hifi engine

Manual Library / Koss

Koss ESP-7

Electrostatic Stereophones (1969)

add a review add a review

Koss ESP-7


ESP-7 Electrostatic Stereophones are a new development employing the principle of a currentless, or electrostatic charge on push-pull condenser plates to cause movement of an intervening, light, conductive diaphragm.

The diaphragm will move in conformance to the signal energy from an amplifier to produce wide frequency response range with low distortion.

The ESP-7 provides a critical monitoring facility under a controlled environment with its very wide range frequency response capability, coupled with unusually low distortion products.

This facility includes 40 db isolation from extraneous noise (1 part noise to 10,000 parts signal). This exclusion of distracting sound is achieved through comfortable sealing with fluid filled cushions. These cushions conform to the irregularities of the head surrounding the ear. This seal functions even when the headphones are worn over glasses.

The variable of the speaker listening environment is bypassed. The standing waves in the room which cause violent peaks and valleys in the frequency response range are eliminated.

With the ESP-7 it becomes possible to tell what really comes out of your tape recorder, record player or FM tuner.


Type: electrostatic headphone

Frequency Response: 30Hz to 15kHz

Total harmonic disortion: 0.25%

Impedance: 8Ω

Accessories: SE-7 Self Energizer

Cord Length: 180cm

Weight: 17ozs

Year: 1969



This website is not affiliated with or sponsored by Koss. To purchase ESP-7 spares or accessories, please contact the company via their website or visit an authorised retailer.