Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 362 - AVS Forum
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post #10831 of 10840 Old Yesterday, 08:47 PM
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Originally Posted by HDgaming42 View Post
Which flavour of audyssey is that? I've got XT32 on my 805, so I'm hopeful it can perform similar magic.
I just got pain ol' XT (Denon 2113ci).

Keep in mind that you need to find the proper placement before running Audyssey if you want good results. This is essential!

My placement in the graphs I posted are not ideal, I only have the subs placed where they are because I need (crave?) the output. I can get a much better response (without the nasty null) with different placement....it's a trade off. Sometimes you gotta make the difficult choices.

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Originally Posted by AustinJerry View Post
If you look closely at the waterfalls, I don't see a significant difference in bass resonance with Audyssey on or off. The frequency response improves with Audyssey on, which is expected, but Audyssey has marginal impact on reducing resonance. There was a lengthy discussion earlier in this thread regarding the relationship between room correction and resonance, and there were a number of examples provided that demonstrated that room correction actually made resonance worse.

As you attempt to improve your bass response, be aware that taming resonance is just as important as smoothing the frequency response.
True. But please note that my decay times are pretty darn good to start with and even get slightly better (under 40hz) post-Audyssey.

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Originally Posted by jim19611961 View Post
In addition, it was also shown that those areas where processing filled in nulls was often areas of significant distortion levels.
Yeah, my THD is up to about 7.6% around 60hz where Audyssey is trying to fill in the null...doesn't make me happy. Still a work in progress.
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post #10832 of 10840 Old Today, 06:18 AM
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Yeah, my THD is up to about 7.6% around 60hz where Audyssey is trying to fill in the null...doesn't make me happy. Still a work in progress.
I suspected such was the case. You know, another sub running in just the area of the null, with proper placement, and XO alignment, might fill it in without the distortion increase

How many subs do you have presently?

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Last edited by jim19611961; Today at 07:03 AM.
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post #10833 of 10840 Old Today, 07:34 AM
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Yeah Jim, the answer is always "more subs"!

Currently, I have 4 PSA XS15s in 2 stacks of 2 in the front of the room (~5000 cu. ft.). 2 up front/2 in back provides a nice smooth response with little distortion, but the subs ain't powerful enough to reach reference in that config....like I said, it's a trade off - and still a work in progress.

2 more XS15s would almost certainly solve all my issues.
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post #10834 of 10840 Old Today, 07:44 AM
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Originally Posted by Alan P View Post
Yeah Jim, the answer is always "more subs"!

Currently, I have 4 PSA XS15s in 2 stacks of 2 in the front of the room (~5000 cu. ft.). 2 up front/2 in back provides a nice smooth response with little distortion, but the subs ain't powerful enough to reach reference in that config....like I said, it's a trade off - and still a work in progress.

2 more XS15s would almost certainly solve all my issues.
Putting 2 in the back isnt loud enough ? (4) 15" high excursion 550w subs?

You must listen at levels far higher than I do (88-94SPLdb).

I have a total of (6) 10" drivers (including mains) that see only about 100 watts a piece and have limited excursion (7.6mm) in a somewhat smaller space (3200 cu ft).

In any case, apparently (havent seen graphs of that setup), you know how to get a flatter, undistorted sound if you want to.

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Jenzen Next ( http://www.troelsgravesen.dk/Jenzen-NEXT.htm )
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Last edited by jim19611961; Today at 08:05 AM.
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post #10835 of 10840 Old Today, 07:44 AM
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Quote:
Originally Posted by Alan P View Post
Yeah Jim, the answer is always "more subs"!
Remember that the boffins over @ Harman did simulations with up to 5000 IIRC. So you've a ways to go.
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post #10836 of 10840 Old Today, 08:24 AM
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Just get one of these and be done with it.

My Room
http://www.gearslutz.com/board/studio-building-acoustics/817205-my-listening-room.html

My Music
http://rateyourmusic.com/~jim1961

My Equipment

Rega - Apollo
Rega - DAC
Goldpoint Passive
(2) Classe CA-100 bridged power amps (350w)
Jenzen Next ( http://www.troelsgravesen.dk/Jenzen-NEXT.htm )
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post #10837 of 10840 Old Today, 08:27 AM
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Originally Posted by jim19611961 View Post
Putting 2 in the back isnt loud enough ? (4) 15" high excursion 550w subs?

You must listen at levels far higher than I do (88-94SPLdb).

I have a total of (6) 10" drivers (including mains) that see only about 100 watts a piece and have limited excursion (7.6mm) in a somewhat smaller space (3200 cu ft).

In any case, apparently (havent seen graphs of that setup), you know how to get a flatter, undistorted sound if you want to.
That's the thing...I almost never listen at reference, but I'd like to be able to whenever I want to. That being said, I've been thinking of trying the more spread-out, better response setup again....and you've got me thinking about it even more.

Audessey Off:



Audyssey On:

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post #10838 of 10840 Old Today, 08:33 AM
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Originally Posted by Alan P View Post
That's the thing...I almost never listen at reference, but I'd like to be able to whenever I want to.
That does look better to me.

When you say "reference", what is that exactly?

From what I have seen, and different people say different things, 110SPLdb minimum capability is considered a reference. My system barely gets there. I can only assume yours is much higher than this.

My Room
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Rega - Apollo
Rega - DAC
Goldpoint Passive
(2) Classe CA-100 bridged power amps (350w)
Jenzen Next ( http://www.troelsgravesen.dk/Jenzen-NEXT.htm )
...

Last edited by jim19611961; Today at 08:44 AM.
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post #10839 of 10840 Old Today, 09:03 AM
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Quote:
Originally Posted by AustinJerry View Post
If you look closely at the waterfalls, I don't see a significant difference in bass resonance with Audyssey on or off. The frequency response improves with Audyssey on, which is expected, but Audyssey has marginal impact on reducing resonance. There was a lengthy discussion earlier in this thread regarding the relationship between room correction and resonance, and there were a number of examples provided that demonstrated that room correction actually made resonance worse.

As you attempt to improve your bass response, be aware that taming resonance is just as important as smoothing the frequency response.
I'll go back and dig for this--sounds interesting. Looking at the waterfalls (I'm still learning!) this distortion you speak of regarding resonance shows as the increased length of the "fingers" around 50Hz? The additional poorly sloped "humps" that appear with Audyssey enagaged? Or am I misinterpreting that?
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post #10840 of 10840 Old Today, 09:33 AM
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need a better analysis to data collection ratio!

It appears I have more data that shows a very similar result to REWs Room Simulator prediction(s).

The best result I had across the front wall:



And the furthest I measured into the room along the front wall:


I'd say the second graph shows more resonance, but a better FR. Trapping should address the resonance, so it is clear the second graph (deeper into the room) is a better placement for my sub, correct? The more I move the sub toward the rear of the room, the better the FR it seems. Highly impractical in my setting as I have a door, a bookcase and an equipment rack in the rear of the room, but worth pursuing a compromise I think.

(I intend on measuring everything that is feasible behind the MLP but starting at REWs best prediction. I can alter the MLP to fine tune as well)
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