New Dayton Audio UMM-6 USB mic - Page 6 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #51 of 84 Old 02-19-13, 03:47 PM
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Re: New Dayton Audio UMM-6 USB mic

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Would this have any effect on the calibration files?
It shouldn't, the calibration files are the "best case" - if you're running it at 48 kHz, you have the full data set. If you're running it at 44.1, the data is being rolled off at (or before) 22.5 kHz, but up to that point it's accurate.
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post #52 of 84 Old 02-20-13, 01:02 PM
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Re: New Dayton Audio UMM-6 USB mic

I have been wanting to get a mic for use with REW for some time now and I was going to order the UMIK-1 when it became available but since reading the issues regarding the Cal files, sensitivity and it not being able to monitor below 20hz is the UMM-6 the best option under $200 for a USB mic currently?
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post #53 of 84 Old 02-20-13, 01:04 PM
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Re: New Dayton Audio UMM-6 USB mic

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it not being able to monitor below 20hz
Huh? That's news to me.
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post #54 of 84 Old 02-20-13, 02:11 PM
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Re: New Dayton Audio UMM-6 USB mic

Has anyone been able to get the UMM-6 to work with REW 5.0 under Win 7? The mic works fine with ARTA and HolmImpulse, but not with REW. I'm presuming I've missed a configuration option someplace.

edit: nevermind I figured it out.

Last edited by Anechoic; 02-20-13 at 02:18 PM.
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post #55 of 84 Old 02-20-13, 02:14 PM
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Re: New Dayton Audio UMM-6 USB mic

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Huh? That's news to me.
See post #8022 by the DevTeam at this link:

http://www.minidsp.com/forum/18-umik...&start=36#8022
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post #56 of 84 Old 02-20-13, 02:24 PM
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Re: New Dayton Audio UMM-6 USB mic

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Anechoic wrote: View Post
Has anyone been able to get the UMM-6 to work with REW 5.0 under Win 7? The mic works fine with ARTA and HolmImpulse, but not with REW. I'm presuming I've missed a configuration option someplace.

edit: nevermind I figured it out.
Hi Herb,
I'm running the latest beta version of REW on a Win7 Laptop - and the UMM-6 works just fine. It was recognised the first time I connected it, and appeared in the Sound panel within Control Panel. When I've next got the laptop out I'll have a look for the sample rate selection you mentioned earlier.
So far the 1kHz (and above) spikes have not affected my measurements - as I am measuring well above the noise floor.
It's great to know that the measurements actually mean something at last, absolute (calibrated) not just relative.
Regards, Mike
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post #57 of 84 Old 02-20-13, 02:31 PM
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Re: New Dayton Audio UMM-6 USB mic

Does the UMM-6 have the sensitivity reading in the calibration file like the UMIK?
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post #58 of 84 Old 02-27-13, 07:23 PM
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Re: New Dayton Audio UMM-6 USB mic

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One aspect of the UMM-6 I was just made aware of - it apparently has a pretty high noise floor (around 50-52 dBA). For comparison, the typical noise floor range of the EMM-6 is ~30-34 dBA and for the ECM8000, it's ~ 33-40 dBA. The noise floor for my Type 1 mics is around 15-17 dBA.
Following up on this, here is a comparison of the noise floors of a UMM-6, an EMM-6 and a UMIK-1 microphone:


All three mics have been level calibrated, but I did not adjust any of the input settings to try to optimize any of the three mics. I'll let the plot speak for it self, but my takeway:

- when looking at A-weighted noise floor, the UMIK-1 is about 49 dBA, the UMM-6 about 53 dBA and the EMM-6 about 33 dBA. Despite the high-order harmonics of the UMM-6 having a greater amplitude compared to the UMIK-1, the overall noise floor is not that difference since the A-weighting reduces the influence of higher frequencies. The spikes at 1 and 2 kHz for the UMIK-1 and UMM-6 are within a couple dB of each other.

- IMO, the UMM-6 is absolutely not usable for high-frequency distortion measurements. The UMIK-6 is only mostly not useable for high-frequency distortion measurements.

- just a note: the 120 and 240 Hz spikes on the EMM-6 graph are caused by the AC power supply of my Presonus Firebox, when I connect the mic to battery-powered sound meters, those spikes aren't there.

- as I said before, both mics should be fine for most measurements provided you stay 10 dB above the noise floor. I suppose it may be possible to optimize this a bit by experimenting with the sound control panel volume settings, but I don't have the time to experiment with that right now.
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post #59 of 84 Old 02-27-13, 10:38 PM
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Re: New Dayton Audio UMM-6 USB mic

I've been thinking of trying out REW for quite a while, actually bought a UCA202 a while back and almost got started with it until I got distracted. After reading about the UMIK-1 and UMM-6 mics I'm thinking of one of those to get a better idea of things vs an old RS analog meter that I have.

I've read about the UMIK-1's calibration file oddities and might lean toward the UMM-6, but also read that the UMIK-1 is easier to setup w/ REW. How so? Does REW automatically pick settings for it or something like that? Also, I think I read something about a driver for UMM-6...Does it need one? Where do you get it?

BTW, my laptop is on Win7 and has HDMI.

Thanks!
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post #60 of 84 Old 03-01-13, 08:51 PM
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Re: New Dayton Audio UMM-6 USB mic

The UMM-6 instruction manual does not indicate the need for a driver for Windows. I believe it is plug-and-play.

I do not know if the UMM-6 calibration file contains the sensitivity calibration number like the UMM-1 does. If not, an extremely accurate SPL calibration is not necessary. You can use a smart phone SPL measurement app and get in the ballpark, which is all you need for most room measurement work.
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