Best subwoofer for 2 channel Hi End system

1) Aerial SW 12
2) Revel B15
3) ML Descent
4) The other stuff
I listened to everything, and wanted the Aerial, but found the $1.5k premium over the Revel to be too much. So I ended up with two B15's.
If you think two is too much, then you don't know about bass nodes, or have a perfect room with lots of acoustical treatments.
Main speakers - ML SL-3's.

amp they use now. Very musical and an extremely powerful capability. No servo's needed here as distortion is quite low already. At 140 lbs quite heavy. VMPS has been getting great reviews on their bass since the eighties. Bass is typically articulate with natural weight but could be used for home theater too. For the money they are one of THE bargains in subs. One of the best benefits though is the advantage of being able to adjust bass "Q" to your room.

I would suggest the green mountain audio hammer. Better yet, two green mountain audio hammers.

I met Roy of Green mountain at the show and he is a hands on kind of guy. I have always had much respect for his work but after meeting him , the respect carries to the man as well.

I just picked up a Martin Logan Depth for my Aeris I. What a great Improvement over the Vel HGS-10.