SS, since the 650s have a 300 ohm impedance, it's questionable(don't know the 601's headphone output)whether they would be driven to a satisfactory volume(but careful about your hearing). Again, the 595s, with a 50 ohm impedance, might be a better choice.
As an edit, my understanding is that generally the receivers have no separate headphone amp, but rather they simply insert a resistor or some voltage dividing circuit to reduce the output of the amps to the milliwatt range suitable for headphones.
Last edited by JohnK; 05/26/06 03:57 AM.
