MiniDSP UMIK-1 Microphone - Page 14 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #131 of 887 Old 01-10-13, 04:20 PM
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Re: MiniDSP UMIK-1 Microphone

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Gilles27 wrote: View Post
I just got my umik1 and I'm having the same problem.
Please also include which OS you are running and which version of REW, and have a look at the REW log files (location is shown in the Help -> About box) and see if they contain an entry that states a figure for Mic Sensitivity, and what that figure is.
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post #132 of 887 Old 01-10-13, 04:49 PM
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Re: MiniDSP UMIK-1 Microphone

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Please also include which OS you are running and which version of REW, and have a look at the REW log files (location is shown in the Help -> About box) and see if they contain an entry that states a figure for Mic Sensitivity, and what that figure is.

I'm running REW 5.01 beta 12 build 2849.

OS is Windows 7 64 bit.

There's the following entry in the logs:

??? 10, 2013 5:00:48 PM roomeqwizard.CalData calFileLoader
INFO: Mic sensitivity -15.188 dB

That is also the sensitivity value in the cal file.
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post #133 of 887 Old 01-10-13, 04:54 PM
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Re: MiniDSP UMIK-1 Microphone

Thanks for that. Please try setting the input volume control in REW to 1.0 and see if that changes the SPL reading you get when the room is quiet, please also let me know approximately what value is shown in the DB Fs gauge below the SPL figure, it will be varying so a rough figure is fine.
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post #134 of 887 Old 01-22-13, 12:17 PM
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Re: MiniDSP UMIK-1 Microphone

Im confused about the hdmi connection option. I though the microphone where connected by USB?
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post #135 of 887 Old 01-22-13, 12:31 PM
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Re: MiniDSP UMIK-1 Microphone

The Mic in USB for audio in. If your computer has a HDMI connection, you can use that for audio out, to your amp or receiver.
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post #136 of 887 Old 01-22-13, 12:44 PM
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Re: MiniDSP UMIK-1 Microphone

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The Mic in USB for audio in. If your computer has a HDMI connection, you can use that for audio out, to your amp or receiver.
Thank you for explaining this mate. Much difference to just using the normal left/right aux in on the AVR?

I wonder how this microphones accuracy compares to the Premium+ calibrated Cross-Spectrum Dayton EMM-6 that i currently own and if it's worth getting the UMIK-1? Well i guess we'll only know for sure with time.

It sure is handy not having to find and set the external soundcard/preamp and attach adapters each time i want to do a measurement.
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post #137 of 887 Old 01-22-13, 02:20 PM
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Re: MiniDSP UMIK-1 Microphone

Just did a quicky test with umik-1 Mic and a borrowed radio shack analog spl meter. Windows 7 32-bit, hdmi out audio, REW beta 13. Put the spl meter in REW on C-weighted, and well as the radio shack meter. The readings from both were mostly within 2 db at the frequencies I tested from 20hz-20,000hz. I also changed the mic input volume in REW to different levels and all spl readings stayed the same at given frequencies. Thanks for all your work John, I love this software.
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post #138 of 887 Old 01-23-13, 04:50 PM
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Re: MiniDSP UMIK-1 Microphone

I have purchased a UMIK-1 and has done some measurements in REW (beta 13) under Windows 7. The results are very strange compared to measurements with my Behringer ECM8000. The frequency response curve rises with more than 30 dB from 40 Hz to 1.5 kHz (I've tried both with and without the UMIK calibration file). This is with subs and Audyssey MultEQ XT32 calibration enabled, so I would expect a pretty flat curve down to about 30 Hz. The ECM8000 curve is much flatter. See attached image for measurement curves.

Any help on what might be the problem is much appreciated.
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MiniDSP UMIK-1 Microphone-umik.png  


Last edited by phazer99; 01-23-13 at 04:57 PM.
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post #139 of 887 Old 01-23-13, 09:31 PM
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Re: MiniDSP UMIK-1 Microphone

Is it possible that your sound card's output stage has that much low-frequency rolloff? If it does, and you have run sound card calibration for use with the Behringer measurement mic, that rolloff would not show up in the upper curve but would show up in the lower curve which does not include any calibration for the sound card output stage. That is the only explanation that I can think of.

Note: That is a lot of rolloff, perhaps there is some other signal processing going on in the computer that you are not aware of.

Last edited by AudiocRaver; 01-23-13 at 09:34 PM. Reason: Added note
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post #140 of 887 Old 01-24-13, 02:43 AM
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Re: MiniDSP UMIK-1 Microphone

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AudiocRaver wrote: View Post
Is it possible that your sound card's output stage has that much low-frequency rolloff? If it does, and you have run sound card calibration for use with the Behringer measurement mic, that rolloff would not show up in the upper curve but would show up in the lower curve which does not include any calibration for the sound card output stage. That is the only explanation that I can think of.

Note: That is a lot of rolloff, perhaps there is some other signal processing going on in the computer that you are not aware of.
I don't think that's the problem, I'm using the SPDIF output of the Realtek sound device on my motherboard and all effects are turned off. It's the same output I use for all sound playback in Windows. I don't use any soundcard calibration file in REW, neither for the Behringer or the UMIK.
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