OK, here's my story. I used to have the Gershman Acoustics X-1 & matching SW-1 passive sub driven by an Adcom GFA-5400 amp. I was very pleased with the X-1 speakers, but I always felt the SW-1 subs were a bit lacking. I found myself often times boosting up the bass on the pre-amp, but it never really sounded right. I say this in the past tense because I used to live in St. Bernard Parish, Louisiana, and during Hurricane Katrina, my audio equipment did not know how to swim very well in the 9 feet of water that inundated my home.
I have decided to repurchase the X-1 speakers for the main, but as for the amp and sub, I am inclined to get something better. I plan to only have 4 inputs into the system - a tuner, a laptop that will essentially be a WAV or MP3 player, another computer (very sparingly), and the TV. The amp will be driving only the main speakers, and the only requirement is that there be a remote so I can vary the volume at distance. The sub will be powered, so that it can have a loudness independent of the main speakers. I would also like to have the relative loudness for the sub controlled relatively easy (i.e., front), and of course, a remote control would be good as well. I would also prefer to get 2 smaller subs rather than one, as I think that the stereo effect would be better. I would be putting the subs on some type of a stand below the main speakers. I understand that there could be better placement in a corner, but I am constrained in the geometry. I could put the sub in the center between the mains as well. I would prefer the sub have lots of settings, as I don't really know what I would want until I actually set it up and start fiddling around with it.
So, I am looking for any recommendations for an amp or a sub. It seems as there are plenty of good amps, I shouldn't have a problem (I am considering Bryston.) But I don't know a thing about subs, and my experience with using a sub for computer speakers leaves me a bit cold. I don't want to get something that is so expensive that it is limited by the quality of the Gershman speakers. But I want it to fit well. The specs on the SW-1 (which was designed to go with the X-1) is that there is a pass frequency of 90 Hz, for what it is worth. I would prefer not to get the SW-1 as I wasn't super pleased by its performance (and it's passive in any case.)