lithiumnk
500+ Head-Fier
That's detail dwg. Thanks.
I have a/bed with unbalanced/balanced connections. I believe there is a difference.YMMV. (Astell & Kern used to have a 2.5mm + 3.5mm cable to XLR(L & R)(800-900usd) ...based on same concept)But I focus on real effective can archive.
I found ground is nothing need if drives are battery operating mode.
Set dap vol =0 and amp vol =max(to gain any noise of transmition to max level) to confirm is best way.
Also touch to metal body during test (to gain more noise cause by groundless problem)
Btw all the users of masskobo 404/424 use grounding connection. It is being stressed upon by the Mass kobo's designer/engineer Masuda San.