[BuffaloBill]

"Simply connecting a subwoofer to existing main speaker (or amp) terminals is the worst possible way to do this. Everything scientific and acoustic about this method is wrong, from the additive delay issues, to the back EMF of the main speakers affecting the low frequency signal. However there are plenty of people who simply do not understand correctly integrated bass, and they will be reasonably happy simply sticking another box on to their system without regard to timing, phase and frequency issues, and they will think it sounds “ok” or “good” and for those people it does not really matter."

"But back to our home / HI-FI / 2-channel / Audiophile / Surround Sound systems: There is only one truly correct way to “add a subwoofer” to a system in a controlled listening room situation: you must correctly cross over the two sealed cabinets (in the frequency domain) ; and their timing (the phase domain) must be correct. Any other method will lessen the focus and clarity you have tried so hard to preserve."