Re: Smaart 7 audio interface
I have. It did not work very well. It has been a few months so I do not remember the specifics, but there is a problem routing noise into the console (to feed to device under test) and back into the console (for the reference signal). Somewhere along the line I determined I had to use an aux bus to return signal to Smaart via the USB. Depending on the routing the resultant measurement had a huge HF roll-off or there was massive comb filtering.
My seat-of-the-pants guess is that they are using different model ADC and or DAC for the aux sends, and they have differing latencies. The latency difference is on the order of 1 ms or less. It's fine for general music playback, but no good at all for measurement.