I have a REF 75 and there's nothing in the manual warning about using the amp with non-ARC preamps.
I don't drive it with a ARC preamp.
The REF 75 only has balanced inputs, so you do need a preamp with real balanced outputs.
I don't drive it with a ARC preamp.
The REF 75 only has balanced inputs, so you do need a preamp with real balanced outputs.