HI, I have a sub woofer from these , they sell to music shop's and i'm sure they could help.
regards Joe
http://www.bck.co.uk/
Have you gone into this site and clicked on the R.S 501 button . My in law has the technote subwoofer and I have this and all though slightly less powerfull it's sound is just as good. for £99 check it out.

[This message has been edited by rotty (edited 07-15-2005).]