[Elecraft] Yamaha CM-500 (was Heil Elite thread)

[David Woolley (E.L)]

Joe Subich, W4TV wrote:

> Modern audio outputs are generally act like current sources.

Voltage (i.e. low impedance) not current.

> The total power output based on the ability of the amplifier
> to provide current at the supply voltage.
> 
> The headphone amplifier in the K3 is an LM4811 specified for
> 105mW (continuous average power) into a 16 Ohm load and 70
> mW into a 32 Ohm load.  However, that does not tell the whole

I'd suggest that 70mW into an efficient headphone, tightly coupled to 
your ear is plenty loud enough to destroy your hearing.

Hearing aids can drive to the threshold of pain with only about 2mW of 
DC input, including the power for the DSP chip (1.8mA at 1.4 volts for 
power aids, 1.3mA, for normal aids).

-- 
David Woolley
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