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Thread: Black Open Cell Foam for TL port Mouths?

  1. #1
    Join Date: Sep 2012

    Location: East Anglia UK

    Posts: 1,163
    I'm Marc.

    Default Black Open Cell Foam for TL port Mouths?

    The stuff in the back of my PMCs is way shot, and I've recently been tweaking with a pair of Castle Chesters, which have (had) the same stuff in the port mouth (which was also on it's way out), just starts crumbling to dust.

    Black, open cell and prone to decomposition - and seemingly commonly used by TL speaker makers.

    Does anyone one where to get fresh supplies?
    Last edited by Rothchild; 18-12-2016 at 09:49.

  2. #2
    Join Date: May 2012

    Location: Dagenham Essex

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    I'm I'mteachingmarcotheartofpishanto.

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    Music , fills the gaps between silence !

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  3. #3
    Join Date: Sep 2012

    Location: East Anglia UK

    Posts: 1,163
    I'm Marc.


  4. #4
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 24,631
    I'm Geoff.

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    Look on ebay for industrial filters.

    You may need larger, but it's this sort of thing: http://www.ebay.co.uk/itm/2X-Carbon-...3D291709689561

    The stuff was called 'Declon' and was first popularised for speakers by JBL I believe, who made the front grilles for the L100 Century model from it around 1970.
    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!

  5. #5
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 32,149
    I'm Grant.

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    Stuff you want is Class '0' Acoustic Foam Studio Treatment 6mm. I got mine in a big roll
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  6. #6
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 24,631
    I'm Geoff.

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    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. #7
    Join Date: Sep 2012

    Location: East Anglia UK

    Posts: 1,163
    I'm Marc.

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    Thanks all,

    The sump foam is the one that looks closest to the original (which is handy as it's cheaper than anything designated 'studio' or 'acoustic' ;-))

  8. #8
    Join Date: Dec 2015

    Location: vancouver

    Posts: 605
    I'm danilo.

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    Given the erm.. biodegrable nature of the oem Airfilter foam material.
    Possibly might consider an alternate material fitment?
    http://www.homedepot.com/p/UltraTouc...6482/202710055
    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.

  9. #9
    Join Date: Sep 2012

    Location: East Anglia UK

    Posts: 1,163
    I'm Marc.

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    Quote Originally Posted by danilo View Post
    Given the erm.. biodegrable nature of the oem Airfilter foam material.
    Possibly might consider an alternate material fitment?
    http://www.homedepot.com/p/UltraTouc...6482/202710055
    Thanks danilo, that's not the right stuff for this purpose, I probably would use it for pipe tuning / box stuffing but the stuff I'm after is really just there to stop children and animals having access to the pipe.

  10. #10
    Join Date: Feb 2011

    Location: Red Rose Country

    Posts: 115
    I'm Colin.

    Default Reticulated Foam

    The actual foam material you need is called RETICULATED FOAM. It likely comes under several Trade Names.

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