I hooked up Comet with a 4.4mm balanced cable to Sony ZX300 (about 150 hours of burn-in. Yes, Sony recommends burn-in with normal volume and normal tracks). Zx300 was set to high-gain. Outstanding sound presentation with Comet. Very good width and separation. Positioning and imaging is stunning. Very good pair up. May be when I get some time later, I'll pair it up with Sony WM1A & iBasso DX200 (with AMP4S & AMP4) with the same 4.4mm balanced cable.