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. Marketed as "the pinnacle of audio reproduction," it was positioned as a high-end audiophile product designed to set the standard for electrostatic headphones. The system includes the ESP/950 headphones and a dedicated amplifier unit, with the complete package built in the USA. It features a straight, dual-entry cord design 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 is an electrostatic headphone system featuring a straight, dual-entry cable and a construction that emphasizes precision audio delivery. The entire system was made in the USA, reflecting Koss’s domestic manufacturing commitment at the time.
Context
Debuted in 1990, the Koss ESP-950 was presented as a flagship audiophile system, claiming to set the standard for electrostatic headphone performance. It was priced at $999.99 and received recognition for its enduring engineering, with commentary noting its competitive standing even decades after release.
Market
Originally sold for $999.99, the ESP-950 has appeared in the used market at lower prices, with one buyer reporting a $600 purchase during a Black Friday sale. Being made in the USA may contribute to its collectibility, though no specific data on common failures or repair needs is available.
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