Felt or polythene covered fibre glass

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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?
 
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