Koss Pro4AA Stereophone with 10-25,000 Hz Frequency Response

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About Koss Pro4AA

Koss Pro4AA portable stereophone is full-size professional quality stereophone and has long been the headphone of choice for broadcast and recording professionals whose careers demand reliable equipment and superior performance. As the first dynamic stereophone to deliver true full frequency, high-fidelity performance, the PRO4AA set the standard when it was introduced in its original form in 1970.

In the late 1980s after long service, it was retired and replaced by a newer model. Customers clamored for its return and by 1988 it was brought back by popular demand. Since then, though performance-enhancing technology has been incorporated and updated, the essence of the PRO4AA remains unchanged and it continues to set the standard for performance and reliability today.

The PRO4AA features dynamic elements for an exceptionally wide frequency response from 10-25,000 Hz. Designed for frequent use over extended periods, the PRO4AA's durable steel and rubber headband is generously padded. Adjustable slide bars ensure a snug fit, also critical for hearing every note and keeping unwanted sounds out. The heavy-duty, single-entry ten-foot coiled cord affords ample flexibility of movement. It includes microphone mount hardware for complete versatility.

The PRO4AA has a 6.3mm (1/4") plug and an 8 foot coiled cord.Whether you are a sound professional or simply love music, the PRO4AA will deliver excellent isolation, accurate sound reproduction and the excitement of a live performance to your recording.

Koss Pro4AA Specifications

Frequency Response
10-25,000 Hz
250 ohms
95dB SPL/1mW
Coiled, Single Entry, 10ft
Koss lifetime warranty

Koss Pro4AA Reviews

Reviewed by 2 customers

(0 of 1 customers found this review helpful)


Great sound, likes older amps


from Meridian Mississippi  -  Experienced

If the ear cusions were twice as thick to keep the screens in front of the drivers off of your ears, they would be perfect. These things are like a vise anyway, and if they were to only rest on the cushions, just resting on your head, and not your ear too, would be awesome. Two hours watching a movie was torture, very uncomfortable. Like I said, redesign the cushions and you got a world beater, especially when used with a Schiite Valhalla 2 headphone tube amp. I got a set of these for fathers day, they did not like my HK3490Z unless I turned up the volume, a lot. Burned them in for a week, got a lot better, but still needs more volume than these old ears can handle for more than a 20 or thirty minutes. Got out an old Realistic STA46 receiver and they sounded a lot warmer, much more base, but not as good on the highs. Borrowed the headphone amp and, wow. I am sending them back to Koss and getting the ProAAAT. I hope they are more comfortable, and from what I have read, have the added base, without having to max out the tone control. They just need a better ear cusion for comfort. If you have a smaller head, that would be a big plus used as is as far as the comfort issue. Bring back the HV1A with a modern cushion and Koss could not make enough of them. Thanks! Charlie

(1 of 1 customers found this review helpful)


Superb product


from Neodesha Kansas  -  Experienced

Can't believe these phones are still around. Listened to them in the early 70's on old records and they sound great. Look at the frequency response. That ought to tell you something. Extremely low distortion and the earpieces keep all the nasty sounds out!!!. You know like the neighbor and the kids etc. Personally I listen too Pipe Dreams religously and these are the best way to hear it. You can double or triple the cost and still not equal the sound.

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