Sounds like a perfect use for Crowsons to me - there is zero impact on your neighbors, while your couch is exploding.Thanks for your reply. Well given that I'm in a small apartment and a single SVS SB12 with barely any response down to 20 Hz, not that I can really make full use of that given the circumstances, I assume a single Crowson is going blow my mind based on what I've read here.
I assume the Crowson effect will be isolated to the couch only and the ULF won't affect by neighbors - I ask, it's probably a stupid question but in my complex I have very strict rules and I have an old lady living next to me. Just want to make sure I'm safe in that regard.
I'd get 2 for the couch. As for amps, the NX amps are a lot cheaper, but if not in a different room (my Crowson amp is in the same room as the screen) they have very loud fans. After purchase, I discovered there is a "fan mod" that involves opening up the amp and making some changes - so I returned it and bought the (totally silent) D501. If you are good with opening up amps and making changes (and don't care about the warranty,) the NX amps can be an option.
I had Crowsons for a long time before I got a mini-DSP, and loved them. It's true that the mini-DSP (and a calibration by CallingMrBenzo and aron7awol) made the experience better, but if it were a choice of nothing or Crowsons without a mini-DSP, I'd still get the Crowsons.
After all, you can always upgrade/make the experience better, later.