PRO4AAOver Ear Headphones

Koss Pro4AA headphones set the standard for full size professional headphones. They were introduced in 1970 as the first dynamic headphones to deliver true full frequency and high fidelity performance with impressive noise isolating capabilities.


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Retired in the late ’80s, Koss swiftly returned the Pro4AA headphones to its product lineup due to overwhelming popular demand. They have since remained a staple of studio headphones in the radio and recording industries. Koss Pro4AAs meet the stringent demands of broadcast and recording professionals who require reliable equipment and superior performance. The full size professional headphones keep unwanted sounds out while letting every note in. Whether you’re a sound professional or an audiophile, Pro4AAs deliver superior isolation, accurate reproduction and sound intensity, and the excitement of a live performance with every recording. Connecting with your music has never sounded so good.

Customer Reviews

Based on 9 reviews
Sharron Dalton
Over the top

I have used the PRO3 for well over 20 years, and finally needed a replacement. I upgraded to the PRO4 and they are just magnificent. The frequency response is, of course, better then most inputs, but on a really good system, these shine like the sun. I am absolutely thrilled with this upgrade. Should have done it 10 years earlier.

Michael Boone
Volume Control

A perfect match of my 1973 phones except that this pair has no volume control and that s---s.

Willard Arbour
Always My First Choice

I’ve been a radio broadcaster for 32 years. My first choice in headphones has always been the Koss Pro4AA’s.
Sure the stations always supplied headphones for their announcers but as soon as I got my first paycheck, these were the first thing on my shopping list. The sound is great and the excellent isolation insures that you can turn it up without the danger of feedback. So, turn it up! You won’t miss a detail with these “cans.”

Great way to start

Had the same pair of Pros since 1972. Same pair and same sound. Held up to all conditions I threw at them!

Dan Lette
Excellent Headphones

I purchased two pair of the Pro 4AA Headphones and I am completely satisfied. Before purchasing I did do some research and read many, many reviews and I was somewhat alarmed at the number of negative reviews that were out there. But having known the Koss brand for quite sometime and their excellent reputation I took the chance and purchased the two pair, and I am glad I did! The sound is crisp and clear and they are very well made. One of the biggest negatives I read is that the Headphones are TOO HEAVY’…. While they are heavier than most, they are not uncomfortably heavy, in fact they feel solid and secure!! To anyone thinking about these Headphones, do not be swayed by the negative reviews!! These are EXCELLENT Headphones!!

The History of Koss

The history of Koss spans over 60 years of ingenuity, integrity & innovation. #TheOriginal