For a long time now, I've had a single pair of Infinity IL-60s, which I used as my front left/right speakers. I've been using a B4+ as my subwoofer. I don't have a center and I didn't have any surround speakers, so basically, all I had was a 2.1 stereo system. The bass was perfect when it was just those. Today, I received a second pair of Infinity IL-60s and the bass has completely disappeared. The speakers are out of phase and I don't know what to do to keep them in phase with the fronts and with the B4+ all at the same time. Can anyone give me any advice? The B4+ is in the back of my room, opposite the front IL60s.