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PRO4AA Koss PRO4AA Full-Size Studio Headphones - Premium Sound

AztekWholesale

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US $102.48

ApproximatelyAU $156.96

Condition:

Brand New

Quantity:

15 available3 sold

Breathe easy. Returns accepted.

People are checking this out. 4 have added this to their Watchlist.

Postage:

Free UPS Ground.

Located in: US, United States

Delivery:

Estimated between Tue, 1 Jul and Sat, 5 Jul

Returns:

30-day returns. Buyer pays for return postage. If you use an eBay postage label, it will be deducted from your refund amount.

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eBay item number:256767195514

Last updated on 20 Jun, 2025 07:52:53 AESTView all revisionsView all revisions

Item specifics

Condition: Brand New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging ... Brand New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is available in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. See all condition definitionsopens in a new window or tab

UPC: 013039346407

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 Dec 2015

Aztek Computers is a leading provider of technology products and services. We help individuals, businesses, government and educational institutions worldwide in identifying, procuring and installing ...

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Detailed seller ratings

Average for the last 12 months

Accurate description

4.9

Reasonable postage costs

5.0

Postage speed

5.0

Communication

5.0

Other

Seller feedback (680)

This item (2)

All items (680)

e***6 (2528)- Feedback left by buyer.
Past 6 months
Verified purchase
Excellent seller!! Great price, fast shipping!! Would buy from them again!!
h***r (440)- Feedback left by buyer.
Past 6 months
Verified purchase
Excellent headphones. Arrived as described.

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Product ratings and reviews

Learn more

4.5

64 product ratings

52 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 51 reviews

by jruf8197
25 Oct, 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
28 Apr, 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
10 Feb, 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
16 Jan, 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
06 Sep, 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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PRO4AA Koss PRO4AA Full-Size Studio Headphones - Premium Sound

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Item specifics

About this product

Product Information

Product Identifiers

Product Key Features

Additional Product Features

Item description from the seller

AztekWholesale

100% positive Feedback•3.9K items sold

Detailed seller ratings

Popular categories from this Store

Seller feedback (680)

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 !!

More to explore:

AztekWholesale

100% positive Feedback•3.9K items sold

Detailed seller ratings

Popular categories from this Store

Seller feedback (680)

Picture 1 of 1

PRO4AA Koss PRO4AA Full-Size Studio Headphones - Premium Sound

Shop with confidence

Item specifics

About this product

Product Information

Product Identifiers

Product Key Features

Additional Product Features

Item description from the seller

AztekWholesale

100% positive Feedback•3.9K items sold

Detailed seller ratings

Popular categories from this Store

Seller feedback (680)

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 !!

More to explore:

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