Vintage Koss pro 4aa specs.....

Discussion in 'Headphones' started by jameselmer66, Sep 14, 2018 at 8:09 AM.

  1. jameselmer66

    jameselmer66 Active Member

    Messages:
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    the hills of KY
    I've looked everywhere that I know for the spec sheet for '70's built Koss pro 4aa headphones. If anyone might have that info or could point me in the direction to find it. I would appreciate very much. I've acquired a pair and like the sound so far. Pretty darn heavy and clunky but not too uncomfortable. I have found that these cans do not like mediocre or bad mastered CD's or vinyl. I listened to a Phil Collins CD which the mastering was of so-so quality. And they sounded terrible. But I played Dave Mathews Band, Crash CD and Wow! Very nice indeed. Nice tight bass and smooth mids to nice highs. I am pleased. But I would really like to have the specs. Thanks
     

     

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  2. nitrous

    nitrous 96 dB freak!

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    This info is from the insert which came with my set of Koss Pro-4AA headphones purchased in the spring of 1973 for $31.88 from Lafayette Radio (list price $60):
    Frequency response: 10-20,000 Hz (no +/- info listed).
     
  3. jameselmer66

    jameselmer66 Active Member

    Messages:
    327
    Location:
    the hills of KY
    Thank you
     
  4. tom3

    tom3 Super Member

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  5. jameselmer66

    jameselmer66 Active Member

    Messages:
    327
    Location:
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    Yeah, I appreciate the effort but those specs are for the modern Pro 4aa. They don't hold a candle to the vintage. If I remember correctly the vintage 4aa impedance is 32 but the modern 4aa are a whopping 250. So if you don't have a headphone amp or a decent home amp you can't get sound your looking for out of them. And from what I understand the drivers are way different. I think I've pieced enough 8nfo to cover the specs I'm looking for. Again thanks for the help.
     
  6. ra.ra

    ra.ra Super Member

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    Specs attached for original Pro-4AA headphones, circa 1975.
    Koss Pro-4AA specs.jpg
     

     

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  7. jameselmer66

    jameselmer66 Active Member

    Messages:
    327
    Location:
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    Thank you
     

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