Adjusting phase on 1 of 3 subs - AVS Forum
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post #1 of 2 Old 07-17-2012, 06:42 AM - Thread Starter
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I have a 18x18 square room.

Integra pre-pro with Audessey 32x.

SMS-1

3 subs. Spaced evenly across the front of the room.

Center Elemental Designs A7s-650

Right SVS PB-12 Ultra/2

Left SVS PB-12 Plus/2

I ran Audessey.

Then I ran the SMS-1

I have a pretty good dip right at 50-60hz.

Audessey set my main speakers to 40hz, so I am thinking
this might be a phase issue.

While the SMS-1 is running I go over and turn the phase on the plus/2
about half way. Flat as a pancake. I try the phase on the Ultra/2 and it
does NOT do the same thing. I did not mess with the phase on the ED.
At this point the sms-1 has no adjustments at all.

Is this ok to do? What other issues am I introducing here?
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post #2 of 2 Old 07-17-2012, 06:57 AM
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Quote:
Originally Posted by swgiust View Post

I have a 18x18 square room.
Integra pre-pro with Audessey 32x.
SMS-1
3 subs. Spaced evenly across the front of the room.
Center Elemental Designs A7s-650
Right SVS PB-12 Ultra/2
Left SVS PB-12 Plus/2
I ran Audessey.
Then I ran the SMS-1
I have a pretty good dip right at 50-60hz.
Audessey set my main speakers to 40hz, so I am thinking
this might be a phase issue.
While the SMS-1 is running I go over and turn the phase on the plus/2
about half way. Flat as a pancake. I try the phase on the Ultra/2 and it
does NOT do the same thing. I did not mess with the phase on the ED.
At this point the sms-1 has no adjustments at all.
Is this ok to do? What other issues am I introducing here?

Does your Integra allow individual distance adjustments on the two sub outs? It is normally preferred to use the distance adjustment instead of the phase control on the sub.

The dip could be a phase issue or just a room issue. I would start by measuring each sub alone without the speakers with the crossover raised as high as it can go. Then measure different combinations of the subs to see if there is a specific sub that causes the dip. If you can get the subs to be relatively flat, then it is an issue blending with your speakers so measure the left and right speakers individually, full range, without any subs. See if one of the speakers has a dip in that area. If the subs measure well, you could also try raising the crossover to 80hz.

-Mike
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