The 818v3 is also a pre-amp, so all you need is a power amp and speakers.

There isn't a direct app that controls the inputs and volume. You can get something called virtualMSR for Meridian that does this but the hardware (Global Cache IP2SL device) is a little extra.

Sooloos, Roon, G series (with LPS upgrade), 800 series (with LPS upgrade), HD621, AC200, Prime and PS, DSPs old and new.

Purdeys, Moke, Leica, 'Blad. Only the best.