Different subwoofer at each corner?

Nrenter: Can you help us mortals with the math, please?
.7 x -3db means what? Although I know that my speakers are 92db, are you suggesting .7 x 89db = 62.3 as my crossover point? Where did you learn this one? Just curious.

If I understand Nrenter correctly, this means 0.7 multiplied by the frequency at which your speaker rolls off -3db in the bass region. A common speaker measurement, and what everyone is generally referring to when discussing how low in the bass a speaker can go. So for example, my speaker's -3dB point is 70Hz, meaning that according to Nrenter's rule of thumb, I should crossover at about 50Hz. Which interestingly is where I have the crossover set. I hadn't heard this rule of thumb, but using an SPL meter to calibrate the subs and mains, 50Hz was the point where I could get the flattest bass response. Above that and I was getting some humps between 80-100Hz.

I see. Thank you all for the great suggestions. I'll start off by lowering the crossover point to 80hz to see if that helps. I'll play around with the phase settings too.

Thanks!

I would cross them as low as your main speakers permit. I run my main speakers full range and use the subs to augment the bass. When I am using my Gamut L5s or Spendor S 100s I cross the subs at under 30 Hz; for my Spendor SP1s about 32. Some subs are intended to be used close to the corners of the room; my RELs are. A good CD to get to place them is the soundtrack from "Sneakers"; the set up guide for RELs on the Sumiko web site is also useful for setting other subs up.

Angelgz2, What speakers are you using? And specifically which Dynaudio subs? How do you have your subs connected to the system (line-level from your pre-amp, speaker level, etc?). And finally, how do you have your speakers connect to your system (connected to the subs or connected to your power amp)?