Recent content by JohnPM

It isn't, few are. The cal file usually contains the response of the mic.

The calibration file compensates for the response of the mic in the presence of a signal. At very low signal levels the mic's self-noise will become the dominant component and the calibration file would no longer be appropriate.

Acoustic ref with a USB mic using a separate speaker to the one being measured can provide a stable reference even for off-axis measurements within the limits of the mic, but an analog mic and a loopback connection are better. Lack of (or unreliable) response calibration data has been an issue...

To see the noise floor tick the "Capture noise floor" box on the Measure dialog and look at the result on the Distortion graph. REW can tell you the frequencies and decay times of resonances in a measurement.

That would be a never-ending job.

UMIK-1 and UMIK-2 are individually measured and calibrated. They are not batch measured, posts claiming that are baseless speculation. I visited miniDSP's facilities on several occasions back in the days I used to travel to China regularly.

No. The location of the timing signal (or signals if clock rate correction is enabled) is determined by cross correlation of the signal data with the captured data.

Yes, but REW doesn't allow filter centre frequencies below 10 Hz in equalisers. There is a high pass option on the Soundcard preferences, that applies a 2 Hz first order filter.

The response looks typical of one where a measurement is being used as cal data. You have selected "Use loopback as cal and timing reference" but from your system description it doesn't look like there would be a way to have a loopback cable connected, which from your selections would need to go...

Some DACs mute both outputs if the left channel is silent. Try selecting "Fill silence with dither" in the Options on the Measure dialog.

Choose the device name that doesn't start with EXCL.

Read further than the first few lines, the help shows settings to use including:

Rectangular can be used when input and output share the same clock. If they don't (if they are different devices) a window is required as there will be small differences in clock rates. Hann at 75% overlap with at least 4 averages or other windows at 87.5% overlap with at least 8 averages, for...

Individual room resonances are often not sufficiently isolated to make it easy to see the effect of an individual EQ filter, but here is an example where that is the case. The after plot is the result of a single EQ filter, Fc 50.00 Hz, Gain -15.00 dB, Q 11.881 targeting a modal resonance with a...

On macOS REW uses the sample format specified in the Mac's Audio Midi Setup utility for the interfaces being used. There is no 16-bit limitation. REW cannot control the interface sample rate on the Mac so the rate in Audio Midi Setup should match the rate in REW otherwise the OS will resample...