• Welcome to ASR. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Partitioned convolution discussion

So the signal went through the same Blackhole device twice?
Not exactly.
1) REW sends sweep to BlackHole output ch. 1
2) Reaper acquires BlackHole input ch. 1 (looped back from REW)
3) Reaper is configured to reroute audio to BlackHole output ch. 2
4) REW acquires BlackHole input ch. 2 (looped back from Reaper)

There is no overlap if that is your doubt.

It is only in this precise configuration that the signal degrades.
If I play the REW's sweep with another app, like Apple Music or Audacity or any other player, and use the double loopback config as said before, everything works normally: THD+N below -140dbfs.

It's pretty weird and I think it depends on how REW handles drivers or how Core Audio works.

But that's not the only anomaly with REW: I have noticed that in direct loopback measurements via Blackhole (ch1 out to ch1 in), if I start signal generation first compared to the acquisition of RTA, it is not possible to use a rectangular window, there is a lot of noisefloor fluctuation. As if there was a clock problem. But if I do the opposite, first I start RTA and then the generator, all perfect.
I suspect that the problem with the measurement via sweep is correlated and depends on the opening of the devices.
 
Last edited:
Back
Top Bottom