[Milsurplus] WWII-era USN headphone question

[WA5CAB at cs.com]

My understanding, although I can't finger any written references right now, 
is interphone system noise pickup (in crew-served vehicles as much as 
aircraft).

In a message dated 7/18/2005 8:16:38 AM Central Daylight Time, 
kk5f at earthlink.net writes: 
> I wonder what prompted the Signal Corps to make the transition from high-z
> to low-z in the middle of a war?  JAN compatibility?
> 

Robert Downs - Houston
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