I'd like to know what are the basic considerations to be made when wanting to set up dual subwoofers (placement, wiring, phase, etc.)

Primarily, what do I have to consider as far as phasing the subs goes and what's the best placement.

Normally placing them centered on opposite walls will help with room nulls/peaks.

You really need an SPL meter and test tone CD to measure the response in your room. Then you can experiment with placement, phase, etc. to get the most even response.

Make sure you measure each one separately as well as together. I had a nasty 45-60 Hz null when they were both on, and realized it was due to the position of one of the subs. When sub #2 was playing alone, the freq response was fine. Turn on #1 alone, and null. Turn both on, null. I ended up stacking them in #2's position and null gone!

I would not have figured this out if I had not also charted them one by one.

Re: Charting the subs. So I play the test CD and watch for a drop out on the SPL meter's reading? I have just added a second 10" sub to my system. It seems everything I read about sub placement contradicts the last thing I read.

Currently I have them near each other on the same corner, 1/4 on the long wall and 1/4 on the short wall.

J.

If you have a laptop and an SPL meter I HIGHLY recommend downloading REW (Room Eq Wizard) it is much more efficient than just a cd and SPL meter. It takes only about 5 secs to get a FR from 0Hz to 100Hz which makes it easier to see how placement and phase has on your calibration. The bad thing is that you will always be tweaking to find that perfect spot/s since it only takes a few seconds to run a sweep. :D

Kevin, I assume that the SPL plugs into the laptop and the program inputs the reading from the meter and graphs the results.

Your "priceless" tag made me smile. Been there, and your right, it's priceless.

Kevin, I assume that the SPL plugs into the laptop and the program inputs the reading from the meter and graphs the results.

Your "priceless" tag made me smile. Been there, and your right, it's priceless.

As soon as she said it that smile came across my face :D

In reference to your question, the spl meter plugs into the sound card. Depending on your laptop you may need an external one, the soundcard plugs into the laptop for input and the soundcard also plugs into the AVR for output. REW then sends a sweep signal using the range you want and reads what the SPL meter reads for each frequency, it is a wonderful program.

For more info, go to Home Theater Shack's website (http://www.hometheatershack.com) they will have much more info and you can download REW from there.

Good luck