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Thread: Speaker cabinet design

  1. #21
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,303
    I'm Ken.

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    I seem to remember a thread somewhere, with 15" Tannoys using a sand filled sandwich.

    The guy had scrap partition walling from a portacabin type of structure and used this, with the cavities filled with sand.

    Huge and VERY heavy, but said it worked well.

    I have built concrete speakers in the past that worked well, they were stolen/recovered a couple of times, the thieves just gave up and abandoned them, they were so heavy. I did investigate Lightweight concrete using Pumice stone and sourced a UK supplier for sacks of Pumice gravel at the time, but never progressed it.
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

  2. #22
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 240
    I'm Dennis.

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    Yes Geoff I agree with your point in post 16, the passive will have to have a high compliance.

    I have found that the join alone between two layers of MDF when done with PVA is a great reducer of excitability of self resonance, The two layers cannot transmit the energy easily through the PVA.

    The bi-layer with sand goes way back into the 50s, and surprisingly my new ADAM Gannas use this to pretty good effect, with a Perspex window to show the sand.

  3. #23
    Join Date: Dec 2015

    Location: vancouver

    Posts: 642
    I'm danilo.

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    reads like you might also have one of those computer cases with perspex sides and 'colourful' leds

    Tannoy featured twin layer 'dampened' (glue actually) enclosures for their DMT series of speakers.
    Stripper bars always had a few pairs suspended above their 'stages'
    My audio bits: Thorens / diy phono, CD/dvd player(s), diy pre, F6, Tannoy Golds in my boxes / my xovers, and of course all strung together with basic diy Wires
    Lots of Cd's, yet more audio files, a couple of hundred semi worn Lps.

  4. #24
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 240
    I'm Dennis.

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    Actually I loathe all forms of ostentation. Do you remember those jumping energy spectrum bar graphs some years ago?

    The sand windows are on the back at least, and ironically taped over with black tape on the inside to hide it by the manufacturers, who I suppose thought twice.

    I'm still rather unsure about the speakers though.

  5. #25
    Join Date: Apr 2011

    Location: cheltenham

    Posts: 261
    I'm matt.

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    Quote Originally Posted by RothwellAudio View Post
    Less easy to do but possibly very effective would be two layers of some something (MDF, chipboard, plywood etc) with a void between the two which can be filled with builder's expanding foam.
    Tried that on my last speaker build and made a right mess of it. An easier way might be to glue foam sheet In between two layers - This looks like It could work - LINK

  6. #26
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 26,212
    I'm Geoff.

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    Quote Originally Posted by fatmarley View Post
    Tried that on my last speaker build and made a right mess of it.
    I never make a mess of anything!
    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. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  7. #27
    Join Date: Oct 2016

    Location: Bolton, England

    Posts: 572
    I'm Andrew.

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    Quote Originally Posted by fatmarley View Post
    Tried that on my last speaker build and made a right mess of it. An easier way might be to glue foam sheet In between two layers - This looks like It could work - LINK
    Yes, some ideas sound good at the planning stage but start to come unstuck when it comes to implementing them. I once made a pair of speakers with double wall cabinets with a void which I filled with sand. It worked - kind of - but was a proper pain in the backside to do. I think the BBC's idea of using bitumen pads was an attempt to make small-scale manufacture a feasible option and avoid too much complexity in the construction of the cabinets.

  8. #28
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 33,900
    I'm Grant.

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    Q acoustic make double walled cabs. dunno how they do it but they are supposed to sound pretty good. A lot of work for the enthusiast tho
    Regards,
    Grant ....
    Sometimes incompetence is useful. It helps you keep an open mind.
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  9. #29
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 240
    I'm Dennis.

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    Possibly Andrew, but I would think weight reduction may also be a factor, don't forget that they move stuff around.

    BTW after last night's R2 blues programme with Paul Jones, I am very pleased with my ADAMs, the sound was (for FM), brilliant in clarity, perspective and balance; I will keep them.

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