Be sure to keep separate the ideas of bias and the drive requirements at the Gate. You can have low bias with high drive at the Gate, high bias with low drive at the Gate, low and low, high and high...
Given that headphones require relatively modest voltage swing, charging and discharging the Gate capacitance is comparatively easy. In the case of my headphone amp, the MOSFETs are biased at .5A (something like 25V rails, I think) which is clearly pretty healthy bias for a TO-220 case. Needless to say, they're mounted on decent-sized heatsinks.
Grey
Given that headphones require relatively modest voltage swing, charging and discharging the Gate capacitance is comparatively easy. In the case of my headphone amp, the MOSFETs are biased at .5A (something like 25V rails, I think) which is clearly pretty healthy bias for a TO-220 case. Needless to say, they're mounted on decent-sized heatsinks.
Grey
This mini-Aleph-J i'm asking questions for will have about 500mA bias, with +/-15V rails, so i guess you're the guy to talk to, GRollins 😀 
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