@fsmithjack
Your Bricasti M1SE DAC has adjustable output.
quote from manual
"
The next stage, at the analog out of the converter for the gain and filter sections there is a fully differential analog design with fast high slew rate analog operational amps. This is followed by 2 transistor designed output buffer sections, balanced and unbalanced, each separately buffered and isolated. The balanced output level as shipped is set with a fixed resistor at +13.5 dbm. For custom level matching, an internal the jumper on the board can be moved to engage a precision adjustable potentiometer. This adjustment is set from the rear panel screw near the XLR connector. When the potentiometer feature is engaged the level is adjustable from +8 to +23 dbm and can be referenced to a fraction of a db to match any setup. This level is set as a default +16 dbm at the factory so when the jumper is engaged this will be the new level. Please contact us for detailed instructions on how to change and set these levels. The unbalanced is set to normal hi fi levels of 2V RMS (+8dbm) by precision resistor values on the board."
You should check check to see what you have set. It is possible you may be sending too high of a signal to your amplifier and therefore clipping and massively distorting the input stage ...
At +22dbm the balanced XLR output voltage will be about 18 volts which is a pro audio signal and too much for most consumer grade amplifiers.