MiniDSP UMIK-1 Microphone - Page 13 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #121 of 887 Old 01-08-13, 03:11 PM
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Re: MiniDSP UMIK-1 Microphone

Quote:
thed1ceman504 wrote: View Post
1st Problem:
On both Mac (REW v5) and Windows (latest REW beta), the SPL readings appear to be way off. In my quiet apartment, the UMIK reports about 65-75 dBSPL, C-weighted. I have a standalone SPL meter which reads about 10-15 dB below this. I would tend to trust the calibration on the UMIK over my cheap SPL meter, but I think the UMIK reading is way to high for just the ambient noise level. These measurements were taken with the UMIK cal file loaded in to REW in both Mac and Windows.
The OS X version of REW (V5.0) does not know about UMIK-1, SPL readings for OS X need to be calibrated using the procedure in the help (Calibrating the SPL Reading).

For the Windows version (assuming V5.01 beta 11 or later) did REW automatically detect the UMIK and ask if you wanted to use it? If not, please set the input device back to default on the REW soundcard preferences then shut down and restart REW, it should ask if you want to use the UMIK-1 and then ask for the cal file. If you had already done that, please post a screenshot of the REW soundcard preferences dialog.

Quote:
2nd Problem:
When using the UMIK and REW on Mac, REW reports that the UMIK is clipping when taking measurements. This happens even when using my Macbook speakers for output, so I'm sure the sound pressure is not actually exceeding the range of the UMIK. I tried adjusting the UMIK level in the Mac OS MIDI Setup, but it did not appear to have any effect on the results. I am using a 128k sample length for these measurements.
Is the UMIK selected as the default device and REW set to use the default input?
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post #122 of 887 Old 01-08-13, 03:50 PM
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Re: MiniDSP UMIK-1 Microphone

John, do you plan to have the Umik 1 integrated into the Mac version of REW in the future?
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post #123 of 887 Old 01-08-13, 05:02 PM
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Re: MiniDSP UMIK-1 Microphone

Yes, but I need to get hold of a way to run the latest OS X release first (which I'm working on). There are likely to be limitations in the SPL calibration though - under Windows REW can read the input volume control setting and take it into account in the SPL figure, but under OS X the Java runtime does not provide access to the volume controls. There is a chance that the Oracle Java runtime has addressed that, however.
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post #124 of 887 Old 01-08-13, 07:57 PM
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Re: MiniDSP UMIK-1 Microphone

Thanks John. This Mic and it's simple plug and play (at least for Windows) has persuaded me to get into room measurement. I am sure that many who were sitting on the fence will also jump in.
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post #125 of 887 Old 01-08-13, 10:35 PM
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Re: MiniDSP UMIK-1 Microphone

Hi John,

Thanks a lot for your reply.

Quote:
JohnM wrote: View Post
The OS X version of REW (V5.0) does not know about UMIK-1, SPL readings for OS X need to be calibrated using the procedure in the help (Calibrating the SPL Reading).

For the Windows version (assuming V5.01 beta 11 or later) did REW automatically detect the UMIK and ask if you wanted to use it? If not, please set the input device back to default on the REW soundcard preferences then shut down and restart REW, it should ask if you want to use the UMIK-1 and then ask for the cal file. If you had already done that, please post a screenshot of the REW soundcard preferences dialog.
Yes, REW did automatically detect the UMIK on the Windows version. I clicked yes and loaded the cal file. I did not change any other preference settings away from their default. Unfortunately, I was borrowing a Windows laptop and can't get a screenshot for you.

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Is the UMIK selected as the default device and REW set to use the default input?
On the input clipping when using REW on Mac - I was previously changing the input device in the REW soundcard preferences from 'default' to the UMIK, then running sweeps. Now, I tried selecting the UMIK as the default input device in the Mac OS System preferences, and then starting REW. I now receive an error when REW starts, which says: "Unable to access the selected device
javax.sound.sampled.LineUnavailableException: Unexpected Error". I am using Mac OS X 10.8.2 on a 2010 Macbook Pro.

