Because the Opto dx's optical isolation is compromised the moment you plug in the receiver side into the mains...the only way it works 100% if if you use a battery.Yeah I might go the SRC-DX + Opto-DX + DC Blocks setup to use HQPlayer as well.
Why is DC blocks even needed if one is getting optical isolation with the OptoDX? Just wondering if there is a cheaper optical isolation solution for USB than the OptoDX ... streamline all the boxes.
Also would SRC-DX + Opto-DX + DC perform the same as Toslink and be identical if running 24/192?
Toslink would actually be better at 24/192 because you get full galvanic isolation, 0 noise. Even on battery the Opto-dx is dependent on the voltage regulator used.
Unfortunately, no matter how low noise Toslink is, the M-scaler is not immune to jitter, so BNC in actually sounded better from this perspective, but worse from the noise standpoint. So pick your poison.
And if you've moved on from the M-scaler, HQP + SRC-DX makes such a big difference than it more than compensates for the noise. Of course, there's no galvanic isolation, which is why the Intona helps. That's the least crazy improvement. The monoprice cable is 10m long and needs another usb a to usb cable and another really good 5v power supply. That + the rest of the stuff I have is already enough to make me buy a streamer/ or Phoenix USB and call it a day.