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post #1 of 15 Old 09-14-2019, 03:38 PM - Thread Starter
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How low in frequency does Audyssey XT32 calibrate subwoofers

I tried researching it and cannot find anything official. I found some 2014 posts where people stated it was a static 48Hz which seems rather high for its lowest point. Also, found some less old posts with people claiming it calibrates all the way until it detects rolloff.

Anyone know how low it will calibrate?
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post #2 of 15 Old 09-14-2019, 07:05 PM
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Down to 10HZ which is the limits of the Audyssey mic(+-2dB.)

Chane A5 towers,Chane A2.4 center,RBH bipole side surrounds, Rythmik LV12R x2,Denon X4300H, Outlaw 5000,Front B speakers: Wharfedale Diamond 10.1 books. https://www.avsforum.com/forum/90-rec...d-part-ii.html
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post #3 of 15 Old 09-18-2019, 04:02 PM
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Quote:
Originally Posted by Madmax67 View Post
Down to 10HZ which is the limits of the Audyssey mic(+-2dB.)
If your sub can go that low. If your sub is only good to 30hz, Audyssey will not correct below that point.
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post #4 of 15 Old 09-18-2019, 07:37 PM
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Quote:
Originally Posted by Alan P View Post
If your sub can go that low. If your sub is only good to 30hz, Audyssey will not correct below that point.
Good point.

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post #5 of 15 Old 09-20-2019, 12:17 AM
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Quote:
Originally Posted by checker9 View Post
I tried researching it and cannot find anything official. I found some 2014 posts where people stated it was a static 48Hz which seems rather high for its lowest point. Also, found some less old posts with people claiming it calibrates all the way until it detects rolloff.

Anyone know how low it will calibrate?
Below is my FR:



Green is with Audy off. Red is with Audy on. Clearly Audy lifted down to 5.5Hz or so.

Speakers: L/C/R: JTR Noesis 212HT. Surrounds: Jamo C103, KEF Q100, Polk Audio RTiA3.
Subwoofer: JTR Captivator 4000ULF.
AVR: Denon AVR-X4400H. TV: Samsung UN75NU8000FXZA.

FS: Jamo C103, KEF Q100 and Polk RTiA3
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post #6 of 15 Old 09-20-2019, 07:07 AM - Thread Starter
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Quote:
Originally Posted by chucky7 View Post
Below is my FR:



Green is with Audy off. Red is with Audy on. Clearly Audy lifted down to 5.5Hz or so.
Thanks. and thanks for all other responses.
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post #7 of 15 Old 09-20-2019, 04:59 PM
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Quote:
Originally Posted by chucky7 View Post
Green is with Audy off. Red is with Audy on. Clearly Audy lifted down to 5.5Hz or so.
I does look that way. . . Is it possible a big garbage truck happened to rumble by your house when you took the second Audyssey measurement?

No joke, I've read that when super low frequency measurements of major concert halls in NY are professionally measured they not only have to temporarily turn off the building's HVAC system they also have to make their measurements only after they've timed the periodic bump they get in the infrasonic response caused by the nearby subway stop. [They need to make measurements between trains.]

In one's own home one would also need to worry about rumble from refrigerators, washing machines, foot fall, etc. even rooms away.
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post #8 of 15 Old 09-20-2019, 05:07 PM
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I have a new theory. We are being fooled. It looks initially like 5hz is being bumped up but in truth a shelf from 10Hz to 30Hz has but reduced by ~5dB, plus a large overall tilt may be in play too:

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post #9 of 15 Old 09-20-2019, 05:21 PM
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Quote:
Originally Posted by m. zillch View Post
It does look that way. . . Is it possible a big garbage truck happened to rumble by your house when you took the second Audyssey measurement?

No joke, I've read that when super low frequency measurements of major concert halls in NY are professionally measured they not only have to temporarily turn off the building's HVAC system they also have to make their measurements only after they've timed the periodic bump they get in the infrasonic response caused by the nearby subway stop. [They need to make measurements between trains.]

In one's own home one would also need to worry about rumble from refrigerators, washing machines, foot fall, etc. even rooms away.
In my experience, the Audy has been doing that in all of my FR measurements.

