Dual sub calibration - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 13 Old 09-20-2018, 10:31 AM - Thread Starter
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Dual sub calibration

Am uncertain about the importance and meaning of multiple sub calibration.

I presently have 2 subs in a 5.2.2 (front speakers) setup.

I need a new receiver. What I am not certain about is the value to me in my rather large and open room (that seems to have reasonably good, uncomplicated acoustics) is:
1. How important is it to calibrate the subs separately to achieve good sub performance?
2. If that is VERY important, then do I understand correctly that Audyssey XT32 is the only calibration system that will do that (effectively)?
3. Or, is there another AVR whose calibration system would do a good job of this (Yamaha, Onkyo, Pioneer)?
4. Or, will an AVR having simply 2 sub-preouts (each receiving and outputting the same signal, irrespective of the actual sub positions) work as well? Or even NEARLY as well?

Obviously, if #4 is even close to reality, it will simplify my choices, and lower my (“conservative”) budget.

Thanks!

Jim
St. Louis, MO area
AVRs: Denon AVR-X4400H, Onkyo TX-NR1030, Denon AVR-X3400H, Onkyo TX-NR646
Speakers: BIC America LH6-LCR and FH-65B, Polk RTi6, Infinity Primus P362, Klipsch KSF-C5
Subs: Polk PSW505 x 2, Klipsch Synergy Sub-10
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post #2 of 13 Old 09-20-2018, 10:42 AM
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I believe most room correction systems (not sure about Dirac) EQ the two subs as one even if the AVR has dual sub outs. They get level and distance separately, but are EQ'd as one. Another choice would to be to get a miniDSP that could EQ the subs separately, then possibly save some money on the AVR. You still want the best equalization system you feel like paying for, but then one sub out would be all you'd need, at least for 2 subs.
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post #3 of 13 Old 09-21-2018, 11:22 AM
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If the optimal placement in your room has each of the two subs roughly equidistant to the MLP, then you do not need to individually set distances. If there is a large difference in the physical distance from each sub to the MLP, then you would benefit from having the ability to set separate distances (delays). This can be accomplished with either an AVR with the ability (i.e. XT32), an outboard device (i.e. MiniDSP) or subwoofers with built in delay adjustments on the amp (i.e. PSA, Rythmik).
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post #4 of 13 Old 09-22-2018, 02:56 PM
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Dirac Live /endthread

| Eqmt | Vizio 4K M50-E1 | Yamaha RX-V681 | iNUKE 3kdsp x2 | Emotiva BasX A-100 | miniDSP UMIK-1 | Monolith M1060 | Monolith USB DAC |
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post #5 of 13 Old 09-24-2018, 12:27 PM
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Quote:
Originally Posted by DaBateman View Post
Dirac Live /endthread


Dirac Live does not attempt to optimize dual subs at all. Audyssey XT 32 is more advanced in that area. If you want dual subs with Dirac you either set delay/level manually or don’t worry about it.


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post #6 of 13 Old 09-25-2018, 01:14 PM - Thread Starter
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Is this reasonably close to being correct: I have 2 identical subs setup in a 5.2.2 arrangement. My preference would be to perform individual sub calibration via my AVR. However, as I am purchasing a new AVR, and I want to use both my subs (Polk PSW-505, and they will stay at their present locations, in the front of the listening area), am I still able to get "reasonably" good sub performance from a 7.2 AVR that sends the same signal to both sub pre-outs?

Thank you for your responses!

EDIT: a 7.2 AVR that splits the signal to two pre-outs is less expensive than an AVR permitting independent sub calibration????

Jim
St. Louis, MO area
AVRs: Denon AVR-X4400H, Onkyo TX-NR1030, Denon AVR-X3400H, Onkyo TX-NR646
Speakers: BIC America LH6-LCR and FH-65B, Polk RTi6, Infinity Primus P362, Klipsch KSF-C5
Subs: Polk PSW505 x 2, Klipsch Synergy Sub-10

Last edited by jwb0007; 09-25-2018 at 02:38 PM.
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post #7 of 13 Old 09-25-2018, 02:42 PM - Thread Starter
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EXACT answer provided in another thread. Thanks to all!

Consider CLOSED.

