Koss ESP-950 (1990)

An electrostatic headphone system introduced in 1990, built in the USA and marketed as the pinnacle of audio reproduction.

Overview

The Koss ESP-950 is an electrostatic headphone system introduced in 1990. Koss marketed it as "the pinnacle of audio reproduction" and positioned it as a high-end audiophile product, meant to set the standard for electrostatic headphones. The system has two parts: the ESP/950 headphones and a dedicated amplifier unit. The whole package was built in the USA. It uses a straight, dual-entry cord and weighs just over 12 ounces.

Specifications

Product type	Electrostatic headphone system
Frequency range	8Hz–35,000Hz
Weight	Over 12 ounces
Original price	$999.99
Production start	1990
Cord length	4-foot attached cord with 5-foot, 9-inch extension included
Amplifier input impedance	50,000 ohms

Design

The ESP-950 uses a straight, dual-entry cable, and its construction is aimed at precise audio delivery. The entire system was made in the USA, which reflects Koss's domestic manufacturing at the time.

Context

The Koss ESP-950 debuted in 1990 as a flagship audiophile system, with Koss claiming it set the standard for electrostatic headphone performance. It was priced at $999.99. It has been recognized for its engineering, and commentary notes it still competes decades after release.

Market

The ESP-950 originally sold for $999.99. It has turned up on the used market at lower prices, and one buyer reported paying $600 during a Black Friday sale. Being made in the USA may add to its collectibility. No specific data on common failures or repair needs is available.

eBay Listings

Koss ESP-950 vintage audio equipment - eBay listing photo 1

Koss ESP-950 Electrostatic Headphones with Amplifier Energiz

$400

See all Koss ESP-950 on eBay

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