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Thread: My Devon Dilemma - the boxes are too small

  1. #1
    Join Date: Nov 2013

    Location: Bournemouth, UK

    Posts: 6
    I'm Pete.

    Default My Devon Dilemma - the boxes are too small

    Newby here, so not sure of all the protocols yet, but here goes...

    I love most of the sound of my Tannoy Devons, but because of the small-ish cabinet, the tuning of it seems to coincide with the lounge's room resonances, so room-boom is prominent rather that true low bass. The problem is, to correct this with the lovely HPD315 drivers I have, I'd need to build boxes as big, if not larger than Cheviots, and that's just not going to be domestically acceptable, if you know what I mean.

    Anyway, my first dual-concentrics were a pair of Dorsets which I still have in storage (slightly larger boxes, 10" D-C with an ABR), and I was thinking that with a 10" driver, I could again make larger cabinets tuned low, in order to gain really satisfying bass, but they wouldn't need to be as big as an optimum cabinet for a 12.

    However, I don't like the sound of the plastic coned, ferrite magnetted 2528 drivers from the Dorsets as much as the HPDs - somehow just less tingly and delicate. Pursuing this route, I thought I could have them re-coned with paper 2558 cones, build some larger cabinets and end up with something similar to Caernarvons. Only thing with that is that 2558 cones are as rare as hen's teeth, and having this done by Lockwood will cost 285, which is a lot for what is essentially an experiment.

    Just wondered if anybody had any suggestions, possibly around improving the 2528 drivers' sound through crossover tweaks? Many thanks. Pete.

  2. #2
    Join Date: Sep 2009

    Location: Bournemouth

    Posts: 3,675
    I'm Dan.

    Default

    Welcome Pete.....

    We can headbang together im also in Bournemouth
    Main System: Musical Fidelity Electra 100 Amplifier & Musical Fidelity E50 Tuner & Pioneer PD S505 Precision CD Player & Marantz HD-270 Speakers + Linn Interconnects & Van Den Hul The Wind hybrid Speaker Cable
    Vinyl -
    Rega Planer 2 with Rega Britain Green 250 Tonearm & Upgraded Van Den Hul Oil Bearing & Ortofon Super OM-10 & Roksan R Mat 5.

    Second System:
    Technics - SU-C909U Pre Amplifier & SE-A909S Power Amplifier & Technics ST-GT 1000 Tuner & Yamaha CDX 860 RS CD player & Thorens TD-125 MK1 Turntable & SME 3009 Series 1 & Shure V15 Type II Cartridge & SME 2000 Plinth & Dali Zensor 1 Speakers.

    Night Radio / Bit of Fun System for beer money
    Pioneer SA 6300 Amp = Free & Pioneer PDS 703 CD Player & Pioneer F676 Tuner & Technics SB30 Mini Speakers 3.20 on ebay

    Testing
    Celestion Ditton 100

  3. #3
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 2,551
    I'm Alex.

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    My first Tannoy DC's were 12" Monitor Silvers in Chatsworth corner enclosures. I got these in the early 70's. Looked old fashioned to me, so I made some rectangular Chatsworth enclosures, not much difference in sound, but they looked more modern. I happened to have some Mordaunt Short MS 700 cabinets, these were quite a bit larger that either Chatsworth enclosures, put the 12" Silver DCs in these, and the resulting sound was really excellent.

    About 5 years ago I managed to buy a pair of Devons. The cabinets were rough, the surrounds had been replaced quite well apart from not looking 100% cosmetically due to a little bit of excessive glue on the cones. I noticed some distortion in the treble of one unit, re-centred the tweeter voice coil and all was well.

    I thought the bass a bit light, also slightly boomy. Adding a little extra damping inside the cabinets helped in tightening up the bass, but it's still a little light.

    The original Chatsworth corner enclosures are still here. It would be nice to try the HPD315s in these larger cabinets, although a bit larger that these would probably be even better.
    Last edited by spendorman; 21-12-2016 at 15:18. Reason: typo
    Spendorman

  4. #4
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 22,589
    I'm Geoff.

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    You can alter the port tuning on the Devon quite easily, to raise or lower the system resonance.

    The 2528 driver will accept the SRM 10B paper cone. This is a conversion I'm planning, as I have a pair of Ascots knocking about. The drive units will hopefully end up in transmission line cabinets.

    I don't see why a Cheviot sized box would be unacceptable for the HPD 315 units. Surely this would take up no more room than Devons on stands?

    I assume you use stands? If not, that would most likely be the cause of your room matching issues.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT/Swiss Idler jobs. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC, stepped attenuator or valve pre-amp/Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big and smaller dual concentric speakers and full range speakers, amongst others. And too much more to list!

  5. #5
    Join Date: Nov 2013

    Location: Bournemouth, UK

    Posts: 6
    I'm Pete.

    Default

    Quote Originally Posted by walpurgis View Post
    I don't see why a Cheviot sized box would be unacceptable for the HPD 315 units. Surely this would take up no more room than Devons on stands?
    Thanks Geoff. Yes, my Devons are on stands, but although the same depth, Cheviots are 2" wider. That's mainly what would make them "too imposing" within the lounge. I'll have a look at modelling what would happen if I changed the port length. I suspect I'm at the edge of the envelope as far as trying to gain more LF extension is concerned though, due to the small cabinet volume.

    For your conversion (2528 to 2558) do you have paper cones already? If so where can I get some?

    Cheers.

  6. #6
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 2,551
    I'm Alex.

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    The Chatsworth cabinet is not very wide.

    Have you tried blocking up the port completely?
    Spendorman

  7. #7
    Join Date: Nov 2013

    Location: Bournemouth, UK

    Posts: 6
    I'm Pete.

    Default

    Hi Alex, thanks. I've not tried blocking the port up, but I suppose it would be easy to try. An infinite baffle would theoretically give a faster bass roll-off, but more ultimate LF extension...

    I've just googled Chatsworth and they're the same width as Devons, so that's a possibility too.

  8. #8
    Join Date: Feb 2008

    Location: Middlesex, UK

    Posts: 2,551
    I'm Alex.

    Default

    Actually, I think the infinite baffle will give a slower roll off, will go down lower. But less output at upper bass frequencies.
    Spendorman

  9. #9
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 22,589
    I'm Geoff.

    Default

    Quote Originally Posted by Pete Alcock View Post
    For your conversion (2528 to 2558) do you have paper cones already? If so where can I get some?

    Cheers.
    I have some. They were an ebay purchase. It took me quite a while to find a pair though.

    Mine are mint, but second hand. They can be bought on ebay, at a price! You could contact the seller and ask if any used examples are available.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT/Swiss Idler jobs. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC, stepped attenuator or valve pre-amp/Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big and smaller dual concentric speakers and full range speakers, amongst others. And too much more to list!

  10. #10
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 22,589
    I'm Geoff.

    Default

    Quote Originally Posted by spendorman View Post
    Actually, I think the infinite baffle will give a slower roll off, will go down lower. But less output at upper bass frequencies.
    That's quite likely.
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT/Swiss Idler jobs. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC, stepped attenuator or valve pre-amp/Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big and smaller dual concentric speakers and full range speakers, amongst others. And too much more to list!

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