1_sufferin_mind
Hi.  I’ve only owned single subs before, so am unfamiliar with how to integrate a dual pair.  My pre/pro has independent subwoofer outputs and uses Dirac Live (Full) room correction. 

My single-sub integration method:
  • Sub crawl
  • Bass trapping
  • Level matching
  • Room correction
  • Sub phase adjustment for support through xover region.
I’ve read that with dual subs, another step is involved requiring delay adjustments.  I’m unsure if Dirac juggles that responsibility or not.  It’s my understanding that an F2+/- master/slave pair doesn’t behave the same way acoustically as do two subwoofers which are fed different signals. The master and slave are each fed the same signal.  Then—and please correct me if I’m wrong—they should either be symmetrically arranged in the room, or one should be delayed relative to the MLP.  Correct?  How is that accurately accomplished using the F2’s phase/delay adjustments?
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing."   —Daniel von Recklinghausen
 
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1_sufferin_mind
I think I need more edju-muh-kation!

Found an excellent subwoofer setup guide written by Mark on this site

Another search turned up more details covering the new amplifier’s controls, features, and adjustments.

Thank you for making that valuable information available, Mark!
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing."   —Daniel von Recklinghausen
 
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1_sufferin_mind
Please help me answer questions (in italics below) about Mark’s subwoofer integration procedure

(EDIT 1 - Some of my questions sounded rude to me on second read.  Apologies if you think the same)

(EDIT 2 - I shortened this lengthy post by deleting steps for which I had no questions)


3.  Choose the location with the balance of fewest dips and most efficiency across the subwoofer range.

QUESTION: Please explain “most efficiency.”  Could it be maximized amplitude?

5.  With multiple subwoofers overlay individual responses and then measure both together driven at the same level to see how they sum. Maximum summation of 2 equal sources is +6dB. Unless there is a big peak, the goal is to get the sum to be +0-6dB and not negative. Moving the sub or adding delay to the closer sub is my preferred way to make this adjustment.

QUESTION:  What is the purpose of overlaying subwoofer responses?  Is it to compare to the real-world summation measurements?

6.  If manually EQ'ing, now apply EQ to the subwoofer alone while also watching for peaks out to 120-200Hz that go above the target or above flat if no HP is in the measurement.

QUESTION:  What does “HP” mean? Surely not an HP SubMersive! Is it best to use the sub’s or the preamp’s parametric EQ controls?

8.  Measure the subwoofer alone and center channel alone, then the combination of the two.

QUESTiON:  Please explain why each is measured alone and what the resultant measurements reveal.   

9. Make adjustments to the subwoofer distance setting, most often adding to the physically measured distance at 0-8ms.

QUESTION:
It’s hard for me to understand the leap from Step-8 to Step-9.  Is that known as working in the time domain?  Are the graphs from Step-8 supposed to be Impulse Plots?  Can anyone please explain Step-9 in more detail?
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing."   —Daniel von Recklinghausen
 
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1_sufferin_mind
EGADS!  This is turning out to be an embarrassing endeavor for me.  I should have read further into and then studied Mark’s post before asking my questions.

...sound of sufferin’ shufflin’ off.
"If it measures good and sounds bad, -- it is bad. If it sounds good and measures bad, -- you've measured the wrong thing."   —Daniel von Recklinghausen
 
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