REW 5.20 RC4 sweep length causing frequency response issues..?

Chuck Zwicky

New Member
Thread Starter
Joined
Sep 8, 2017
Messages
42
I have run into some anomalous results when performing some simple frequency response sweeps. I restarted REW to see if that would fix the issue, and I tried 2 different interfaces, a Thunderbolt UA Apollo and a USB Arturia AudioFuse.


Interface 1 Arturia Audiofuse Studio:

1M sweep 0-22.05kHz

1 rep: 11kHz response:

38493


1M sweep 0-22.05kHz

2 reps: 16kHz response:

38494


512k sweep 0-22.05kHz

12.2kHz response:

512k sweep AFS.jpg



256k sweep 0-22.05kHz

1 rep: 2.4kHz response:

256k sweep AFS.jpg



256k sweep 0-22.05kHz

4 reps: 20kHz response:

256k sweep - 4 reps AFS.jpg





Interface 2 UA Apollo Twin:

1M sweep 0-22.05kHz

1 rep: 20kHz response:

38495



512k sweep 0-22.05kHz

1 rep: 17kHz response:

38496


256k sweep 0-22.05kHz

1 rep: 3.3kHz response:

38497



128k sweep 0-22.05kHz

1 rep: 725Hz response:



38498
 

John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
7,212
Early cutoff of the response can have two causes: the capture missing the end of the sweep due to excessive replay and/or capture latency and the REW sample rate not matching the rate the device is set to in Audio Midi Setup. Reducing the REW buffer size setting in the soundcard preferences might help with latency issues, but the most reliable cure for that is to use the acoustic timing reference option, which ensures capture doesn't start until the timing signal is detected.
 

Chuck Zwicky

New Member
Thread Starter
Joined
Sep 8, 2017
Messages
42
REW 5.20 RC 6

When making a screenshot the comment alignment is greyyed out when Comment position "On Image" is selected.

40282


In a possibly related issue, the comment can obscure the THD window of the RTA, for example:

40283
 

John Mulcahy

REW Author
Joined
Apr 3, 2017
Messages
7,212
Comments on the image are always centred. For lengthy comments and/or to use html formatting choose the above or below image option.
 
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