ESP-9, energiser unit needed
Read more on the KOSS ESP-9 in our home audio section
Steve Tattum2004-02-26 04:15
I recently acquired a pair of Koss ESP-9 at a boot sale for £2 !! Excellent condition bit missing the energiser unit. Any info on connections and bias voltage gratefully received, otherwise these will be a very classy pair of ear defenders.
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Peter Brent2008-06-16 19:39
Hi Folks, I have owned and still use a pair of ESP9\'s.Several users of Headphone sites report missing/destroyed User manuals or Test reports. If you are amongst them ,get in touch and I will be happy to send copies if you cover the postage cost. Bought in 1973 I have been generally delighted with their output.They deliver a high end and crisp sound but due to their weight and brightness two or three hours use is about my maximum use, I did have a problem one night when somehow the cable across the headband leaked an awful amount of static or electrical current(?)resulting in my hair literally standing on end.To their credit Koss did sort this out . Anyone know the current value ? Regards.Peter Brent