Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 477 - AVS | Home Theater Discussions And Reviews
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post #14281 of 14306 Old 03-25-2015, 03:51 PM
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Originally Posted by jim19611961 View Post
I am claiming that I can
well I'm not here to tell you what you can and cannot here, that's between you and your ears :P how do you satisfy yourself that it is decay though?
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post #14282 of 14306 Old 03-25-2015, 03:54 PM
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Originally Posted by 3ll3d00d View Post
well I'm not here to tell you what you can and cannot here, that's between you and your ears :P how do you satisfy yourself that it is decay though?
Truthfully, its probably more the timing than the decay that I am discerning (see previous GD graph). But there is some relation to delayed timing and decay in that typically delayed timing also has a longer decay relative to those frequencies not delayed.

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post #14283 of 14306 Old 03-25-2015, 06:56 PM
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Originally Posted by markus767 View Post
^
Thanks. I'd choose bhnd cch Waudy nrmlcc.
How come you would chose that over the other? Thx
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post #14284 of 14306 Old 03-25-2015, 07:07 PM
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Originally Posted by LastButNotLeast View Post
The wrong one, obviously.
Do both of my positions look OK for the group delay? I'm guessing the flat line is good? Thx
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post #14285 of 14306 Old 03-25-2015, 07:48 PM
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That is my understanding, but I'm seeing big peaks in yours that don't seem to bother anyone else.
And now I'm getting confused about spectrographs, so I'm going to grab some aspirin and call it a night.

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post #14286 of 14306 Old 03-25-2015, 08:24 PM
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Where are the peaks you mention which are unfavorable?
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post #14287 of 14306 Old 03-26-2015, 07:57 AM
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I'm hoping someone can help....


I'm having trouble taking some REW measurements. I downloaded and installed the latest version of REW and the ASIO drivers. I set up the ASIO drivers within REW. I am able to choose all 8 HDMI output channels, but I am only getting sound from channels 1 and 2 (left and right). The settings in my SSP are correct because it's showing a PCM 7.1 signal coming in for channels 1 and 2, but not for the others. My amps are also on. Is there something obvious that I am missing? Have you heard of this problem before? I'm using a laptop with an intel atom processor. Can this be a limitation (2 channels only) with the HDMI board in my laptop?


EDIT: I've read through AustinJerry's REW setup guide and I've figured it out.

Last edited by matty1137; 03-26-2015 at 01:49 PM. Reason: I solved problem
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post #14288 of 14306 Old 03-26-2015, 08:47 AM
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Originally Posted by mattdub1 View Post
Where are the peaks you mention which are unfavorable?
The three between 100 and 200, for starters.

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post #14289 of 14306 Old 03-26-2015, 08:59 AM
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^ isn't that more affected by my towers than the sub?
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post #14290 of 14306 Old 03-26-2015, 09:07 AM
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Or the interaction between them. I know flatter is better, and mine (by sheer good fortune) is flat, so I was just mentioning something else to evaluate.
For what it's worth.

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For base response measurement in my room, is this the correct method.

1. Measure L+Sub
2. Measure R+sub
3. Measure C+Sub
4. Take average of all three above and apply 1/6 smooting
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post #14292 of 14306 Unread Today, 09:52 AM
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Quote:
Originally Posted by aaranddeeman View Post
For base response measurement in my room, is this the correct method.

1. Measure L+Sub
2. Measure R+sub
3. Measure C+Sub
4. Take average of all three above and apply 1/6 smooting
I would start with SUB on its own, and then see how it crosses...you may need to adjust the sub distance to avoid dips in the xover region.


Sub on it's own





then with center....no smoothing - I did not smooth to give me the most granular results. Remember if you are using room correction, measure subs without, then run setup and retest.


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post #14293 of 14306 Unread Today, 10:31 AM
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Quote:
Originally Posted by aaranddeeman View Post
For base response measurement in my room, is this the correct method.

1. Measure L+Sub
2. Measure R+sub
3. Measure C+Sub
4. Take average of all three above and apply 1/6 smooting
The center+sub is probably the most important of the three measurements. An average serves no useful purpose. Measurement should be 15-300Hz, and presented with no smoothing. Look for overall smoothness in response, especially around the crossover frequency. The crossover smoothness may be improved by adjusting the sub distance in the AVR. Also, many prefer a gentle upward slope in bass response, starting around 70-80Hz, and rising 5-10dB by 20Hz, depending on tastes.
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post #14294 of 14306 Unread Today, 11:26 AM
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I would think you do sub only and then sub + LCR, no?
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post #14295 of 14306 Unread Today, 11:45 AM
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Originally Posted by lovingdvd View Post
I would think you do sub only and then sub + LCR, no?
There is no right answer. Each measurement has its place. I stand by my original statement that sub+center is probably the single most useful measurement to fine-tune bass response.
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Originally Posted by lovingdvd View Post
I would think you do sub only and then sub + LCR, no?
I agree with AustinJerry...in fact he has more experience on this matter than most of us combined
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post #14297 of 14306 Unread Today, 11:51 AM
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Not many systems allow sub + LCR (unless, of course, you only have a 3.1 system ). I can do it with Equalizer-APO, but I don't think you can do it directly from a typical AVR.
If your primary source is stereo music, you'll be more interested in sub + LR. Movie buffs are better off focusing on sub + C.

