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Vintage 1970's Koss PRO4AAA Over Ear Headphones Tested Good sound Early Model

pakstack

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US $69.00

ApproximatelyC $94.45

Condition:

Used

People want this. 10 people are watching this.

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Located in: Tucson, Arizona, United States

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Estimated between Sat, Jul 5 and Fri, Jul 11 to 94104

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No returns accepted.

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eBay item number:156775583753

Last updated on Jun 06, 2025 19:46:06 EDTView all revisionsView all revisions

Item specifics

Condition: Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is ...

Form Factor: Headband

Number of Earpieces: Double

Wireless Technology: NA

Custom Bundle: No

Model: Koss Pro/4AA

Connectivity: 6.35 mm (1/4 in)

Year Manufactured: 1970s

Microphone Type: None

Country/Region of Manufacture: USA

Suitable For: DJ, Live Monitoring, Studio Monitoring

About this product

Product Information

Experience professional quality stereophonic sound with the Koss PRO-4AA designed for broadcast and recording. The durable steel head band of these Koss stereophonic headphones is well padded for comfortable long time use. Offering you exceptional wide frequency range of 10 - 25,000 Hz, these over-the-head headphones deliver outstanding sound quality. The heavy-duty ten-foot coiled cord of the Koss PRO-4AA allows for easy flexibility of movement while recording or listening. These Koss stereophonic headphones include mic mount hardware for a complete versatility in usage. Enjoy high-fidelity performance and maximum bass and isolation by wearing these over-the-head headphones.

Product Identifiers

Brand

Koss

MPN

PRO/4AA

Model

PRO4AA

eBay Product ID (ePID)

114539003

Product Key Features

Color

Beige

Features

Adjustable Headband, Noise Isolation

Type

Ear-Cup (Over the Ear)

Additional Product Features

Brand Color

Beige

Suited for

Consumer Headphones

Connector(s)

6.3mm (1/4in), 3.5mm (1/8in)

Impedance

250ohm

Maximum Frequency

Number of Earpieces

Ear-Cup (Over the Ear), Headband

Sensitivity

95dB

Minimum Frequency

Item description from the seller

About this seller

Joined Jul 2009

Usually responds within 24 hours

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Detailed seller ratings

Average for the last 12 months

Accurate description

5.0

Reasonable shipping cost

5.0

Shipping speed

5.0

Communication

5.0

Seller feedback (225)

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Great seller. Package got lost for a minute in the mail. The seller contacted me to let me know what was going on. Package finally arrived and everything looks good.
Redfield 3x9 Accu-Range Rifle Scope 1976 like M40 W/ Box & Rings | No Reserve (#156557792081)
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shipped quickly, packed very well, Item better than described. Good value. Happy customer.
KOSS PRO-4 Professional Headphones Green 1960's (#156940582639)
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The military item was just as described. It was well packaged and quickly shipped. Doing business with this seller was easy and I would use them again.
M1 Helmet Liner 1950's Capac? (#156852207362)

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Product ratings and reviews

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4.5

63 product ratings

51 users rated this 5 out of 5 stars
3 users rated this 4 out of 5 stars
4 users rated this 3 out of 5 stars
1 users rated this 2 out of 5 stars
4 users rated this 1 out of 5 stars

