RPi + CamillaDSP with weird SPL

[bcXxx]

Thanks to the author of https://github.com/HEnquist/camilladsp and https://www.audiosciencereview.com/forum/index.php?threads/rpi-camilladsp-tutorial.29656/ , I figure out how to combine the subwoofer to bookshelf speakers on desktop.

And when I am using REW to figure how to setup the lowpass and I pass, I suddenly curious to know if I took the output of the DAC as the input to the recorder, what will I got,
So, I got the red light of the below picture, the sample rate is 192000, looks very weird, So I change the sample rate to 48000, I got the green one, And then I bypass the camilladsb, pc out put to the dac directly, I got the blue one

What happen about the red one, is that normal? or what I test doesn't make sense? Thanks, I am a newbie

 

[staticV3]

What happen about the red one, is that normal?

No.

Try using the RPi as source device outside of USB gadget mode.

You can export a measurement sweep as .WAV in REW's generator, then play that back locally on the RPi.

That being said, your plan of using two DACs connected via USB is prone to issues.

USB means that the two DACs will have slightly different timing, and that timing will change over time (clock drift).

Consider using a single 4ch DAC.
That way, your subwoofer will play in sync with your Mains.

 

[bcXxx]

No.

Try using the RPi as source device outside of USB gadget mode.

You can export a measurement sweep as .WAV in REW's generator, then play that back locally on the RPi.

That being said, your plan of using two DACs connected via USB is prone to issues.

USB means that the two DACs will have slightly different timing, and that timing will change over time (clock drift).

Consider using a single 4ch DAC.
That way, your subwoofer will play in sync with your Mains.

Oh, I see, Thank you very much