Recent content by dlr

Thanks.

I am testing several microphone setups. One has a separate stand-alone mic preamp (unbalanced) with a calibrated Panasonic electret mic capsule. The mic output will feed a sound card unabalanced input. REW has options for sound card and mic calibration files, but nothing for a separate mic...

It would be convenient to have the "Measure to plot" selection as arrows (up and down) beside the harmonic selected for display rather than in the Controls window. I tend to leave the controls out of view, so any changes requires opening the Controls window. I know it's a minor thing, but it...

Back again. I'm using my relatively new Windows 11 laptop now. FlexASIO worked fine with the Umik-2, but I realized that the same issue occurred, not recognized as USB mic. So I tried switching to Java in REW again. The Umik-2 is not even seen by the Java driver. The ASIO works without issue...

I had considered that, but I bought it partly for the absolute SPL calculation, partly for the distortion capabilities. If there is an issue with the low end, it may be the mic, may be the the cal supplied. If it's the cal, then yes, I can amend it to align. If it's the mic, then amending the...

Yes, I am using the cal file. It shows about 5dB correction needed at 20Hz, but with the correction it's down another 5dB at 20Hz. I tested this. Removed the cal file. The error was 10dB down. Edit: I labored for weeks using the Umik-2 as reference until I compared the 2004 measurement to the...

I purchased a miniDSP Umik-2 to have as a calibrated mic that also would be used for some distortion meaurement of drivers. I also have other measurement systems with other microphones. One is calibrated and dedicated through a supplied preamp. I also have a 25+ year old hand-built wand mic...

I switched to the Java drivers. Works fine that way. Better in fact. I've been having occasional glitches during STHD and multi-measurement averages. Possibly due to the old laptop with FlexASIO I've been using. So far the Java driver has not exhibited that.

I'm using FlexASIO. I just saw that it had "Microphone" for input device, I changed that to "Line (Umik-2)". The Windows setting had been and is "Line (Umik-2)". I set FlexASIO Input to Umik-2. It seems to load now, no message popup. Just ran a new measurement. The db level _seems_ to be what I...

I load the UMik-2 cal file using the measurement dialog "Calibration files..." that brings up Calibration data window. After entering the file the window pops up a message "The cal file has a Sens Factor entry but the input is not a recognized USB mic. The Sens Factor will not be used. " The...

Ah yes, and I see that with the Info popup open that hot key also moves the Info through the measurements as well. Thanks. Very nice. Much better than my idea.

The info popup window evidently displays the data for the "current selection" which is the from the last action taken, measurement, open, change current selection, etc. It took a while for me to figure that out while I was in the Overlays window. I at first thought that it would be for the last...

Ah, I had no clue. Thanks, I'll check that out.

John, The March 2026 edition of audioXpress has an interesting article on transducer distortion and measurements. It's by Steve Temme of Listen, Inc. who proposed a distortion measurement algorithm (1993) he called Frequency Normalized Distortion. He explains and demonstrates in the article...

No, I had not changed the Overlays Y axis. Thanks.