"Official" Audyssey thread (FAQ in post #51779) - Page 2419 - AVS Forum
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post #72541 of 72555 Old Yesterday, 03:13 PM
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Forgive me if this question has already been asked - I tried to search the thread but didn't see my key phrase come up, despite a number of hits in the search.

Question is this: I'm looking at getting a new AVR soon with dual subwoofer outputs, Audyssey XT32 and Sub EQ HT. But I want to run a four subwoofer configuration. Can I hook up two subs to one output using a y-splitter, two to another output with another y-splitter, and then have Audyssey do its subwoofer calibration?

Or will it screw it up because it thinks it is measuring one subwoofer at a time, when in reality it is measuring two at a time?

For what it is worth all four subs will be identical and will be placed around a room to smooth out bass response, and the room will have extensive bass trapping in place prior to using Audyssey.

"Don't forget that a significant contribution made by the use of high-end cabling is emotional. Knowing that you have the best available causes the listening and viewing to be that much more enjoyable. Observable improvements make it even better."

-From a post on the audio video improvements forum
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post #72542 of 72555 Old Yesterday, 03:23 PM
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Yes, all good to go; four subs with two "Y" splitters. ...It will calibrate (EQ) your four subs as two pairs.
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post #72543 of 72555 Old Yesterday, 03:32 PM
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Quote:
Originally Posted by NorthSky View Post
Yes, all good to go; four subs with two "Y" splitters. ...It will calibrate (EQ) your four subs as two pairs.
...provided each two Y-splitted subs are set up to be level matched and equidistant from MLP b4 running MultEQ. For best results. Just a thought.
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post #72544 of 72555 Old Yesterday, 03:37 PM
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Quote:
Originally Posted by chrisreeves View Post
Forgive me if this question has already been asked - I tried to search the thread but didn't see my key phrase come up, despite a number of hits in the search.

Question is this: I'm looking at getting a new AVR soon with dual subwoofer outputs, Audyssey XT32 and Sub EQ HT. But I want to run a four subwoofer configuration. Can I hook up two subs to one output using a y-splitter, two to another output with another y-splitter, and then have Audyssey do its subwoofer calibration?

Or will it screw it up because it thinks it is measuring one subwoofer at a time, when in reality it is measuring two at a time?

For what it is worth all four subs will be identical and will be placed around the room to smooth out bass response.
I have this exact configuration--the Denon 4520 and four identical Hsu ULS-15 subs. I have it configured exactly as you have suggested, a pair of subs on each channel.

I would like to add several more tips: Make sure each sub pair is gain-matched. To do this, play the AVR pink noise level-setting tone for the sub channel, turn off one sub, place an SPL meter a couple of inches in front of the dust cap of the other sub, and adjust the sub's gain to something close to 90dB. Repeat the process for the second sub, making sure its gain achieves the same 90dB reading. I use 90dB for the near-field measurement because this results in ~75dB at the MLP. You will be asked to set the sub levels at the beginning of the Audyssey calibration, so if the 90dB gain matching registers higher or lower than 75dB +/- 2dB in the calibration, go back to the gain-matching step and adjust both sub gains slightly higher/lower (preserving the gain-matching, of course).

And second, since Audyssey can only set one delay (distance) setting for each of the two sub channels, try and place each sub in a sub pair equidistant from the MLP. For example, one of my sub pairs is placed on the front wall at the 1/4 and 3/4 spots, both the same distance from the MLP.

And finally, if you have the measurement tools, you should follow the "sub distance tweak" procedure to ensure the subs are in phase with the main speakers. The procedure ids described here: https://dl.dropboxusercontent.com/u/...Oct%202013.pdf
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post #72545 of 72555 Old Yesterday, 03:38 PM
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Thanks so much guys!

"Don't forget that a significant contribution made by the use of high-end cabling is emotional. Knowing that you have the best available causes the listening and viewing to be that much more enjoyable. Observable improvements make it even better."

