Thanks very much, dpetr. Exactly the info I was interested in. Appreciate you taking the time. I didn't know that Mutec device you mentioned. ! Wow when I looked that up. I'm guessing that's in another league from Singxer or Eitr.
I use a Douk Mall split USB cable (separate leads for power and signal) with the power source being a little 5V Enercell AC/DC converter plugged into an APC H-10 power conditioner. Hopefully, there's enough space (width) when the Enercell is removed to plug in the Eitr wall wart.
Take care and thanks again.