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Old 31st August 2013, 05:00 PM   #1
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Join Date: Mar 2006
Location: New York
Question wiring replacement headphone jack for KH71

Bought Kenwood KH-71 stereo headphones with a broken plug. Wires were disconnected. It's a 4 conductor wire. Need help with diagram, instructions etc....
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Old 1st September 2013, 05:15 AM   #2
dangus is offline dangus  Canada
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Assuming they are normal dynamic headphones, it's trial and error. Find out which wires go to each side, then figure out which way they are in phase.
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Old 1st September 2013, 10:08 PM   #3
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thanks for reply. I have figured out the sides, what is the vest way to check the phase????
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Old 3rd September 2013, 07:42 PM   #4
dangus is offline dangus  Canada
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You should be able to tell if they are in or out of phase by ear. Play a mono signal, and if it's out of phase, it will sound like it's outside your head. As for absolute phase, that's trickier, and maybe not important. On loudspeakers it's usually safe to connect a small DC voltage (like a single 1.5V cell) and see which way the cone moves. With headphones, you'd need to be able to see the diaphragm (which often isn't possible without disassembling the headphones). So, maybe it's safer to just guess based on the colour of the wires, or open up the 'phones and see how the terminals are marked.

Or, use a microphone connected to a real or software oscilloscope, and play a repetitive positive-going test pulse signal through the headphones. Compare them with other headphones in case the phase is inverted somewhere in the playback and capture signal paths.

Last edited by dangus; 3rd September 2013 at 07:47 PM.
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