Passive radiators

[Mat-Moo]

Anyone know of a source for these, except BK? After a 15" possibly to play with but not too much cash to throw at it.

[IronGiant]

One of these?
http://www.earthquakesound.com/slaps.htm
don't know of a UK supplier though

Or is this what you're really interested in

http://www.adireaudio.com/Files/PRApplications.PDF

Dave, back from a damp fortnight in Somerset.

[Mat-Moo]

Welcome back Reg.... Damn that Rock sub is a powerful peice of work!

But I was considering making a new cabinet with a passive rad to increase bottom end a bit (although my sofa is starting to fall to peices!)

Edit: Shiva sub plans look nice