Quote:
Originally Posted by Cajundaddy
Yes, you can do this but you may not like the result for a couple of reasons:
- Mixing speaker-out level and active sub-in line level may result in hum or other issues.
- Everything below 150hz is omnidirectional so if multiple rooms with multiple subs are active, you may get acoustic phase cancellation (no bass at all in some rooms).
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He will be using subs that get their input from a speaker pass-thru, so he won't be needing to do any line-level stuff. Which will save a bit of wiring, too!
Most modern active subs have a phase reverse switch, so careful placement and use of the switch will almost always be enough to reduce the phase problems. Time alignment problems, maybe not. But it's a house, not a recording studio. He'll be fine.
My $.02
