You must short the input connector of the A21 (it is normally closed by output impedance of the preamp or DAC). Pin 2 and 3 of XLR to pin 1. Or short the RCA input. If you do not do it, input is open, sees the input impedance (resistor noise + EMI coupling). You need to fulfil basics to make valid experiments. Sorry I will leave the PC now
, we go to elementary.
I guess this is not really class A vs AB issue?
Apologize to everyone ahead of time for prolonging this side discussion.
Just to be clear, what you want me to do is this:
If I connect via RCA from my preamp to Parasound, I need to connect shorted XLR cables to the XLR inputs.
If I connect via XLR from my preamp to Parasound, I need to connect shorted RCA cables to the RCA inputs.
Am I correct?
Can I do this instead? Would this also close all inputs of my Parasound?
Connect from preamp #1 (stereo preamp that connects to my DAC) via RCA. This is the preamp that plays music.
Connect from preamp #2 (my AV preamp) via XLR. I will use the preamp xlr channels that do not play any music notes.
Thanks!