To follow up on my testing, I did not have good results setting Strawberry volume slider to 50 percent, if that, indeed, equates to -3 dB.

70 percent seemed better to my ears. Computer master volume remained at 100 percent. DAC is connected to my computer via USB.

Incidentally, on further reading about this topic, the term(s) used is "intersample peak clipping", or "intersample overs".