Sorry for the long delay in responding. Blame it on that double-u O R K thing.
Yes - I live in Chicago - Downtown. My speaker builder is John Van L (Van L Speakerworks). Damn genius, this guy. I am going there Saturday 24 March to retrieve a pair of repaired speaker cables.
I've asked him to start on the amp-build (on-board) portion of a pair of bass towers for his 'Duet' speakers. The bass towers for these employ a pair of Canadian-manufactured 7" bass drivers. One is in a sealed enclosure and the other is vented. Both are active (no passive radiator - not that those are bad, or anything).
John seems sold on the digital amps provided by Bash which manufacture amps specifically intended for use as bass amps. He's got an incredible fine ear - no question. Says he's listened to other configurations and still stands by the digital choice. I have a pair of REL G-1 subs for my main system which employ on-board 700W A/B amps. These are wickedly fast, although I believe the drivers and other aspects of its design bring much to the quick response party. This is why I'm curious about other subwoofer amp designs/choices other than Class D. That said, I do have a lot of faith in John's designs as he's built the best pair of speakers (my bias, of course) in an over-the-top pair of his Quartets I got last year. If you know of John, ask him about them. There truly isn't anything like them.
By all means, please feel free to reach me offline @ firstname.lastname@example.org
I'll look forward to anything you can suggest.