Maybe REW was never actually using the UMIK (rather, built-in mic instead) when I was experiencing the clipping in Mac OS?
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post #126 of 887 Old 01-09-13, 12:43 PM
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Re: MiniDSP UMIK-1 Microphone

Ok I know this has been asked many times, but I'm just trying to make sure I have the mic configured properly for the SPL meter in REW and also to reflect correct spl reading on FR plots. Everything is setup and working, but the spl measurements seem much higher than I would have guessed. I have a PC with windows 7, hdmi out to receiver, miniDSP usb mic in, and REW beta 12. The 2 volume adjustments for input volume of the mic are the windows mic volume control and the input volume control in REW. What should I have both of these values set at for correct readings? Thank you
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post #127 of 887 Old 01-09-13, 02:40 PM
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Re: MiniDSP UMIK-1 Microphone

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The 2 volume adjustments for input volume of the mic are the windows mic volume control and the input volume control in REW. What should I have both of these values set at for correct readings?
They should both be showing the same thing, except the Windows control goes from 0 to 100 and the REW control from 0 to 1, so 53 on the Windows control (for example) should be appearing as 0.53 in REW. If they are both showing the same then it doesn't matter too much what they are set to, anywhere between 0.5 and 1.0 should produce the same SPL reading for the same signal. If you are measuring 'normal' levels (not trying to measure maximum output of your sub, for example) set the control to 1.0 in REW or 100 in Windows, but if you need to measure levels above 110dB use 0.53 / 53.
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post #128 of 887 Old 01-09-13, 02:41 PM
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Re: MiniDSP UMIK-1 Microphone

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Maybe REW was never actually using the UMIK (rather, built-in mic instead) when I was experiencing the clipping in Mac OS?
Possibly. It is worth trying different sample rate settings in REW (44.1k and 48k) to see if that helps.
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post #129 of 887 Old 01-09-13, 04:21 PM
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Re: MiniDSP UMIK-1 Microphone

Quote:
They should both be showing the same thing, except the Windows control goes from 0 to 100 and the REW control from 0 to 1, so 53 on the Windows control (for example) should be appearing as 0.53 in REW. If they are both showing the same then it doesn't matter too much what they are set to, anywhere between 0.5 and 1.0 should produce the same SPL reading for the same signal. If you are measuring 'normal' levels (not trying to measure maximum output of your sub, for example) set the control to 1.0 in REW or 100 in Windows, but if you need to measure levels above 110dB use 0.53 / 53.
Awesome, thank you John
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post #130 of 887 Old 01-10-13, 03:16 PM
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Re: MiniDSP UMIK-1 Microphone

Quote:
JohnM wrote: View Post
The OS X version of REW (V5.0) does not know about UMIK-1, SPL readings for OS X need to be calibrated using the procedure in the help (Calibrating the SPL Reading).

Quote:
thed1ceman504 wrote: View Post
Hi Everyone,

I am having some issues with my UMIK-1 and hope some of you might have some helpful advice.

1st Problem:
On both Mac (REW v5) and Windows (latest REW beta), the SPL readings appear to be way off. In my quiet apartment, the UMIK reports about 65-75 dBSPL, C-weighted. I have a standalone SPL meter which reads about 10-15 dB below this. I would tend to trust the calibration on the UMIK over my cheap SPL meter, but I think the UMIK reading is way to high for just the ambient noise level. These measurements were taken with the UMIK cal file loaded in to REW in both Mac and Windows.
For the Windows version (assuming V5.01 beta 11 or later) did REW automatically detect the UMIK and ask if you wanted to use it? If not, please set the input device back to default on the REW soundcard preferences then shut down and restart REW, it should ask if you want to use the UMIK-1 and then ask for the cal file. If you had already done that, please post a screenshot of the REW soundcard preferences dialog.

Is the UMIK selected as the default device and REW set to use the default input?


I just got my umik1 and I'm having the same problem.
REW recognized the mic and asked if I want to use it and then asked for the cal file which I loaded.
When using the spl meter I'm getting 70-75 db of ambient noise level, which can't be right.

I have an aperion audio spl meter, which as far As I know is the same as the analog RadioShack meter, and when setting that to the lowest db scale (60db) the needle doesn't even move.

I don't have accesses to the mic right now but I will post a screenshot of the sound card preferences tomorrow.

Looking forward to messing around with REW and the minidsp. That's a winning combination
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