-From a post on the audio video improvements forum
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post #72546 of 72555 Old Yesterday, 03:39 PM
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Originally Posted by mogorf View Post
...provided each two Y-splitted subs are set up to be level matched and equidistant from MLP b4 running MultEQ. For best results. Just a thought.
Good advice, Feri. Were you looking over my shoulder while I was typing?
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post #72547 of 72555 Old Yesterday, 03:39 PM
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Originally Posted by mogorf View Post
...provided each two Y-splitted subs are set up to be level matched and equidistant from MLP b4 running MultEQ. For best results. Just a thought.
But of course, that was already assumed in my sentence.
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post #72548 of 72555 Old Yesterday, 03:41 PM
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Originally Posted by NorthSky View Post
But of course, that was already assumed in my sentence.
Yes, of course, Bob, we forgot to read between the lines.
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post #72549 of 72555 Old Yesterday, 03:43 PM
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Do you have friendly intentions? ...Only those I don't ignore.
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post #72550 of 72555 Old Yesterday, 03:50 PM
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Quote:
Originally Posted by AustinJerry View Post
Good advice, Feri. Were you looking over my shoulder while I was typing?
YES, Sir...
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post #72551 of 72555 Old Yesterday, 03:55 PM
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Quote:
Originally Posted by NorthSky View Post
But of course, that was already assumed in my sentence.
Of course, sentence is sentence, isn't it Bob?

Last edited by mogorf; Yesterday at 03:58 PM.
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post #72552 of 72555 Old Yesterday, 04:56 PM
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The importance is that the guy asking the question is happy. ...And he is; nothing else truly matters.
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post #72553 of 72555 Old Yesterday, 05:20 PM
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Originally Posted by NorthSky View Post
The importance is that the guy asking the question is happy. ...And he is; nothing else truly matters.
Teamwork,...I strongly believe in teamwork...
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post #72554 of 72555 Old Today, 07:02 AM
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Originally Posted by Autorotate View Post
Thank you very much for providing this link. I have just made it through majority of it. I learned some interesting things, but this is only the tip of the iceberg for me.

Just to recap:

1) I am already plugged into my LFE port

2) I should try turning up my gain and then run Audyssey again? Rythmik instructions
recommended the gain at 0db for setup. What should I set the gain to?

3) I read that you can bypass the Audyssey initial setting of 75db. Mark Seaton recommended this in your post. I could not find a way to bypass it. It was making me either turn down my volume on the sub or cancel that I was going to use a sub for testing. I could not even keep my sub at mid volume for testing purposes.

4) After running MultEq, I should then run Dynamic Eq?

5) Turn off Dynamic Volume and make sure Dynamic Eq is turned on?


Earlier in the day before I posted this, I tried listening the the Audyssey subwoofer "too loud" and turning down the volume until I reached 75db. I also set the extension filter to high. Other than those two adjustments, I left all the recommended setup instructions from Rythmik. I will include pictures of my results. I then went into the settings manually and set the large speakers to "small" and the bass level from -5db to +3db. I did notice a considerable difference in the bass output when I put some music on. However, this time I also turned the volume (on the sub) up over half way and had a ton of background noise.

Results below from the following settings:

LFE Delay/Phase: 0
PEQ:Off Crossover: Max
Gain:0db Volume:Under middle (Required to get lower than 75db)
Bandwidth: Middle LowPass Filter: AVR/12
Frequency: Middle (40hz) Rumble Filter: Off/1 for one port
Extension Filter: 14Hz high damping
The idea is to get the sub trim somewhere like -3.5dB. This then gives you the option of running the sub a little 'hot' if you prefer a bit more bass after the Audyssey calibration (most do) without going into positive sub trim territory (which can clip the sub amp input on some subs). When you get to the screen where Audyssey asks you to set the level to 75dB, you can just skip past that screen if you wish. Just aim for a final sub trim, after cal, of about -3.5dB or even lower.

After the cal, Dynamic EQ defaults to on. Leave it there. You only need Dynamic Volume on for late night listening if you wish to avoid distrubing others. Both Dynamic EQ and Dynamic Volume are explained fully in the FAQ.
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post #72555 of 72555 Old Today, 07:08 AM
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Quote:
Originally Posted by kbarnes701 View Post
The idea is to get the sub trim somewhere like -3.5dB. This then gives you the option of running the sub a little 'hot' if you prefer a bit more bass after the Audyssey calibration (most do) without going into positive sub trim territory (which can clip the sub amp input on some subs). When you get to the screen where Audyssey asks you to set the level to 75dB, you can just skip past that screen if you wish. Just aim for a final sub trim, after cal, of about -3.5dB or even lower.

After the cal, Dynamic EQ defaults to on. Leave it there. You only need Dynamic Volume on for late night listening if you wish to avoid distrubing others. Both Dynamic EQ and Dynamic Volume are explained fully in the FAQ.
Thank you for the update. I am sitting down about to calibrate as I type. I was waiting on the arrival of my ground loop isolator. Audyssey originally had me at -5.0db. I then went back in and manually set it to +3, but you are saying that is too much. I have to read more about the gain and how that will help my bass output.

Heading in to give it another shot now!! Come on bass!!
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