While working on trying to setup my two UM18s with the iNuke6000DSP I noticed something strange, that I was hoping if anyone might have an idea what is causing them.
My UMIK is the one that comes with 18dB gain (or so it shows in Windows).
I was using the ASIO driver in REW
First - I setup the UMIK mic level in the Windows recording properties to 10% (~5dB) as per the Guide to REW document I followed. While testing with this, I decided to try to play a Pink Noise with the Generator at -30dBFS and randomly raised my AVR volume to a loud level but nothing specific, and wanted to compare REW SPL Meter (dBC slow SPL ) readings with my external SPL meter I bought from The Source. The reading in REW were about 10dB different. Playing with the Gain slider in Windows did not seem to have any effect on what the REW SPL was showing.
I then opened the logger from the REW SPL meter and what I noticed is that the logger does seem to be affected by the gain setting from Windows, e.g. I had to change the gain to about +11.3 dB in order to match the REW SPL Metter Logger readings with my external SPL meter, but the reading on the REW SPL screen (not the logger) were still the same (about 10 dB off).
To summarize:
- I had to bump the mic gain in Windows to about +11.3 dB to get the same reading on my external SPL meter as the one showing in the REW SPL Logger screen. Is this normal .. the guide mentions +5 dB, but maybe my UMIK comes with a different gain ?
- Even when I get the REW SPL Logger graph to match the reading on my external SPL, the REW SPL main reading screen was still showing something lower (even though the logger wasn't). I have no idea why they would be different ?
My UMIK is the one that comes with 18dB gain (or so it shows in Windows).
I was using the ASIO driver in REW
First - I setup the UMIK mic level in the Windows recording properties to 10% (~5dB) as per the Guide to REW document I followed. While testing with this, I decided to try to play a Pink Noise with the Generator at -30dBFS and randomly raised my AVR volume to a loud level but nothing specific, and wanted to compare REW SPL Meter (dBC slow SPL ) readings with my external SPL meter I bought from The Source. The reading in REW were about 10dB different. Playing with the Gain slider in Windows did not seem to have any effect on what the REW SPL was showing.
I then opened the logger from the REW SPL meter and what I noticed is that the logger does seem to be affected by the gain setting from Windows, e.g. I had to change the gain to about +11.3 dB in order to match the REW SPL Metter Logger readings with my external SPL meter, but the reading on the REW SPL screen (not the logger) were still the same (about 10 dB off).
To summarize:
- I had to bump the mic gain in Windows to about +11.3 dB to get the same reading on my external SPL meter as the one showing in the REW SPL Logger screen. Is this normal .. the guide mentions +5 dB, but maybe my UMIK comes with a different gain ?
- Even when I get the REW SPL Logger graph to match the reading on my external SPL, the REW SPL main reading screen was still showing something lower (even though the logger wasn't). I have no idea why they would be different ?