REW Beta Release REW API beta releases

John Mulcahy · Oct 19, 2025

TimoJ said:
When I select Spectrogram, first measurement shows this. Next one is OK and also the first one is OK after that. This started happening with the 103 version.

I'm guessing you have "Show slice at cursor" selected. If so, I have fixed that for the next build.

dcibel · Oct 19, 2025

John Mulcahy said:
Builds updated today (beta 101) with these changes:

Changed: When the FSAF excitation for a file measurement is saved there is also an "excfilt-" file which includes the effect of any filters applied

There's about 175ms timing offset when comparing the excfilt data to the EXC or LTI data. In any case, I don't think you need to keep EXCFILT, I don't think there' much to be gained from it that isn't already in the LTI response.

mandominguela · Oct 21, 2025

just finished installing REW but then it redirects me to this page telling me to download but i thought I already did, do i have to do it again?

John Mulcahy · Oct 21, 2025

This is the latest beta for the next release (5.40), the current release is 5.31.3, the version on the REW website.

Chuck Zwicky · Oct 22, 2025

Today's Beta:

Not responding to Key Command 'Measure"

John Mulcahy · Oct 22, 2025

Chuck Zwicky said:
Not responding to Key Command 'Measure"

Works for me.

armagedon · Saturday at 5:14 AM

Hello,
I’m not sure if I’m the only one seeing this, but when I run a measurement the impulse response is sometimes correct and sometimes not. All the other graphs look fine. only the impulse response is affected. I’ve attached screenshots to illustrate the issue:
this is ok:

this is not (measuring the same FL speaker):

I'm using an UMIK-2.
your help is appreciated.

moij · Saturday at 6:46 AM

Is possible that REW 5.40 b 102 creats incorrect EQ filters on Generic Extended model?
Measurements with REW generated EQ in DSP did not fit with REW predicted response, difference is until 10 dB on some frequencies.
On my DSP configuration tool I did not see resulting response, I can only measure. How is possible to check are generated EQ correct?

moij · Saturday at 11:17 AM

I find on REW EQ is option "Measure with these filters" what make measurement with EQ filters applied to sweep signal, this give very close result with predicted response. So problem is somewhere in EQ filter text export and import to DSP or in DSP.

Draki · Saturday at 5:08 PM

Do you export as text or biquad?
Is the sampling rate of the filter file export (biquads) matched to the DSP (e.g. 96 kHz, if you are using 96 in the 8C)?

HDTVTHR_Nut · Saturday at 6:41 PM

Hello John
Running V 5.40 Beta 103. Using the Alignment Tool, I Aligned 2 sub measurement with the delay slider. The Aligned Sum Measurement is created, however its text detail is missing the msec Delay value. Shouldn't it be included, I think it use to be? Here is the text.

Alignment Sum
Impulse alignment at 24.3 Hz
A = TW11 Minidsp2x4HD MLP S1S2
B = TW11 Minidsp2x4HD MLP S3S4
B polarity was inverted

Tim

moij · Sunday at 3:45 AM

Draki said:
Do you export as text or biquad?
Is the sampling rate of the filter file export (biquads) matched to the DSP (e.g. 96 kHz, if you are using 96 in the 8C)?

EQ-s exported as text, no biquads, on DSP and on REW sampling rate is 96 kHz. If I compare EQ-s on DSP and on REW, they are exactly same, Q-s, gains and frequencies fit 100%.

Circumbendibus · Sunday at 7:57 PM

Hi,
thanks for all the great work on this wonderful software! I am using the Beta 5.40 102 right now.
I have a question about the expected behaviour of the alignment tool:

The phase trace of the alignment tool is not affected by the "shift and update timing offset" function.
As you can see in the attached images, the timing offset of the measurement was shifted afterwards so that the phasegraph is readable, but when opening the alignment tool, the phase graph of the same measurement has all these extra phase wraps. Selecting and deselecting the Checkbox "Remove time delay" does not really make a difference, I would expect the same result as shift IR to Peak of the first measurement. The same timing offset should then be applied to the second measurement.

Maybe you can help me with this?
The .mdat file unfortunately is to lagre with 67 mb to attach here, but I can send a cloud link to it in a pm if needed.

I do also have an other wish:
The implementation of the d&b audiotechnik tuning filters is great, it makes this software much more usable in a pro audio environment.
Is it also possible to implement the filter definitions of the Powersoft Amplifiers and make it possible to import the Filtersets as .iqb directly into Armonia+, basically in the same way this is already possible with d&b R1.
I would even be happy if this is only part of the professional license, as this is something mostly professional users would need. This would be huge for me bc it is always a lot of pita to convert between the different filter definitions and keep track of which manufacturer uses which definitions.

Best
C.

John Mulcahy · Monday at 7:15 AM

armagedon said:
when I run a measurement the impulse response is sometimes correct and sometimes not.

Looks like a big clock rate error. In the measurement info you can see if a clock rate correction was applied, some missing data in the capture could cause an invalid correction.

John Mulcahy · Monday at 7:16 AM

HDTVTHR_Nut said:
The Aligned Sum Measurement is created, however its text detail is missing the msec Delay value.

There is no delay line if the delay is zero.

John Mulcahy · Monday at 7:20 AM

Circumbendibus said:
The same timing offset should then be applied to the second measurement.

Updating the timing offset changes the offset setting on the measure dialog, it would affect measurements made after the timing offset was updated, it has no effect on existing measurements.

John Mulcahy · Monday at 7:22 AM

moij said:
How is possible to check are generated EQ correct?

You could generate a measurement from the filter response using the option in the Filter tasks pane. It will be the same as the filter response you see in the EQ window.

armagedon · Monday at 9:01 AM

John Mulcahy said:
Looks like a big clock rate error. In the measurement info you can see if a clock rate correction was applied, some missing data in the capture could cause an invalid correction.

thank you for your response. I can see 128,2 ppm for the bad one:

The good one have -34 ppm.

This problem occur more frequently. What can you recommend to prevent this ?

John Mulcahy · Monday at 9:27 AM

It shouldn't occur at all. There's some possibility that a strong reflection is affecting REW's estimate of the timing signal locations, though that would be unusual. You can turn off the clock rate correction in the Analysis preferences.

armagedon · Monday at 10:12 AM

do you think it can be related to dirac ART, multiple speakers produce sounds to support the main speaker ?

John Mulcahy · Monday at 11:41 AM

The timing reference must only come from one speaker, if it is being sent to more than one it cannot work properly.

HDTVTHR_Nut · Tuesday at 12:18 AM

John Mulcahy said:
There is no delay line if the delay is zero.

Hello John
Here is a screen shot of simple example. There is a delay value on the Alignment Tool screen but not in the Aligned Sum produced measurement detail. I have Attached my mdat

FYI, i uninstalled REW and its preferences and reinstalled the current beta, problem persisted
Tim

John Mulcahy · Tuesday at 6:28 AM

HDTVTHR_Nut said:
Here is a screen shot of simple example. There is a delay value on the Alignment Tool screen but not in the Aligned Sum produced measurement detail. I have Attached my mdat

Thanks, I've tracked that down now and fixed it for the next build.

Breeman · 2025-10-29T15:39:34-0500

Hi John,

When working with EQ filters using drag and drop method on the latest build, the "Set graph axis limits" window randomly pops up. I am not sure what triggers it.

John Mulcahy · 2025-10-29T18:00:05-0500

Double click will bring that up.

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