Good sound quality

Comfortable

Lightweight

Most relevant reviews

See all 50 reviews

by jruf8197
Oct 24, 2017Top favourable review
Old school enclosed headphone
If you are into an old school fully enclosed headphone it's difficult to beat this pair. This is a sturdy time tested design has been around since the 1970s. It produces a smooth and accurate sound while eliminating a great deal of outside noise distractions. These do not feel like a modern light headphone they are a bit heavier due to the solid construction and oldschool design. This aspect is a big part of their charm. The 250 ohm rating does require you to turn the output up quite a bit more than you would on other headphones. This aspect does not detract from the good sound quality it just means you need to use more energy to drive the headphone. Play back at low volume may seem a bit lacking, however at mid and high volume you receive a rich full sound. Sturdy construction with a ... If you are into an old school fully enclosed headphone it's difficult to beat this pair. This is a sturdy time tested design has been around since the 1970s. It produces a smooth and accurate sound while eliminating a great deal of outside noise distractions. These do not feel like a modern light headphone they are a bit heavier due to the solid construction and oldschool design. This aspect is a big part of their charm. The 250 ohm rating does require you to turn the output up quite a bit more than you would on other headphones. This aspect does not detract from the good sound quality it just means you need to use more energy to drive the headphone. Play back at low volume may seem a bit lacking, however at mid and high volume you receive a rich full sound. Sturdy construction with a good quality sound production and a lifetime warranty, it's hard to beat this pair of headphones.
Verified purchase: YesCondition: NewSold by: boxybay_deals
by sdecker3bcm
Apr 27, 2016Top critical review
Times have changed
These were my first 'real' headphones from 1974-1979. Even with moderately-priced Japanese electronics of the era, they sounded amazing in my late-teen years. I sold them in 1979 for AKG K240 Sextetts. I haven't heard them since then until I decided to hear my old reference in early 2016. I have every reason to believe the Pro4AA I bought from eBay are in good shape sonically and all-around, and built sometime in the '70s. They have the vice grip clamp on my head and ears and are very heavy by today's standards, which I expected. I didn't expect the sound was so, uh, colored, nor do I remember it being so much so. A huge upper-bass emphasis ~300Hz, still-strong bass below there, that render mids and treble way into the background. And this is using equipment that is far more ... These were my first 'real' headphones from 1974-1979. Even with moderately-priced Japanese electronics of the era, they sounded amazing in my late-teen years. I sold them in 1979 for AKG K240 Sextetts. I haven't heard them since then until I decided to hear my old reference in early 2016. I have every reason to believe the Pro4AA I bought from eBay are in good shape sonically and all-around, and built sometime in the '70s. They have the vice grip clamp on my head and ears and are very heavy by today's standards, which I expected. I didn't expect the sound was so, uh, colored, nor do I remember it being so much so. A huge upper-bass emphasis ~300Hz, still-strong bass below there, that render mids and treble way into the background. And this is using equipment that is far more open and capable than my '70s electronics. Eventually I plugged them into a good receiver with tone controls: it actually requires only minor adjustment to cut bass and boost treble to get a more-even tonal balance. Though that's imperfect vs proper equalization, it does show the high frequencies and vocals are actually fairly well-rendered even compared to modern $100 MSRP closed-back headphones. And it remains a remarkably well-built robust piece throughout, as their materials, condition, adjustability and even sound prove out. Compared to modern reference-level headphones there's no comparison sonically. But in 45 years you'd expect headphone technology to move forward substantially, especially with the relatively recent mainstream popularity of headphones. But for $25 they're well worth keeping as a not-awful-sounding piece of high-end history. Comparing them to brand-new current-production $100 Koss Pro4AA from the factory, er, well, that's a different review...
Verified purchase: YesCondition: Pre-OwnedSold by: trotter1wo
by gtodc542015
Feb 10, 2017
The GREATEST studio headphone ever created!
There is not a lot that needs to be said. How do you describe the best stereo headphone ever manufactured. I could write for a solid hour about the frequency response, sound quality, low distortion rating, etc, etc. But instead of boring you with technical jargon, all I will say is buy 'em, try 'em and you will be in stereo ecstasy! Whether you dig classical, rap, country, metal, classic rock, jazz, whatever you listen to, these are the greatest sounding headphones ever made! They have been the standard of MANY recording studio engineers for decades! Buy a pair and you will QUICKLY see why! There is not a lot that needs to be said. How do you describe the best stereo headphone ever manufactured. I could write for a solid hour about the frequency response, sound quality, low distortion rating, etc, etc. But instead of boring you with technical jargon, all I will say is buy 'em, try 'em and you will be in stereo ecstasy! Whether you dig classical, rap, country, metal, classic rock, jazz, whatever you listen to, these are the greatest sounding headphones ever made! They have been the standard of MANY recording studio engineers for decades! Buy a pair and you will QUICKLY see why!
Verified purchase: YesCondition: Pre-OwnedSold by: crazydealsllc
by fenderman375
Jan 16, 2019
good isolation, great sound
I needed a good set of isolation headphones to use when I'm practicing on my drum set to cds. Works great. Great sound and isolation. I have used Koss phones in the past, never disappointed in the quality or the sound!
Verified purchase: YesCondition: NewSold by: *alcam0*
by kpatstone-2012
Sep 05, 2018
Thanks for making these headphones again !!
I bought these headphones to replace a pair that I sold to a friend years ago. Koss is a very good brand and the sound quality is just great.
Verified purchase: YesCondition: NewSold by: mygoods

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Vintage 1970's Koss PRO4AAA Over Ear Headphones Tested Good sound Early Model

Shop with confidence

Item specifics

About this product

Product Information

Product Identifiers

Product Key Features

Additional Product Features

Item description from the seller

pakstack

99.2% positive feedback•576 items sold

Detailed seller ratings

Seller feedback (225)

Product ratings and reviews

Most relevant reviews

Old school enclosed headphone

Times have changed

The GREATEST studio headphone ever created!

good isolation, great sound

Thanks for making these headphones again !!

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pakstack

99.2% positive feedback•576 items sold

Detailed seller ratings

Seller feedback (225)