John Mulcahy's latest activity
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John Mulcahy replied to the thread IMD Measurements: "Generator" vs "Input" Level Discrepancy.It would seem that would only be an issue if distortion levels at the start of the test are higher than those at the end of the test, so... -
John Mulcahy replied to the thread Can i run 2 SPL meters?.The logger only works on the first input. There are SPL meters for the first 4 inputs in the Tools menu. If you don't want the Pro...
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John Mulcahy replied to the thread REW Beta Release REW API beta releases.You can double click a measurement to make it the current selection, and use the Alt+up/down arrow keys to make the next or previous...
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John Mulcahy replied to the thread Excess Group delay show in overlay possible or maybe can add in future ?.Of course, it is a minimum phase response. You are using the wrong LF slope, the response will roll off according to the filter plus...
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John Mulcahy replied to the thread IMD Measurements: "Generator" vs "Input" Level Discrepancy.The AudioSystem getMixer method will throw that "mixer not supported" exception if it cannot find any audio mixers that match the...
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John Mulcahy replied to the thread Excess Group delay show in overlay possible or maybe can add in future ?.No, it doesn't, it shows the effect of you using an entirely inappropriate stimulus. An unwindowed burst has a lot of high frequency...
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John Mulcahy replied to the thread Excess Group delay show in overlay possible or maybe can add in future ?.Use the tails to correctly generate the minimum phase response, they let REW know how the response behaves at the lowest and highest...
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John Mulcahy replied to the thread REW Beta Release REW API beta releases.Builds updated today (beta 119) with these changes: Added: German translations of the interface courtesy of Andreas Lartz Added: The...
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John Mulcahy replied to the thread Low level when measuring subwoofer.Looks like the input is all zero, usually indicates that access to mic inputs is not permitted in the OS.
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John Mulcahy replied to the thread STI signal and measurement.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...
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John Mulcahy replied to the thread How can I get longer IR for limited-bandwidth sub measurements?.Sure, change the Analysis preferences below. REW adds 1 second before the IR peak, so the overall length would be 1 second greater than...
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John Mulcahy replied to the thread Frequency Normalized Distortion.It is doing it. Choosing the plot harmonics option forces use of harmonic as ref, so whether the THD plot changes depends on whether...
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John Mulcahy replied to the thread Frequency Normalized Distortion.Not really. From the help: Plot harmonics at the harmonic frequency changes the way the harmonic orders for sweep measurement...
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John Mulcahy replied to the thread Advise to interpret REW measurements.A mic fault is unlikely, but a very long USB cable could be a factor.
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John Mulcahy replied to the thread Generator Output High-Pass Filter??.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...
