Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 775 - AVS Forum | Home Theater Discussions And Reviews
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post #23221 of 23223 Old Today, 07:03 AM
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Quote:
Originally Posted by tjcinnamon View Post
I read the REW guide and I'm curious what a "bad" (audible) distortion level would be?

The guide says: There are differing opinions regarding “acceptable” levels of distortion.

What is the general range and what is a universally agreed upon range. For example 10% is universally agreed upon (although likely facetious response)

Also, is there anyway to test with "all speakers driven"? With 9 channels running that's when I'm likely to get a severe power dip in my fronts.
Acceptable levels of distortion also depend on frequency. A 10% distortion at 1000Hz would probably be more noticeable than 10% at 20Hz.

Why would you want to measure all speakers driven? This would not happen often listening to real-world content.
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post #23222 of 23223 Old Today, 07:16 AM
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Quote:
Originally Posted by AustinJerry View Post
Acceptable levels of distortion also depend on frequency. A 10% distortion at 1000Hz would probably be more noticeable than 10% at 20Hz.

Why would you want to measure all speakers driven? This would not happen often listening to real-world content.
Good point. Perhaps most driven. It's likely the front 3 will be driven simultaneously then ATMOS upmixed generally adds a touch to those tracks. If the surrounds are running there's at least 2 more. So I think 7 of 9 (star trek voyager reference) could reasonably be running. I think enough to cut the wattage running to my front 3.

https://www.soundandvision.com/conte...iew-test-bench

I can't think functionally how to test something like this. I would need to run all of the speakers and then test in a different room

-------------

I'll look to see what levels of distortion debates I can find.

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post #23223 of 23223 Unread Today, 04:43 PM
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Ok took my first shot at this =) Pretty sure I probably screwed some things up haha. Following the Faq when setting up the volume I went up a little over 90db since my noise floor was a little over 50db. I am a little confused the faq says pick center channel then it says use the sub cal, which uses the sub, so why choose center channel?? I tried both sub cal and speaker cal and got 93db speaker / 95db sub based on my volume with Audyssey off and 92/92 with it on. I think I may have run out of headroom when measuring the sub , the number turned red and read 5db. Looking at my results there is a large dip between around 110db on my rear speakers, they are di/bipoles though, not sure if that has something to do with it. If anyone wouldnt mind taking a look at my results and giving me some pointers on where to go from here I would appreciate it!

I ran two runs , one without Audyssey on and one with it on reference which is what I usually use.
https://www.dropbox.com/s/bjucn31mnc...sults.zip?dl=0

Last edited by grendelrt; Today at 04:58 PM.
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