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Nice working set of Koss ESP 9 headphones.
Tested, working.
Includes manual with the frequency plot, and a partial photocopy of the service manual.
Also includes the very hard to find correct power cord.
Ear pads are stiff, new ones are still available from Koss.
$150 plus shipping, US lower 48 only.
Nice working set of Koss ESP 9 headphones.
Tested, working.
Includes manual with the frequency plot, and a partial photocopy of the service manual.
Also includes the very hard to find correct power cord.
Ear pads are stiff, new ones are still available from Koss.
$150 plus shipping, US lower 48 only.
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I retested them yesterday and noticed a low level hum, but when I switched to another (low power) amp the hum was gone. Not sure this is/was a ground loop issue or aging filter caps in the Koss energizer.
Also, I suspect most of you know this, but these will not work connected to the typical 1/8" or 1/4" headphone jack on a receiver or amp. They need to be driven by a power amp.
A few more pictures:
Also, I suspect most of you know this, but these will not work connected to the typical 1/8" or 1/4" headphone jack on a receiver or amp. They need to be driven by a power amp.
A few more pictures:
