"Official" Audyssey thread (FAQ in post #51779) - Page 2429 - AVS Forum
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post #72841 of 72851 Old Today, 07:33 AM
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"they are the correction being applied."

Being shown the correction being applied can't I use that information and address my speaker's crossovers?

The recently run results show a needed increase in high frequencies in my center channel. Maybe I increased the resistance in the tweeter's crossover for the center channel a bit too much?

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post #72842 of 72851 Old Today, 07:46 AM
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Quote:
Originally Posted by jsmiddleton4 View Post
"they are the correction being applied."

Being shown the correction being applied can't I use that information and address my speaker's crossovers?

The recently run results show a needed increase in high frequencies in my center channel. Maybe I increased the resistance in the tweeter's crossover for the center channel a bit too much?
In theory, yes, you can use the correction graphs to make intelligent decisions.

In practice, however, they are incredibly crude representations. Plus of course you are seeing a combination of room + speaker so I wouldn't necessarily make speaker design choices base on them even in the best case.

If you are looking to precisely measure the impact of your DIY project tweaks why on earth would you try to use those as opposed to spending $100 on a mic and downloading REW for free to take REAL measurements!?
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post #72843 of 72851 Old Today, 07:53 AM
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Quote:
Originally Posted by jsmiddleton4 View Post
"they are the correction being applied."

Being shown the correction being applied can't I use that information and address my speaker's crossovers?

The recently run results show a needed increase in high frequencies in my center channel. Maybe I increased the resistance in the tweeter's crossover for the center channel a bit too much?
Do you mean you want to modify the circuitry of the crossover built into your center speaker for an increaded output at high frequencies?

How is your center positioned in your setup? It's always best (read: must) to make sure the center faces seated ear height so it can deliver the widest frequency range on-axis and if not you need some clever way to tilt it up or down depending on location vs. screen. I would start from here and then re-run Audyssey.
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post #72844 of 72851 Old Today, 08:12 AM
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"why on earth would you try to use those as opposed to spending $100 on a mic and downloading REW"

Because I own the 3808 and I only do my own as in a limited number of speakers. Not going to spend 100 dollars tweaking one center channel.

Speaker placement does not drive my home theater/front room furniture placement. I understand there are optimum places in which to put speakers. Family lives in the room too. Which is why Audyssey is of value. Helps real world settings maximize the sound experience.

"Do you mean you want to modify the circuitry of the crossover built into your center speaker for an increaded output at high frequencies?"

Yes. Still thinking about dropping one 6 ohm resister out of the tweeter's xover network and re-running Audyssey.

Good news is Audyssey was able to address the room, speakers and current crossover and adjust successfully.

Thing sounds amazing.

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post #72845 of 72851 Old Today, 09:19 AM
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Originally Posted by batpig View Post
Keith you are thinking of the Pro graphs. The graphs he is talking about (in the receiver GUI) are neither before not after, they are the correction being applied.
Ah so - thanks. As you know my current Denon is the first I have ever had, and it doesn't feature these graphs. I have always thought that they represented the 'after' situation like the pro graphs, which are pretty useless anyway of course as they are just representations of what the response ought to look like after calibration, not what it does look like. Thanks for the heads-up.
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post #72846 of 72851 Old Today, 09:27 AM
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Originally Posted by techguy378 View Post
To quote:

Now, a graph with the same set of test tones, but with Audyssey turned on. Note that the 30 kHz signal is no longer there. That is because the signal has been downsampled to 48 kHz, and the maximum analog frequency that can be passed through to the output is 1/2 of that, which is 24 kHz.
You are misinterpreting his statement. Downsampling to 48kHz for any higher input SAMPLING frequencies generally implies that the AUDIO output is limited to 24kHz. However, nowhere does David say that SAMPLING frequencies of 48kHz are downsampled to 24kHz!

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I'm still learning. I thought 48kHz was not downsampled to half. ,,, Only everything above 48kHz was downsampled to 48k.
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post #72847 of 72851 Old Today, 09:52 AM
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"I have always thought that they represented the 'after' situation"

Well in a way they sorta do. Based on the answer to my question the graph is what Audyssey is adding after it does its assessment.

If it was the before than I would conclude my crossover is too hot in the high frequencies.

Being after I can conclude my crossover is too cool for those same frequencies.

Impact is add a resistor, or change where it is placed in my simple crossover network, or remove the resistor. Two very different possible conclusions of course.

The graphs are nice but as my question underscores if we don't know exactly what we're looking at in terms of what point in the process the graph has grabbed data to display any conclusion in terms of possible changes are impossible to make.

Will be dropping that 6 ohm resister shortly and running Audyssey again. Yes there are better ways to do this kind of thing but this works well enough for my needs.

E.B. White said, "I arise in the morning torn between a desire to improve the world and a desire to enjoy the world. This makes it hard to plan the day."
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post #72848 of 72851 Old Today, 09:56 AM
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Originally Posted by jsmiddleton4 View Post
Will be dropping that 6 ohm resister shortly and running Audyssey again. Yes there are better ways to do this kind of thing but this works well enough for my needs.
Just out of curiosity jsmiddleton, what brand/model # is your center speaker?
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post #72849 of 72851 Old Today, 10:50 AM
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Home made.

E.B. White said, "I arise in the morning torn between a desire to improve the world and a desire to enjoy the world. This makes it hard to plan the day."
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post #72850 of 72851 Old Today, 11:56 AM
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Resistor out. Once family wakes from post-Thanksgiving naps will recalibrate. Interested to see effect....

Needed equalization, yes I know Audyssey does more than that, should be less in the upper range for the Center Channel. But room acoustics often don't listen to my logic.....


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post #72851 of 72851 Old Today, 05:22 PM
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Quote:
Originally Posted by mogorf View Post
Let's stop here for a moment Guys! Down-sampling to 24 kHz would mean the highest frequency reproduced by the AVR would be 12 kHz (analog) only. (Please refer to the Nyquist theorem.) ... No microphone, no speakers, no ears need such resulution at all, IMHO. For me room correction is more important.
I think I agree. And, since, using REW, we can measure response, after the signal has passed through Audyssey correction, that is considerably higher than 12K, it can't have down-sampled to 24 KHz.

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A momentus day. For once, we agree on something. You are completely correct. And a good post from Chris Kyriakakis to back it up too if I may say so.
Yes, and you both can spell Kyriakakis!
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