There is some
REALLY good info on the Audioholics "System Set-up" pages that will help out. Maybe way more info than you want. They'll help you work out placement and explain calibration. It's a real "hands on" thing and a good way to learn about your system. As you'll find out, frequencies below 80 Hz are non-directional, but speaker placement (like corners) act as bass enhancement. This can create that "hot spot" effect I was talking about if one sub is in the corner and the other is not.
The main thing you will need to get started is a fairly cheap SPL meter. You can get an analog meter from Radio Shack for about $40. The other thing you need is a DVD or test signal source. There are plenty of good calibration DVD's available for your whole system that can walk you through the whole thing, including video, ie:
Digital Video Essentials or Avia: Guide to Home Theater. There is also a fairly simple audio calibration track on any THX Optimized DVD.
Your receiver has an automatic system for calibration, but this will not equalize the individual levels of multiple powered subwoofer, only the line level they are receiving. Multiple powered subwoofers requires a little more playing since you have speakers receiving the same signal that needs to be evened out.
ALRIGHT, THE REST OF YOU GUYS NEED TO PUT IN YOUR TWO CENTS AND GIVE THIS GUY A LITTLE INPUT ABOUT MULTIPLE SUBWOOFERS
