Sub for 2 channel music only setup

I do not agree at all with Stanwal's gross generalization of subs but I do endorse his recommendation of the REL "S" series for their easier integration with analog stereo systems.

Kal

Yes there is a difference. It might be worthwhile to check out ACI -- google "aci titan XL".

Agree with Stanwal and Kal on the REL. The REL is one of the only sub systems to use hi-level inputs from your main amp with no crossovers in the signal path of your main speakers. When set correctly, you only notice the presence of the sub when you turn it off - the extremely low bass disappears and the soundstage collapses. For best performance, it is critical to use one of Synergistic Research's Tesla Rel Spec cables for the hi-level connection.

Another vote for Rel. Personally I stay away from the 'R' series.
I recently upgraded the stock cable to a Nordost Baseline and that made a huge difference. I had no idea what I was missing

I have tried MANY subs, and finally tried a Rel (B1), and it's absolutely the best all around sub that I have had. It does 2 channel excellently, and with it's proprietary input options (both high and low level inputs at the same time) handles Home Theater like a champ.

I think the Vandersteen 2Wq was the best 2 channel sub as far as integration, but the Rel goes much deeper, and is just as fast.

The JL Audio F113 and Velodyne DD15 (with the SVS PC Ultra 13 right behind) were the best Home Theater subs I used, but they were limited on hook up options compared to the Rel's for 2 channel.

Rel is my recommendation, the higher up the food chain you can go, the better.