The Grand Wazoo
15-06-2010, 06:53
Hi Nikolaj,
Welcome to the Art of Sound.
The first-post police haven't got you yet, but they will! You should nip over to the Welcome area to introduce yourself to the general population to tell us all a little about yourself. Your system looks very interesting and I'm sure folks would like to see photos of it in the Gallery. I'm sure some people would be interested to hear about your pre-amp - the Bent Audio products are not well known here.

Ali Tait
15-06-2010, 09:42
Hi and welcome.How do you find the 845's?

duo(2)
15-06-2010, 11:01
Hi and welcome.How do you find the 845's?

Hello Ali,

itīs my first pair of 845 ampīs
and before i bougth them i god told by "experiend" hifi people, that the 845 was a rough sounding tube, and that i would miss the sweet tone of the 300bīs that i had before,
but in my opnion they have a nice sound, not at all rough, but controlled and with excellent bass , but - it all depends on witch tube brands you have installed - i use Chinese Shuguang 845c metal plates and TJ Full Music 300B ( mesh plate , keramic base and gold pins) Sylvania vt229, and raytheon 6sn7, and it works quite well togther,

But! im in the process of selling the cayin 9084d amps now, course i will try to build an amp myself ( a kit solloution :-))

Ali Tait
15-06-2010, 17:14
Yes different valves give different sounds.I used to have a Mr Liang 845,which with a few tweaks was a very good amp.