Here is another Sub Only FR done a week prior...


Actually, I don't want the Audy to lift FR too much below 10Hz because this affects the headroom above 10Hz.

Speakers: L/C/R: JTR Noesis 212HT. Surrounds: Jamo C103, KEF Q100, Polk Audio RTiA3.
Subwoofer: JTR Captivator 4000ULF.
AVR: Denon AVR-X4400H. TV: Samsung UN75NU8000FXZA.

FS: Jamo C103, KEF Q100 and Polk RTiA3

Last edited by chucky7; 09-20-2019 at 05:34 PM.
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post #10 of 15 Old 09-20-2019, 05:28 PM
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I wouldnt bet my life on mic sensitivity...just blow on one and see 170+ spl....but with that said it looks like audyssey does adjustments very low....I wouldnt bet my life on it tho....

Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5, Magnepan LRS
Subs: Rythmik FV25HP, Rythmik FV15HP
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post #11 of 15 Old 09-20-2019, 05:45 PM
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Quote:
Originally Posted by torii View Post
I wouldnt bet my life on mic sensitivity...just blow on one and see 170+ spl....but with that said it looks like audyssey does adjustments very low....I wouldnt bet my life on it tho....
Yeah, technically, the UMIK-1 is not that great below 20Hz.

If you got 170+ dB SPL, something is wrong as with 0dB gain setting, it should measure no more than 133 dB SPL.

Speakers: L/C/R: JTR Noesis 212HT. Surrounds: Jamo C103, KEF Q100, Polk Audio RTiA3.
Subwoofer: JTR Captivator 4000ULF.
AVR: Denon AVR-X4400H. TV: Samsung UN75NU8000FXZA.

FS: Jamo C103, KEF Q100 and Polk RTiA3
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post #12 of 15 Old 09-20-2019, 05:52 PM
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Quote:
Originally Posted by chucky7 View Post
Yeah, technically, the UMIK-1 is not that great below 20Hz.

If you got 170+ dB SPL, something is wrong as with 0dB gain setting, it should measure no more than 133 dB SPL.
my comment was referring to some car stereo spl comps like port wars and such where putting a mic inside a subs ports could easily trip 165-170 db on the very expensive gear used in past. even 2000 dollar mics arent rated below 20hz usually.

here is a rew of magnepan lrs which everyone knows cant do below 40 or 50hz...also my focals in same graph with subs on....if this makes sense...
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Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5, Magnepan LRS
Subs: Rythmik FV25HP, Rythmik FV15HP

Last edited by torii; 09-20-2019 at 05:58 PM.
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post #13 of 15 Old 09-20-2019, 05:53 PM
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Quote:
Originally Posted by chucky7 View Post
Actually, I don't want the Audy to lift FR too much below 10Hz because this affects the headroom above 10Hz.
I don't think it is. I think what is throwing us is that we are errantly thinking 0dB is the same for both red and green graphs. It isn't. The system must have an "normalize the level after the EQ is applied" feature and this is visible to us by the fact that lower than 10Hz content shifts yet Audyssey tell us they never EQ below 10Hz (and only do that assuming it looks like your system truly goes that low naturally).
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post #14 of 15 Old 09-21-2019, 06:49 PM
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Here's a good test clip for you

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post #15 of 15 Old 09-24-2019, 09:24 AM
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Quote:
Originally Posted by m. zillch View Post
I don't think it is. I think what is throwing us is that we are errantly thinking 0dB is the same for both red and green graphs. It isn't. The system must have an "normalize the level after the EQ is applied" feature and this is visible to us by the fact that lower than 10Hz content shifts yet Audyssey tell us they never EQ below 10Hz (and only do that assuming it looks like your system truly goes that low naturally).
This is exactly correct. Audyssey uses "Volume Normalization" to reset the overall levels to compensate for the boosts and cuts it engages. This should result in "Unity Gain" for the signal from pre-Audyssey to post-Audyssey. Without it, if the cuts were more than the boosts, (which is the most likely scenario with Audyssey), the overall volume level would decrease with the EQ engaged. Volume Normalization resets the levels so the overall Volume In is equal to the overall Volume Out, (i.e., Unity Gain.)


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