I would think the 300 into 4 ohms would be fine unless you’re a volume freak.
Magnapan 35r and Hegel C55 Amp
Just purchased a set Magnapan 3.5r and Have a Hegel C55 Amp. The amp does 150 / 300 / 600 into 8 / 4 / 2 Ohn and I plan to biamp. Do you think that would be OK? I know that more power would be better but this is what I have now.