Hello salevick! For classical music, one is fine. For more ooomph in pipe organ music, percussion, etc. two is obviously better. The big reason for one per channel is home theater use. Crashes, alien approaches, creatures in the bushes sneaking up on you are better since a creature menacing from the left side should not have heavy footsteps thudding from the center of the room. Many TV documentaries and nature programs (BBC stuff in particular, PBS series also) have marvelous multi-channel soundtracks. I have five systems in the home and I have 9 subwoofers. Keep Smiling!
