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Vintage Koss Pro 4AA and Pro 4AAA frequency response tests

post #1 of 2
Thread Starter 

Hi! This is my Koss from early 70-s!

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KOSS (4).JPG

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I tried to draw the frequency-response of my vintage Koss Pro 4AA and Pro 4AAA by ear because I did not find their professional frequency-response tests!

Is there any professional tests of Koss Pro 4AA and Pro 4AAA sound, comparing with modern Koss models?
 

 

АПЧХ.jpg

post #2 of 2

DKossZoSo I have a question

 

What are the differences in sound between the Koss Pro 4 AA and the Pro 4AAAs? [the originals,not the titaniums]

 

I noticed Neil Diamond wearing them on one of the gatefold photos inside his masterpiece album The Jazz Singer.

 

The driver design looks similar to the Pro 4AAAT's . If they sound anything like Koss's precariously constructed open air Pro 4 AAAs from the 1980's I'll pass,lol. These phones would fall apart with a sneeze.

 

The Pro 4AAs are the best headphone I've ever owned,I think most discruntled owners are using them on I Pads or digital. For analog,thier sound can't be matched. The only problem I have with them is if you get a short in the wiring it's a very arduous job resoldering. Another bummer is the rubber headband has a nasty habit of turning gummy with age as with the inner foam pads that deteriorate with time and can actually get inside the driver housing:confused_face:

 

http://cleaningvinyllps.blogspot.com/

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