Recent content by kpjamro

You can buy a calibrator device for your SPL meter. These make 114 dB at 1 kHz and sometimes other levels like 94 or 104 dB. Cost is 100 USD and upwards.

MiniDSP technical help says that clipping/compression normally starts at 110 dB. This can be increased, but results in less sensitivity at the low end. Having the 110 number on the spec sheet would be useful. This is with a single tone, which I suppose is kind of a worst-case scenario, It's...

I have to say the cause of this was disconnecting and reconnecting the microphone as mentioned in one of the replies. You can, in fact, change the windows gain on the fly.

OK more experimenting. Selecting line input w/o EXCL raises the indicated reading by about 2.5 dB for both 94 and 114 input levels.. But the reading at 94 is about 2.5 too high so I guess that is not a good idea. I can watch the REW SPL meter as I adjust the volume slider in Windows and see...

It seemed that setting the input volume to 33% had no effect on REW. But when I closed down and then later restarted REW it started giving the expected 94 dB. I guess you cannot change it 'on the fly' (?) I have seen other comments in forums that these mics saturate around 115 dB. Results at...

More info. I found an additional spec that says the sensitivity of the mic is -31.9 dBFS at 94 dB. Playing with Audacity, I found that an input volume setting of 33 percent gives -31.9 dBFS with my calibrator running at 94 dB (dBFS in Audacity using the Wave Stats add-in function). Writing to...

John thanks for the fast reply. I had windows gain set at 0 which I was hoping was actually zero, not +10, but who knows... Today I connected the UMIK directly to the desktop and compared to my SPL meter. Calibrator = 114 dB / SPL meter=114.0 dB / UMIK/REW=114.4 dB sounds nice but Calibrator...

I am having a related issue. I insert my UMIK-2 into my calibrator source set for 94 dB and record some audio on a laptop (using Audacity). I am running 48ksps and 32-bit. When I import the audio from the laptop into REW (and use the calibration file) REW tells me the level is 104 dB, This is...