So, I am wondering how one can properly A/B test two DACs if one of them (or both) don't have any kind of volume control in the output stage. I understand the concept of using a multimeter and a signal gen to match the voltage on the DACs, but, if they don't have a way to volume control and both are going to an RCA A/B passive switch box, how to match them? Maybe two identical pre-amps before the switcher? But doesn't the preamp changes the results on that situation?
Thanks!
Thanks!