I brought my carpet from a shop called discount autoparts which unlike their name dont sell discount autoparts if you know what I mean ? So what Im saying is that I payed more than I reckon I should have done, although it is proper accustic carpet. I think the roll was 2m long, I payed 25 quid for it and had exactly enough. I used a pva type glue to stick the carpet down and staple gunned the carpet to the inside of the box, I folled the carpet over the edges rather like a parcel instead of cutting it flush.
Im unsure how mine sounds yet as I have the nightmare of wiring it up left to do, this takes me ages because I love neat wires. From what I have heard they do sound better once they been run in abit, generally I think its best to avoid full throttle on the volume side for a while.
GusFree