Re: Aircraft headset speaker impedance and ubitx #ubitx

Tom, wb6b
 

Hi,

Because the earphones are directly over your ears, would it be possible that you don't need as much power to drive them, and 600 ohms would provide sufficient power to possibility supply more volume than needed? Likely the audio output of the amplifier is not bothered by driving 600 ohms vs 8 ohms. 

Another question. Would the impedance of the earphones be higher for AC (the audio) than DC, as measured by an ohmmeter? That would be the case for a transformer and the earphones seem to be a transformer like device when the magnet is moving in the coil, when driven by audio. 

It is possible that earphones are not very efficient and the DC and AC impedance are nearly the same.

Tom, wb6b

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