Getting loop back timing to work

[Wavetrain]

I trying to setup a rig for ongoing speaker testing & don’t want to perform a seperate timing reference each time. I have a couple of usb audio interfaces (with balanced outputs that I need) which I have tried to setup using a Umik-1. No issue outputting a test signal & performing measurements, but I can’t get the loopback to work as a timing reference on either device. I am obviously missing something obvious. Could someone point me in the right direction or thread or guide where this has already been deal with.

Thanks

 

[John Mulcahy]

You can't use a loopback with a USB mic as the mic doesn't have an input for the loopback connection. Using two different input devices won't work as operating systems do not provide any synchronisation between devices.

 

[Wavetrain]

Thanks. Thought that might be the case, I just couldn’t find it stated anywhere. I’ll use another mic. Was trying to avoid that, as I’ll need to generate a cal file for it.