Hi, I am getting towards the final stages of building my first subwoofer - a 60 litre, dual-ported, 150W, 12 inch beast.... I have bought some "polyfill" polyester wool to stuff the box with - as recommended by hundreds of DIY subwoofer sites. Just on a whim last night I put a match to a small amount of the wool to see how well it burns - it caught light immediately and burned away happily when I droppped it into the toilet bowl! Do I need to be worried about stuffing my box with this? The amp I am using ( a 150W model manufactured by Acoustic Energy and sold here in Australia through Jaycar, similar store to Maplins) is not fully enclosed - the electronics are all bare at the rear of the plate. I am thinking, even if it did catch light... A. it would only happen whilst I was using the sub, as the amp powers down automatically when not in use - so hopefully I would notice!? B. the box, although vented, would probably not allow a fire to take hold. C. I should really get myself an electrical-fire extinguisher for the house anyway! Any thoughts? What do commerical subs get filled / lined with? Should I consider standard fibreglass roof insulation or similar lining, and forget about stuffing? Cheers, lhalha ...who is wondering how much it would cost to get an SVS into Australia, and whether I am saving any money at all in building this bloody thing myself....!