dac settings

I first noticed something was amiss, when I measured my new JBL A130, and saw a bizarrely similar frequency response (fr) to what my old Technics SB-P1000 were producing. The measurements also didn't correlate nicely with what'd been measured here. Fast forward a while and much exasperaish...

Hey, I noticed on the JDS Labs setup instructions for the Atom DAC that it says to keep Windows volume just below max, but it says to set the sample rate to the highest multiplier of the source material. I've seen a lot of conflicting information saying to keep it at 24 bit 48khz for things...