Koss PRO-4AAT Headphone Reviews

Manufacturer Koss Model PRO-4AAT
Headphone Type Closed Circumaural Headband Type Single
Weight (g) 595 Driver Type Dynamic
Enclosure Material Titanium Isolation (dB) 10
Impedance (ohms) 250 Cable Length (cm) 244
Frequency Response (Hz) 10 - 25000  
Connector 3.5mm with 6.5mm adaptor Street Price US$64
Buy from Amazon.com  
Average reviewer scores
Bass Extension 4.5 Bass Impact 4.0
Bass Quality 5.5 Mids Quality 5.0
Highs Quality 4.5 Soundstage 3.0
Detail 5.0 Portability 2.0
Isolation 7.0 Comfort 5.0
Durability 8.5 Improvement With Amplification 5.5
Value for Money 3.0    
Overall Score 5.4 Total Reviews 2

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Reviews by our members

Review by Senior Member lensman on 29 Jun 05  04:10
Individual review
Bass Extension5
Bass Impact4
Bass Quality4
Mids Quality4
Highs Quality4

i was really eager to get my hands on a pair of these..after owning a pair of koss porta pros i thought i was in for a superb pair of headphones....unfortunatly i couldnt be more wrong

even after a long burn in they dont really improve much,the worst part of these is the earcups..they form a hermatic seal round yours ears..which means when you take them off they create a vacuum, and it feels like your eardrums are being sucked out your head.. which is pretty damn painfull sometimes :D the seal they create is also broken every time you move your jaw..or turn your head...this might not apply to everyone...but i found it damn annoying....
as for the sound..nothing special...bass is pretty neutral...the mids and highs seem to be lacking any sparkle or punch and (worst in my book) there is no soundstage whatsoever...just sounds hitting your ears and the "inside" your head feeling of cheap phones....i really cant beleive these things cost me £89....the porta pros blow these out the water...on nearly every count (as do most other phones i own :( )..........all in all id avoid these phones

Review by Member Zombie250 on 07 Oct 08  13:47
Individual review
Bass Extension4
Bass Impact4
Bass Quality7
Mids Quality6
Highs Quality5

When I first bought these cans, I wasn't really all that impressed with them. They aren't bad, but you could get better cans for the same price (Grado SR-80's). Since these are "monitor" style headphones, they are designed to give a flat response across all frequencies. This makes the sound rather dull for my liking and there is no sense of realism. These headphones do sound good, it's just that they are rather flat sounding.

Since they are closed, the sound gets a bit of a "tin" sound, like an echo in a metal can. Closed cans adon't have the best sound and should be only used for mixing or editing music. They aren't really made for listening by traditional means.

Bass response is decent at best, but it isn't controlled all that well at times and also sounds really muffled. With Rock/Metal music, there isn't much of a problem. Just that anything that requires more bass, like Rap, doesn't really hold up and sounds underpowered. Most of the bass comes from the way the headphones isolate sound. If the isolation is good, the bass is good. If you are wearing glasses, the isolation will be bad and bass response will be reduced. remedy this, simply fold up a piece of paper towel and place it under the bonehead while in use. This creates more tension and causes the ear cups to be pushed closer together.

Treble response is there and is clear, albeit the headphones are flat. There is some decent clarity here, like when someone is taking a breath or symbols from a drum set are being struck. It's not the best I've heard, but definitely not the worst.

Mid-range is good for most types of music, but rock/metal have a tiny bit of a "grain" sound. You can only really hear it if you listen very carefully. Guitars sound good as well as vocals and drums.

These headphones sport a padded head band with liquid filled ear cups. The headband is quite comfortable and the ear cups are nice. One downside to the earcups is that they tend to get sticky as you sweat. Another bad thing is that since the headphones are closed, there is an immense amount of heat building up in your ears as there is no way for it to vent. If you wear glasses (like I do) your glasses will create tiny gaps that prevent the ear-cups from connecting to your head properly. This will lead to less bass response and discomfort (as stated above).

OK here is where they fail. There really isn't any soundstage, only left/middle/right sounds. This is really bad. All it sound like is if you have two speackers on each side of your head and all you can hear is left/right. Bah that's terrible!!

These cans are really huge! You really wouldn't want to bring these outside with you as they tend to draw a lot of attention. These are best suited for at home use. Other than that there aren't any issues with comfort with me.

These cans need a lot of power to properly drive. An Ipod or CD player just will not due. You need an amplifier of some sort to get the best sound out of them. They tend to lower my Ipod's battery life to 3-4 hours. Once amplified, they sound better and won't drain your batteries as much. Though is is the drawback, the amplification really only improve a bit, but you can still hear it.

Overall these can aren't that bad. Though they do have a few strikes against them but overall are pretty decent at best. If you are looking to buy some, go for Ebay as they sells for $50. That's where I got mine, whereas they sell for $100 on Koss' web-site. I'd only say buy these if you are looking for a decent pair of cans for mixing.