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