thanks for quick respond! that's sad... I was just watching Zeos review on this amp, and he didn't left a good review either... rca sources bleed to each other etc. Its just that there's a sale offer in Greece these days, and I can find it for 350euros , and A-S501 for 400. I don't even have speakers but i want something future - proof as im building my audio equipment. Already bought a technics used cd player, seems to be working fine with my ohelbach dac. Im thinking of my options to power my headphone with good quality until i complete my set up...