Why not use a massive "C" structure instead of a basketShape it as a sphere (no sharp angles) while you're at it. Get rid of some of thems standing waves & feedback.
* Also, pls extend usable FR 120-22kHz, if possible, w/out a wizzer.
* Pls provide a +24T strength magnet (for wont of better matl, alnico is aceptable).
Cheers