Very Compact Subwoofer

Leedistad, No, I would not build these subs into a cabinet. I'll be using them standing alongside a pair of Eminent Technology LFT-VI speakers, which are wonderfully open and throw a big soundstage but need some low end augmentation. I would like to get the low end down to about 30 Hz realistically for such a small sub.

An Infraplanar sub would be ideal, but I don't want to spend tripple the entire system cost for a sub. Not going to put that kind of money into a second system.

I believe the ScanSpeak Revelator 23W-4557T ten inch diameter aluminum driver will work in a 1 cubic foot sealed enclosure. Contact Rick Craig of Selah Audio, as he's built subs for me with these drivers that are phenomenal for music.

Velodyne SPL800 - small, tight, powerful. I use two and love them.

The Von Schweikert vs-1 is a tad larger than 13". It is a great sub. Easy to set up, solid, phases well with electrostatics as well as regular speakers. Better than Martin Logan dynamo, snell, m&k and comparable to REL. IMHO.