I have a copy but it is not freely available online. Bradbury, 'The use of fibrous materials in loudspeaker enclosures,' J.Audio Eng. A commonly recommended stuffing density is around 8g per litre.Īnother reference for the effects of fibre is by L. I still have a pack so I will do a comparison (see Part.2). The price of £1.60 per 100g (plus £4.95 delivery in UK) compares very well with Visaton lambs wool which I bought a while ago for another project, currently at £12.50 for 125g, said to be enough for 20 litres. Here in the UK we don't have that problem, here is an example of a source of wool products, World of Wool, which lists 35 different breeds of sheep together with their fibre size and length including Lincoln at 36-40 microns which would qualify as 'long fibre wool' and may be just what we need. Availability may in fact explain part of the problem, a paper sometimes quoted to compare different absorbents is Loudspeakers on Damped Pipes by G.L.Augspurger which fails to include the recommended long fibre wool in tests on the surprising grounds that 'bulk wool is not easy to find in the US'. There appears to be widespread dissent on this point, for example there was a slightly heated discussion at AudioKarma, but there is probably no need to worry too much whether wool has any advantage over polyester fibres, I have seen no suggestion that it could be worse, so if it is available there seems no good reason not to use long fibre wool. The Bailey article shows in Fig.4 the results of his comparison of different absorbent materials, suggesting a substantial improvement from the use of long fibre wool. The 1965 Wireless World article A non-resonant Loudspeaker Enclosure Design by A.R.Bailey is worth reading, there were several successful commercial designs based on this work, an example being the IMF TLS80, and a DIY variation is described in great detail in The Audio Amateur.
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