great vid Steve, now funny thing is I was planning one of these but couldn't decide how to go about it, then fate stepped in, I have a very large sub in the loft left there by one of the kids after they left (came across it while putting the decos back in the loft, tucked away behind a drum kit I hadn't seen it before) the sub is far to large as it is but maybe with something built like in the vid it might be possible to make good use of this sub. i may need to change the woofer as this one will be too large.