How to integrate phase of a subwoofer with mains?

You probably dont want to hear this...but the tool I use is my ears. Most of the time in my experiences, there is no difference. Acoustically speaking. Technically, there are measured differences in reinforment of lower response vs cancellation. Ears...you dont need anything else for this exersize.

Start with a test tone that is below your crossover point of your mains. Set the volume to a comfortable level. Using a SPL meter at the seating position, adjust the phase of your sub that produces the highest output...you're done. Now comes the fun part of sub positioning, crossover points and volume. Good luck, and have some fun.

BRF's approach is a good one. Sometimes, though, it is easier to do that but find the setting that produces the lowest output as the null can be sharper/more defined than the peak. Then, subtract/add 180deg to that.

You might try both.

Kal

A product that I use and frequently recommend is the Velodyne SMS-1 sub controller. Attach a monitor and you will see the effect of any change to any parameter (including phase) on the frequency response at your listening position. I find it tremendously helpful in setting up/integrating subs. It also allows PEq to smooth the subs response - which may well provide dramatic improvement in your system's bottom end. That has been my experience, anyway.

Cost is $450 from Audioadvisor.com.

Good Luck

Marty

If you are interested in the Velodyne SMS-1, you might want to take a look at this link.

http://www.hometheatershack.com/forums/bfd-electronic-equalization-devices/6346-behringer-fbq2496-velodyne-sms-1-distortion.html

It is a couple of years old and maybe that problem has been fixed in the recent versions; but if you are looking to buy used, you might want to double check.