agree that 90% of the subs on the market are garbage. The interesting
thing is that this is the one area in audio where you really can do a
better job with DIY than you can buy at any price!
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DIY a sub? Most are active, often with feedback. Occasionaly with digital
amps, motion sensors, set up software, room response algorythims..........

Given a big enough cabinet I could generate bass in (almost) any room.
Getting a quart out of a pint pot.....that is not something even the most
"throw money at it" R&D of B&W etc. has been able to do.

I hates dem,..... nasty, fat, subses...... (with appologies to Gollum)