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Why, one front/one back sub, a double distance?

I have two subwoofers, both in an infinite baffle configuration (mounted in the wall, into the outside world or attic space, with,yes, a response flat below 10 htz:;and there is no other way to get this at any price).

One is in the front middle of the room (two long-throw 15"), the other in the back, right hand corner (one 18" very long throw Ficaraudio, and two very capable long-throw 10").

My Onkyo pre/pro calculates the 'distance' of the 'subwoofer' as 24 feet, exactly half of the distance from the listening position from each.

The bass is MUCH better if I override the Onkyo calculation by dividing it in half, the actual distance between the two.

What's the explanation?
pmcneil
kr4's avatar
kr4
3,688 posts
 
Typically, Audyssey will measure the "distance" of the subwoofer(s) as significantly longer than the physical distance because the delay, not the distance, is the critical measure. In the real world, that delay is sum of the physical distance and the time-delay introduced in the processing circuitry of the sub channel.

Kal
acoustat6
357 posts
 
Hi Pmcneil, you said "a response flat below 10 htz:;and there is no other way to get this at any price)."

That is a great lowwww bass response, how did you measure this? And I would love to see a graph of it. My sub is flat to 12hz, I use the free program from the Home Theater Shack "REW" with a calibrated mic. What program do you use?

Bob
summitav
163 posts
 
Have you tried running the rear sub "anti-phase"?
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