Felt or polythene covered fibre glass

LostForWords · 23rd February 2010, 02:02 PM

Many years ago Ted Jordan introduced a full-range metal driver that was designed to be housed in a cabinet similar to that emplyed by the current JX92S. One of the original features was the lining adopted for the transmission-line, which employed polythene covered fibre glass (think of your hot water tank). He no longer seems to use this method nowadays and recommends felt or foam, but for many years other designers favoured types of wool for its absorbtion characteristics, when used in the compression chamber of speakers.

It is is hard to obtain pure woollen underlay, but Axminster carpets still stock a shoddy underlay that is primarily made from wool and jute. The drawback is that the fibres can easily work loose and might obstruct the voice coil gap!

Has anybody experimented with materials like clingfilm, polythene or such materials over underlay/felt to prevent such disasters and did it still absorb high frequencies?

BL21DE3 · 23rd February 2010, 02:32 PM

No experience with coating underlay/felt with cling film etc. but if your looking for pure wool underlay this online stockist has pure wool underlay (scroll to the bottom of the link) Felt and Wool Carpet Underlay from Carpets Direct (GB) Ltd for all your carpet underlay and accessory needs. I've been looking at using them for some underlay/felt to line my current speaker build.

Regards,
Ewan

el`Ol · 03:01 PM

Go to a saddle maker and ask for saddle felt.

LostForWords · 24th February 2010, 07:33 AM

Thank you for the help. I am delighted to learn about the pure wool felt, which looks excellent and should not lose too many fibres!

23rd February 2010, 02:02 PM	#1
LostForWords diyAudio Member Join Date: Feb 2010 Location: London	Felt or polythene covered fibre glass Many years ago Ted Jordan introduced a full-range metal driver that was designed to be housed in a cabinet similar to that emplyed by the current JX92S. One of the original features was the lining adopted for the transmission-line, which employed polythene covered fibre glass (think of your hot water tank). He no longer seems to use this method nowadays and recommends felt or foam, but for many years other designers favoured types of wool for its absorbtion characteristics, when used in the compression chamber of speakers. It is is hard to obtain pure woollen underlay, but Axminster carpets still stock a shoddy underlay that is primarily made from wool and jute. The drawback is that the fibres can easily work loose and might obstruct the voice coil gap! Has anybody experimented with materials like clingfilm, polythene or such materials over underlay/felt to prevent such disasters and did it still absorb high frequencies?

23rd February 2010, 02:58 PM	#3
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	Go to a saddle maker and ask for saddle felt. Last edited by el`Ol; 23rd February 2010 at 03:01 PM.

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23rd February 2010, 02:32 PM	#2
BL21DE3 diyAudio Member Join Date: May 2004 Location: Saffron Walden	No experience with coating underlay/felt with cling film etc. but if your looking for pure wool underlay this online stockist has pure wool underlay (scroll to the bottom of the link) Felt and Wool Carpet Underlay from Carpets Direct (GB) Ltd for all your carpet underlay and accessory needs. I've been looking at using them for some underlay/felt to line my current speaker build. Regards, Ewan

24th February 2010, 07:33 AM	#4
LostForWords diyAudio Member Join Date: Feb 2010 Location: London	Thank you for the help. I am delighted to learn about the pure wool felt, which looks excellent and should not lose too many fibres!

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