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SOLD: KOSS ESP950 Electrostatic Headphone with 9v power supply upgrade

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Item: KOSS ESP950 Electrostatic Headphone and new power supply

Location: NSW

Price: $650+shipping

Item Condition: cosmetically and electronically mint.

Reason for selling: To fund a new setup
Payment Method: Pickup - Cash, Paypal, bank transfer
Extra Info: Key Features:

  • Electrostatic transducers deliver clean bass and unmatched sound quality
  • Pivoting ear cups and an adjustable/detachable headband ensure ultimate comfort and convenience
  • Straight, dual-entry 4 foot cord with 6 foot extension
  • Includes energizer, battery pack, leather carrying case, connecting cables and 120 VAC adapter
  • Covered under the Koss Stereophones Limited Lifetime Warranty


I got this gift several month ago, and probably got at most ~50-100 hours on it, so it is in like-new condition. From what I read from internet (see above), KOSS provides a lifetime warranty on ESP-950. It comes with the original 100v power supply (never used in Australia), which has been considered as a bottle-neck for the performance. So I ordered a customised power supply (240v input) with a much better toroidal transfermer, which delivers a much cleaner and more power to the amp. This upgrade in all the ways improve the sound. You will get everything including power supply, cables, manual, bags and original cas.





Edited by woodhead
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