Audio Aero Pirma DAC versus MF TriVista 21 DAC

Since you're asking generally, here's my *opinion*: the AA.
Heard both (& a few others) play orchestral music in a Burmester system, A-Physics spkrs.
Is there s/thing you don't like about the AA Prima (I note that you have one)? Cheers!

Try a (cheap) single-core copper speaker cable.

Re: wire. I would suggest 1-1,2mm magnet wire (pure copper, enameled). A good, fresh, beer helps, too:) Cheers!

Just go to any electronics supplies or electronics repair shop and ask for magnet wire (the wire used in winding magnets, voice-coils for speaker drive units, etc). They'll give you the wire for a few Euro. All you need are about 12-15 m to make a 3-3,5m pair of spkr cable.

Cheers (trappiste beer is the healthy stuff)