Simplified REW Setup and Use (USB Mic & HDMI Connection) Including Measurement Techniques and How To Interpret Graphs - Page 447 - AVS | Home Theater Discussions And Reviews
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post #13381 of 13389 Unread Yesterday, 08:39 PM
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Got it (well close anyways) - attached is a bit of fun...I know I don't have a million dollar setup, but at least I have something I can begin to tweak. Any feedback hammer away at me.


OH EDIT - this is LEFT Main and SUB - which I just realized is only a starting point, I will get working on the right way to do all this...just relearning this all :-)




Last edited by toofast68; Today at 07:30 AM. Reason: Adding data
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post #13382 of 13389 Unread Yesterday, 09:13 PM
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First of all, you need to measure at a much higher level to get a meaningful waterfall graph. Did you calibrate your SPL before measuring or do you have a mic with a sensitivity factor?

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post #13383 of 13389 Unread Yesterday, 11:49 PM
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Originally Posted by toofast68 View Post
Got it (well close anyways) - attached is a bit of fun...I know I don't have a million dollar setup, but at least I have something I can begin to tweak. Any feedback hammer away at me.
There aren't any details about what you measured (sub only, left + sub, ???). Please follow the graphing methods laid out in AustinJerry's guide. A link to the guide is in his signature.
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post #13384 of 13389 Unread Today, 04:12 AM
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Originally Posted by Alan P View Post
First of all, you need to measure at a much higher level to get a meaningful waterfall graph.
Levels in that waterfall look more than adequate to me, there's no benefit from using higher levels for waterfall measurements.
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post #13385 of 13389 Unread Today, 07:29 AM
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Originally Posted by Alan P View Post
First of all, you need to measure at a much higher level to get a meaningful waterfall graph. Did you calibrate your SPL before measuring or do you have a mic with a sensitivity factor?
I am really struggling with this I guess...I did try to calibrate with my "old" SPL meter, but I must have screwed it up I guess. Also, I have a UMM-6 mic, pro calibrated by Cross Spectrum...I got a bit lost trying to figure out if I can calibrate using a sensitivity factor...I am hoping I can, seems silly that a super expensive mic relies on the calibration of a SPL meter....please give me any direction you think might help!


Thanks much!
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post #13386 of 13389 Unread Today, 08:35 AM
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Quote:
Originally Posted by toofast68 View Post
I am really struggling with this I guess...I did try to calibrate with my "old" SPL meter, but I must have screwed it up I guess. Also, I have a UMM-6 mic, pro calibrated by Cross Spectrum...I got a bit lost trying to figure out if I can calibrate using a sensitivity factor...I am hoping I can, seems silly that a super expensive mic relies on the calibration of a SPL meter....please give me any direction you think might help!


Thanks much!
If you go to the Dayton Audio website and input your UMM-6 serial number, you can download the original Dayton calibration file. If you open this with a text editor (windows Notepad or Wordpad will do) the first line will be the sensitivity information. Edit the Cross Spectrum Labs file (90 degree, narrow-band) to copy the first line from the Dayton file and insert it to become the first line of the CSL file. Now restart REW and select the edited file as the microphone correction and the sensitivity will be set automatically. I get a very good agreement between REW and my SPL meter doing this, and no longer have to perform manual calibration of the levels.
Hope the above is clear, regards, Mike.
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post #13387 of 13389 Unread Today, 08:45 AM
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Originally Posted by AV_mike View Post
If you go to the Dayton Audio website and input your UMM-6 serial number, you can download the original Dayton calibration file. If you open this with a text editor (windows Notepad or Wordpad will do) the first line will be the sensitivity information. Edit the Cross Spectrum Labs file (90 degree, narrow-band) to copy the first line from the Dayton file and insert it to become the first line of the CSL file. Now restart REW and select the edited file as the microphone correction and the sensitivity will be set automatically. I get a very good agreement between REW and my SPL meter doing this, and no longer have to perform manual calibration of the levels.
Hope the above is clear, regards, Mike.
Wow, now I am clear...and I just figured out why I was nutty...the first UMM I bought was from Dayton, and thus the sensitivity data was built in and of course ... I realized I should have bought from Cross, so this is my first time using the new mic and I just was super confused. NOW IT IS ALL CLEAR...back to work on this...but it will most likely be after the super bowl...thanks again to all!

Will report back when fixed.
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post #13388 of 13389 Unread Today, 10:13 AM
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Originally Posted by JohnPM View Post
Levels in that waterfall look more than adequate to me, there's no benefit from using higher levels for waterfall measurements.
I think what people may have been concerned about is that with (some of) the USB mics, the noise level in a common home room (untreated etc.) can show as ~50dB. It looks like he wasn't measuring a helluva lot over that. That was assuming his levels were calibrated etc., which it appears they weren't.
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post #13389 of 13389 Unread Today, 11:24 AM
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Originally Posted by cfraser View Post
I think what people may have been concerned about is that with (some of) the USB mics, the noise level in a common home room (untreated etc.) can show as ~50dB. It looks like he wasn't measuring a helluva lot over that. That was assuming his levels were calibrated etc., which it appears they weren't.
Ive have also thought that. But at the same time, REW incorporates a tracking filter which I think John will point out allows accurate results well into the noise floor.

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