hifi engine

Manual Library / Koss

Koss Pro-4

Professional Stereo Headphones (1975-77)

add a review (2 reviews)

Koss Pro-4


The PRO/4 Triple A makes your listening easy. This all new professional model stereophone from Koss will give you hours of fine listening pleasure in the same tradition as the Koss PRO/4AA, the world's largest selling high fidelity stereophone.

The extra wide, super smooth frequency response of 10Hz to 22,000Hz offers a full bandwidth dynamic Sound of Koss which gives you the solid, deep bass and clear, transparent highs that you expect to hear in your favourite music.

Professional Koss designers utilized the techniques of human engineering to develop the unique Koss Direct Contour Pneumalite ear-cushions and the exclusive Koss Pneumalite suspension dual headband that let you float hour upon hour, unconfined through your private realm of listening pleasure.

The earcushions make a perfect seal against outside noises and extend linear bass response to below audibility.


Frequency Response: 10Hz to 22kHz

Cord Length: 300cm

Weight: 440g

Year: 1977



 Login or register to post reviews

Reviewed Mar 22nd, 2019 by Jromero

Koss Pro-4AAA one of the best headphones ever produced! Superb for listening Classical Music

Reviewed Oct 23rd, 2018 by Jkritikos1

Great headphone for voice. Very clear. Compared to mh50 x the AT sounds muffled in mid. aT is also Boomy. Won’t sell mine.



This website is not affiliated with or sponsored by Koss. To purchase Pro-4 spares or accessories, please contact the company via their website or visit an authorised retailer.