Koss ESP-6

 Koss model ESP-6 Electrostatic stereophones

Break through in design gives distortion free, wide-range frequency response. Never before possible in headphones.

 3 octaves of sound beyond the limits of ordinary coil and cone type driver elements - this wide range is reachable only through electrostatic.

World's first Self-Energized Electrostatics - easy to use you just plug-in like other headphones. No special amplifiers or power supplies needed.

Virtually Distortion-free, because of push-pull operation, Elements cancel all 2nd harmonic distortion, unlike ordinary units. Square waves can be reproduced for the first time by an electro-acoustic-reproducer.

Dynamic level Indicators give measure of level - flicer at 10th row full orchestral volume, stay lit at very high levels.

Calibrated Machine-Run Frequency response, Chart with each headset - positive guarantee that the headset you buy meets specifications.

Cleaner, Wider range response than the best loudspeaker system yet producer - for the first time you hear what really comes out of the tape machine, disc reproducer, radio-tuner or microphone.

 Through the development of the world's first self-energized and self-contained electrostatic headphones, a true breakthrough in wide-frequency response-range and low distortion has been achieved  by Koss physicists and scientists.   Reproduces 9 of 10 audible octaves. This wide range is reachable only through electrostatic stereophones. Exceeding performance of the best loudspeaker systems now available, you get a critical monitoring facility that tells you exactly what comes out of professional recording or monitoring equipment.  A new era in personal listening is now available to the discriminating  music-lover at 10% of the price of the finest loudspeakers, you get sound as originally recorded, without lost stereo from wall and ceiling reflections. Spurious room resonances are banished because of the controlled listening environment tailored exactly to the human ear.

Frequency response is 30 to 19,000 Hz (±5 dB). Model ESP-6 complete with 10' coiled cord and connector box T-3.

Koss T-3

Speaker - headphone transfer switch

The T-3 is designed to provide a means of switching from stereo speakers to Stereophones. It is connected to the speaker terminals of the amplifier or receiver. The T-3 should be used when the headphone jacks on the amplifier or receiver has high value resistors in series with it. These violently alter the normal 8 Ω impedance upward. The high impedance which results prevents high quality, low impedance headphones from delivering wide range performance.

The T-3 can be used with any amplifier having 4, 8 or 16 Ω output taps.