You can obtain satisfactory results with one sub, but to achieve really great integration you also you need; lots of time, and a way to equalize and tailor the bass frequency response to correlate to your listening position. I have found great results by using an old Velodyne SMS 1 Sub equalizer. It allows you to hook up a monitor and has a long enough microphone cable to setup at your listening position to achieve exceptional results. By adjusting EQ parameters on the Velodyne EQ, you can see in real time what effect your settings will have at the listening position displayed on the monitor. It is easy to use if you under stand crossover settings, slope, phase, -+20db settings for frequencies of 20-120hz, and a few other settings that I forget. It does allow up to two subs to be hooked up.
Single vs. Dual Subs
It's common wisdom that dual or multiple subs help smooth out bass response in different spots in the room, but what about for a dedicated listening room with a fixed single listening position? What do two subs add to the music presentation that a single dialed in sub is missing provided that single sub is dialed in perfectly for the listening position?
Caveat: not interested in the SWARM method or multiple subs at the moment, strictly comparing single to dual subs
Caveat: not interested in the SWARM method or multiple subs at the moment, strictly comparing single to dual subs