Setting Sub Crossover Freq

I should clarify a bit. IMHO, the greatest benefit you'll get from a(n) (optimally installed) sub occurs ABOVE 70hz. This benefit is the ability to address the quarter wave null and the "hump" that so often occurs about half an octave to a full octave above that.

That's why I highlighted Drew's observation. His crossover scheme in point #2 may work well for the 1/4 wave null, but there is another approach to the issue, too. You may find it easier to sharply low cut your main speakers and cross to your sub above the 1/4 wave frequency. You can then address the problem effectively by optimizing the sub's placement in the room.

Stereo subs crossed even higher (app. 120hz to 140 hz) will allow you to address the "thickness" that often occurs in this range. BTW, "bassbusters" or other hemholtz devices can also be used to deal with this issue. If you don't want to go that route, IME, you can usually place stereo subs such that imaging is unaffected despite the high x-over point and frequency response will much, much smoother through the most troublesome ranges.

Good Luck

Marty

I second the use of REQ Wizard. My Maggies are rated to about 45HZ, but the in room response according to the room EQ wizard is 65hz. I was running my sub crossed over at 45 and I felt like I had a gap in the low end, this is was prior to running the REQ Wizard and want prompted me to run in in the first place. I bumped my crossover up to 65HZ and all is good now. The optimal setting would be 80hz but the sub was a bit too localized at that setting, this may or may not be an issue with your set up, it just depends on the placement of the sub in your room.

Does the software require much in the way of miking, etc ?

One mic, preferably but not necessarily, calibrated.

Kal