Recent content by John Mulcahy

REW's STI calculation uses the indirect method, so it uses an impulse response. You can get that by making a sweep measurement. The STI panel has buttons to measure signal and noise levels to use for post-processing, or it can calculate the signal levels from the IR, or you can use the RTA in 1...

Sure, change the Analysis preferences below. REW adds 1 second before the IR peak, so the overall length would be 1 second greater than the retained portion. REW zero-pads FFTs to retain high resolution even for shorter windows, but a long enough window will further increase the resolution of...

It is doing it. Choosing the plot harmonics option forces use of harmonic as ref, so whether the THD plot changes depends on whether that was already selected or not. Plot harmonics does what it says on the tin, changes how harmonics are plotted.

Not really. From the help: Plot harmonics at the harmonic frequency changes the way the harmonic orders for sweep measurement distortion are plotted - rather than plotting the distortion at the frequency of the fundamental it is plotted at the frequency of the harmonic, so (for example) the 2nd...

A mic fault is unlikely, but a very long USB cable could be a factor.

Difficult to be sure what you are referring to or what you did when you measured the output. You can see the REW stimulus on the Captured graph after you make a measurement. It doesn't have a high pass of any sort. Every speaker does, of course.

That's the "Use harmonic frequency as ref" option.

How long is the FSAF file? Does the Measure dialog open in FSAF mode when you get the delay or is it in SPL mode? Is there a Busy indicator shown during the delay?

Yes, please.

Doesn't give me much to work with. Every time you open the Measure dialog or only the first time? What are your Measure dialog settings for SPL, FSAF and Impedance? Anything else you can say about when this happens?

Clock adjustments are all over the place, anywhere from -3 ppm to -255 ppm. That will alter the shape of the IR but won't change the energy, so the frequency response is not affected. Difficult to say why the adjustments are varying, perhaps there are dropouts in replay or capture.

No need for a video, problem has already been fixed.

I guess the level was -3 before you changed it to -9.7? I have fixed it for the next build.

Are you sure the Overlay graph had the Y axis set to SPL? The SPL offset doesn't affect other axis choices.

How are the names displayed if you use beta 113?