Jim
St. Louis, MO area
AVRs: Denon AVR-X4400H, Onkyo TX-NR1030, Denon AVR-X3400H, Onkyo TX-NR646
Speakers: BIC America LH6-LCR and FH-65B, Polk RTi6, Infinity Primus P362, Klipsch KSF-C5
Subs: Polk PSW505 x 2, Klipsch Synergy Sub-10
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post #8 of 13 Old 09-25-2018, 03:16 PM
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Glad you found your answer elsewhere, but it would be nice to know what the answer was.
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post #9 of 13 Old 09-25-2018, 05:37 PM - Thread Starter
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Quote:
Originally Posted by Alan P View Post
Glad you found your answer elsewhere, but it would be nice to know what the answer was.
AlanP:

IrishHT says:
In my understanding, both outputs will send an identical signal to your subs. Being discrete would only be if your AVR has a form of auto EQ that would adjust your subs independently. For example, my AVR is a 7.2 but my auto EQ(MultEQ XT) would adjust both subs as one giant one rather than individually.


Another Luminary you may recognize said this:
AFAIK, there are no AVRs that offer independent EQ for dual subs, and for good reason. Multiple subs should be EQ'ed while working together, not separately. However, separate delay and level controls are very beneficial.

Jim
St. Louis, MO area
AVRs: Denon AVR-X4400H, Onkyo TX-NR1030, Denon AVR-X3400H, Onkyo TX-NR646
Speakers: BIC America LH6-LCR and FH-65B, Polk RTi6, Infinity Primus P362, Klipsch KSF-C5
Subs: Polk PSW505 x 2, Klipsch Synergy Sub-10
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post #10 of 13 Old 09-25-2018, 07:37 PM
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You don't want whichever REQ you choose to EQ the subs independently, but if they are not equidistant to the MLP, you DO want it to set individual delay/distance and level setting and then EQ them as one. XT32 (with SubEQ HT) does this. From memory some of the older Onkyo's had Audyssey XT32 but no SubEQ HT
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TV: Panasonic P65ST60 AVR: Denon 4311ci Speakers: PSA MTM-210C (Centre), PSA MTM-210 (Left & Right), PSA MT-110 (Surrounds) Subwoofers: Dual Seaton SubMersives
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post #11 of 13 Old 09-26-2018, 05:43 AM - Thread Starter
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Roger that, Jamie.

My two subs are front left and right, and nearly equidistant from the MLP. Alright, alright, I know the purists will shudder, but I am able to live with it . . . .
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Jim
St. Louis, MO area
AVRs: Denon AVR-X4400H, Onkyo TX-NR1030, Denon AVR-X3400H, Onkyo TX-NR646
Speakers: BIC America LH6-LCR and FH-65B, Polk RTi6, Infinity Primus P362, Klipsch KSF-C5
Subs: Polk PSW505 x 2, Klipsch Synergy Sub-10
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post #12 of 13 Old 09-26-2018, 09:02 AM
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Quote:
Originally Posted by jwb0007 View Post
Roger that, Jamie.

My two subs are front left and right, and nearly equidistant from the MLP. Alright, alright, I know the purists will shudder, but I am able to live with it . . . .
So are mine mate. In most living/family/multi-use rooms it's often the only available place, and despite the "shuddering purists" luckily it CAN still result in a half decent frequency response (and excellent sound!), especially if you have the ability to measure the room with REW and can move the seating back or forward (positional EQ)



. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TV: Panasonic P65ST60 AVR: Denon 4311ci Speakers: PSA MTM-210C (Centre), PSA MTM-210 (Left & Right), PSA MT-110 (Surrounds) Subwoofers: Dual Seaton SubMersives
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post #13 of 13 Old 09-26-2018, 01:18 PM - Thread Starter
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That graph looks good!

The only sensing equipment I have is an original 72-year old Mark 1 eardrum. Sounds good to this old-timer.

Po' folks does as po' folks can, I suppose!
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Jim
St. Louis, MO area
AVRs: Denon AVR-X4400H, Onkyo TX-NR1030, Denon AVR-X3400H, Onkyo TX-NR646
Speakers: BIC America LH6-LCR and FH-65B, Polk RTi6, Infinity Primus P362, Klipsch KSF-C5
Subs: Polk PSW505 x 2, Klipsch Synergy Sub-10
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