I would be suprised if you got any decent output out of the SB2 into a HD600/650 load which are 300 ohms.
The standard headphone is 16-32-64 ohms, and the SB2 produces decent power into them, but I don't think it has the voltage needed to properly drive 600/650's, which are 10 x the impedance. If we assume a 3 volt RMS output to the headphones (which I think is pretty realistic at full output with music that is not always a constant 0db signal), this puts around 30mW into a 32 ohm load, but only 3mW into a 300 ohm load which really isn't that much, even for headphones. I wouldn't even consider it personally. If nothing else make a headphone amp or get one second hand. Just my two cents. -- bjackson _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
