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Forum: SPL Meters | Mic's | Calibration | Sound Cards   06-21-16, 01:22 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

The mic setting tells REW what kind of device is connected. It is independent of the SPL meter weighting setting. With the SPL meter on Z weighting you will see the influence of very low frequency...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   03-29-16, 04:38 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

I'd go with the UMIK. The UMM-6 can be a bit fragile.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   03-27-16, 12:38 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Yes, the UMIK-1 is still a great choice.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   01-04-16, 01:23 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

If you can use the mic with REW's Java drivers it should also work with ASIO4All.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   08-29-15, 04:18 AM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Open the files in textedit and copy the first line of the miniDSP file to the top of the Cross Spectrum file.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   08-21-15, 03:47 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

SPL calibration would not be needed if the cal file has the sensitivity data and the UMIK is selected as the input for REW, so REW 'knows' a UMIK is the input source.

The levels check is to make...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   08-20-15, 04:53 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Mic or Z Weighted SPL Meter

As the message says, the file does not have sensitivity data - Cross Spectrum don't include it. Download the miniDSP cal file for your mic and copy the first line from...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   05-04-15, 06:16 AM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

If the box is checked on the REW soundcard preferences to allow REW to control input volume and the volume setting is less than the 0 dB level REW will raise it to the 0 dB level when the input is...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   05-03-15, 06:41 AM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Yes, there isn't any benefit from using levels above 0dB since S/N isn't improved. By default REW sets the volume control to 0 dB.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   05-02-15, 12:17 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

The gain settings in the mic are affecting the analog front end gain, to keep the REW levels displaying correctly the sensitivity figure in the cal file needs to be adjusted correspondingly - so if...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   05-01-15, 02:39 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

The gain is set by switches inside the mic, there is a thread on how to do that here (http://www.avsforum.com/forum/155-diy-speakers-subs/1797489-massively-clipped-umik-1-a.html).
Forum: SPL Meters | Mic's | Calibration | Sound Cards   01-03-15, 08:00 AM
Replies: 886
Views: 242,250
Posted By JohnM
Re: Speaker Levels Calibration

The gain figure in the UMIK-1 device name comes from the device itself, it indicates an internal gain setting (which can be altered by opening the device should there be a need, would be unusual).
...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   01-02-15, 12:45 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

"OVER" means the input signal is clipping. You can clear that by clicking on the OVER indicator, but it means input levels are too high. Odd to have that on a UMIK-1 since it would indicate very high...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   12-01-14, 04:13 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Yes, if you have the UMIK selected as the input device and Microphone (or similar) selected as the input and the cal file has the sensitivity figure as the first line.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   12-01-14, 03:09 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Turn down the input volume setting on the UMIK.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   02-06-14, 01:46 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Can use either, analog outputs don't usually suffer from roll-off within the range of interest for audio measurements.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   02-03-14, 03:24 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

The mic serial number is in the cal file, would have to ask MiniDSP to find out what happened with the batch that had incorrect data.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   02-03-14, 03:19 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

That seems a bit strong, there seems to be a batch that have been supplied with the same cal file, which is clearly wrong and no doubt the subject of some tense discussion between MiniDSP and the...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   02-03-14, 03:13 PM
Replies: 886
Views: 242,250
Posted By JohnM
Forum: SPL Meters | Mic's | Calibration | Sound Cards   02-01-14, 06:03 AM
Replies: 886
Views: 242,250
Posted By JohnM
Forum: SPL Meters | Mic's | Calibration | Sound Cards   11-21-13, 02:01 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

MiniDSP suggest up to 5m should be OK, see http://www.minidsp.com/forum/umik-questions/7477-re-umik-max-cable-length

Sure.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   10-20-13, 03:39 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone setup issue

You need to install the Java runtime if you don't already have it, then the REW OS X app bundle from this thread...
Forum: SPL Meters | Mic's | Calibration | Sound Cards   10-16-13, 01:32 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

I generally leave it at 0 dB.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   10-15-13, 06:27 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

If you go all the way to +24 in a very quiet environment you will see the effect of the extra gain on the output noise level of the mic electronics.
Forum: SPL Meters | Mic's | Calibration | Sound Cards   10-15-13, 01:57 PM
Replies: 886
Views: 242,250
Posted By JohnM
Re: MiniDSP UMIK-1 Microphone

Shouldn't matter, REW compensates for the Windows volume setting, but make sure you use REW V5.01 beta.

Correct

No, that is to produce plots that are more easily compared with sweeps. Just read...
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