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Vintage Koss pro 4aa specs.....

Discussion in 'Headphones' started by jameselmer66, Sep 14, 2018.

  1. jameselmer66

    jameselmer66 Active Member

    Messages:
    328
    Location:
    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!

    Messages:
    1,372
    Location:
    NYC
    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:
    328
    Location:
    the hills of KY
    Thank you
     
  4. tom3

    tom3 Super Member

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    1,932
    Location:
    So. Ohio
  5. jameselmer66

    jameselmer66 Active Member

    Messages:
    328
    Location:
    the hills of KY
    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

    Messages:
    1,727
    Location:
    metro Boston
    Specs attached for original Pro-4AA headphones, circa 1975.
    Koss Pro-4AA specs.jpg
     

     

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  7. jameselmer66

    jameselmer66 Active Member

    Messages:
    328
    Location:
    the hills of KY
    Thank you
     
  8. Boonaroo

    Boonaroo AK Subscriber Subscriber

    Messages:
    1,145
    Location:
    College Station, TX
    My very first pair of headphones. Wish I still had them. They were some great cans!!!
     
  9. mhardy6647

    mhardy6647 AK Subscriber Subscriber

    Messages:
    52,730
  10. Rey1

    Rey1 Well-Known Member

    I have a pair of the old ones, mine must be first generation or so because they have honking big speaker magnets jutting out from the sides. I mean almost like Frankenstein's neck bolts. Damn uncomfrortable but they do sound good on some recordings. I just need to do more neck work outs so they don't tip me over when I'm using them.
     
  11. red 111

    red 111 AK Subscriber Subscriber

    Messages:
    802
    Location:
    nyc
    had the originals also ...sound was good but uncomfortable to wear for extended periods...lent them to a acquaintance & never got them back...still looking for the dude!
     

     

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  12. twiiii

    twiiii Addicted Member

    Messages:
    6,218
    Location:
    west Texas
    I will admit I mixed a lot of live recordings using Pro 4 aa headphones. My last pair failed me about 5 years ago. Now I use Sennheiser 598, they are more comfortable and easy to listen too. They have better highs and bass even though they are open air headphones. They wouldn't be acceptable for live recording like the 4aa because they aren't sealed. In fact none of my 6 headphones are sealed anymore. Wonder how that happened? By looking for the best sound I guess. I will admit the 598's don't have the highs of my electrostatics or quite the clarity, but they are easy to live with and work well with my 10X iPhone. Yeah I had to spend $9.00 for the head phone adapter. Those ear plug things suck. Over the years I can't remember how many times I had to repair my 4 AA's. It was either the cross over cable, the fluid filled ear pads or the coiled cable. Only once or twice did I have to replace an ear speaker. Probably due to physical damage from transportation or dropping them on concrete floors. For the money they did a heck of a job. My portable Nakmichi 550 could blow you ears with 4AA's. My early favorites were my Model 9 electrostatics, but having to haul around my MC 240 to run them was a pain in the neck. But they sounded great with the old tube amp, something I couldn't say for a lot of early SS amps. My Crown D 150'As just didn't compare either.
     

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