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Headphone selection & Impedance

Posted by chillysalsa on September 26, 2002 at 09:01:06:
Ok, this is a simple one:
When selecting heaphones to work with the jack on your amp, what is the 'minimum' impedance you can run based on the specs? How do you calculate it?
E.g.: Specs for headphone jack are:
Rated output - 0.3V @ 8 ohms
Impedance - 680 ohms
ohm my gosh I can't figure it out...