[Elecraft] Low headphone audio level and a question to Wayne

[Robert Kirkland]

We know that to obtain the maximum audio level between two devices we must 
match the impedances between them. The impedance of mono and stereo headsets 
vary widely a good way to tell is if you have to rotate the volume control a 
lot to get a small increase in volume there is a mismatch.The questions are: 
What are the headphone output impedances of the front panel and the rear 
panel jacks and do they vary between modes?.
Bob,
w5pvr