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post #14298 of 14306 Unread Today, 12:41 PM
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Quote:
Originally Posted by AustinJerry View Post
The center+sub is probably the most important of the three measurements. An average serves no useful purpose. Measurement should be 15-300Hz, and presented with no smoothing. Look for overall smoothness in response, especially around the crossover frequency. The crossover smoothness may be improved by adjusting the sub distance in the AVR. Also, many prefer a gentle upward slope in bass response, starting around 70-80Hz, and rising 5-10dB by 20Hz, depending on tastes.
Thanks Jerry and toofast68.
I will just do the sub, sub+center with and w/o Audyssey. Will post the FR once measured for analysis.
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post #14299 of 14306 Unread Today, 01:33 PM
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Originally Posted by AustinJerry View Post
There is no right answer. Each measurement has its place. I stand by my original statement that sub+center is probably the single most useful measurement to fine-tune bass response.
Sounds good. I don't doubt your advice, just wondering why sub + center is best. When you are watching a movie and there's a sound track playing, isn't your bass response going to be a function of the sub plus L, C and R? Not just sub + center? What is it OK to not factor in the bass also coming from the L and R?

Side question - whrn running Dirac Live EQ (with the 88A) do you even had to worry about this? Or do you just connect it and it does all the sweeps and measures it needs to with whatever speaker combos + sub it needs to?
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post #14300 of 14306 Unread Today, 01:40 PM
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Quote:
Originally Posted by lovingdvd View Post
Sounds good. I don't doubt your advice, just wondering why sub + center is best. When you are watching a movie and there's a sound track playing, isn't your bass response going to be a function of the sub plus L, C and R? Not just sub + center? What is it OK to not factor in the bass also coming from the L and R?

Side question - whrn running Dirac Live EQ (with the 88A) do you even had to worry about this? Or do you just connect it and it does all the sweeps and measures it needs to with whatever speaker combos + sub it needs to?
Bass is normally mono, and mono signals go to the center channel. The mono bass is routed to the sub below the crossover. So, for the most part, movie bass is coming from the center channel plus the subs. That is why measuring center + subs is important.

I don't understand your Dirac question. But measurements with an 88A are no different from measurements without an 88A.
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post #14301 of 14306 Unread Today, 02:02 PM
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Quote:
Originally Posted by AustinJerry View Post
Bass is normally mono, and mono signals go to the center channel. The mono bass is routed to the sub below the crossover. So, for the most part, movie bass is coming from the center channel plus the subs. That is why measuring center + subs is important.
Oh. So if your mains are set up a Large it only sends bass to the C and not R/L?

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I don't understand your Dirac question. But measurements with an 88A are no different from measurements without an 88A.
I'm under the impression with Dirac that you load up the software and press EQ and it sends whatever sweeps to whatever speakers it thinks are relevant and you don't do anything except move the mic to the next position and then run it again. In other words, Dirac takes care of knowing what to do.

Then what's the best way to test it - measure just C + subs? I see a lot of folks show their result as all + subs...?
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Originally Posted by AustinJerry View Post
Bass is normally mono, and mono signals go to the center channel.
No, monophonic bass can be found in any channel.

Markus

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Originally Posted by markus767 View Post
No, monophonic bass can be found in any channel.
That is why I'm thinking that sub + L/C/R is the way to see what your real response is, yes?
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^
"Your real response" depends on the source material that is reproduced. I'd think having monophonic bass mixed to L, C and R is not the most common case.

Markus

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Last edited by markus767; Today at 02:16 PM.
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Quote:
Originally Posted by lovingdvd View Post
Oh. So if your mains are set up a Large it only sends bass to the C and not R/L?
I am not sure why we are arguing about this. You can measure whatever you want to measure, as long as you interpret the measurements correctly.

And, if you send the same signal to left and right channels simultaneously, which is the case with mono bass, the signal comes out of the center channel. If, however, you change the AVR output from multi-channel to stereo, the bass will come from the left and right channels, of course. Now, how do you listen to your movies, in stereo or in multi-channel?
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post #14306 of 14306 Unread Today, 03:20 PM
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Quote:
Originally Posted by aaranddeeman View Post
Thanks Jerry and toofast68.
I will just do the sub, sub+center with and w/o Audyssey. Will post the FR once measured for analysis.
Okay, here's the FR.
Red : No Audyssey
Green : Audyssey no DEQ
Blue : Audyssey w/ DEQ

I know it's not pretty looking. (Room is not treated). Any advice to improve this FR is appreciated.

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