On Thu, 2005-10-06 at 09:30 -0700, bjackson wrote: > 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.
I'm pretty sure you have it backwards. A source produces voltage for the signal, and the driven impedance determines how much current is required. And the current times the impedance is the definition of power. A high impedance driver is easier to drive. It takes lots less power. One volt driving 16 ohms will draw 1/16th of an amp of current. The same one volt driving 300 ohms will draw 1/300th of an amp of current. The definition of power is R*I*I So one volt driving 16 ohms is 1/16th of a watt And one volt driving 300 ohms is 1/300 of a watt. It is low impedance speakers (and/or headphones) that are harder to drive. -- Pat http://www.pfarrell.com/music/slimserver/slimsoftware.html _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
