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Thread: C50 Olympus

  1. #1
    Junior Member ET60's Avatar
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    C50 Olympus

    Hello
    I believe this is a S8 system. Please correct me if I'm wrong. Trying to upload photos I hope it works. I will have to do it in two posts
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    Junior Member ET60's Avatar
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    C50 Olympus

    Quote Originally Posted by ET60 View Post
    Hello
    I believe this is a S8 system. Please correct me if I'm wrong. Trying to upload photos I hope it works. I will have to do it in two posts
    Thank you[Name:  IMG_20210916_165214JBL1.jpg
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  3. #3
    Administrator Mr. Widget's Avatar
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    It is probably an S8. Grab a photo of the mid driver to confirm or pull off the lens and see if you have a 1” or 2” driver.

    Assuming that you have the 2” 375 drivers in there, then yes they are S8s and if in good condition are keepers. You will need to refoam the woofers if you want them to sound right. The old Lans-a-loy gets stiff over time and will drastically reduce the low frequency output.

    Hopefully the mid and high frequency compression drivers haven’t been abused.



    Widget

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    Administrator Mr. Widget's Avatar
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    I just looked more carefully, they are not a pair of speakers, but rather two singles. One looks to be an S7 with the energizer (JBL’s integral amplifier) and the other is the one that is likely the S8.


    Widget

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    Junior Member ET60's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    It is probably an S8. Grab a photo of the mid driver to confirm or pull off the lens and see if you have a 1” or 2” driver.

    Assuming that you have the 2” 375 drivers in there, then yes they are S8s and if in good condition are keepers. You will need to refoam the woofers if you want them to sound right. The old Lans-a-loy gets stiff over time and will drastically reduce the low frequency output.

    Hopefully the mid and high frequency compression drivers haven’t been abused.



    Widget
    2"

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    Junior Member ET60's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    I just looked more carefully, they are not a pair of speakers, but rather two singles. One looks to be an S7 with the energizer (JBL’s integral amplifier) and the other is the one that is likely the S8.


    Widget
    My Dad always used them the way they are since 61 or 62. I'm too ignorant to know how to change them. I don't even know how to hook them up

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    Junior Member ET60's Avatar
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    Quote Originally Posted by ET60 View Post
    My Dad always used them the way they are since 61 or 62. I'm too ignorant to know how to change them. I don't even know how to hook them up
    The way I understand it is that the Transducer works both through a component cable. Is that not so?

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    Junior Member ET60's Avatar
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    Quote Originally Posted by ET60 View Post
    2"
    He quit using them when he discovered YouTube. He was an old man and each day I understand more about that.

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by ET60 View Post
    The way I understand it is that the Transducer works both through a component cable. Is that not so?
    I’ve never seen one before. If you can take a sharp picture of the unit I bet we can figure it out.

    I assume the C50 with the Energizer has a 1” LE85 instead of the 2” 375 driver.


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    Junior Member ET60's Avatar
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    Mr. Widget
    It is a 2" driver, I put a 2" supplement bottle in it. I did that while cleaning them to verify it was a 375.

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    Junior Member ET60's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    I’ve never seen one before. If you can take a sharp picture of the unit I bet we can figure it out.

    I assume the C50 with the Energizer has a 1” LE85 instead of the 2” 375 driver.


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  12. #12
    Administrator Mr. Widget's Avatar
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    Never saw one or played around with one, but looking this over it seems pretty self explanatory. It is simply a stereo amp stuck on the back pf one of your speakers. The unbalanced RCA line level output from your preamp (or other line level source with a volume control) feeds the two RCA inputs of the Energizer. There are then a pair of speaker outputs that go to the two speakers.

    Understanding this, only having one makes sense. That said, the question I have for you is if these were a matched pair, why is there no 075 tweeter (the silver bullet shaped unit) in one of the two systems?

    There were two popular systems installed in the C50 cabinets. The S7 which had an LE15A woofer and an LE85 mid/tweeter, and the S8 system which had an LE15A woofer, a 375 mid, and a 075 tweeter. An S8 without the tweeter would have very rolled off highs. One S7 and one S8 would be an odd pairing.


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    Junior Member ET60's Avatar
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    Quote Originally Posted by Mr. Widget View Post
    Never saw one or played around with one, but looking this over it seems pretty self explanatory. It is simply a stereo amp stuck on the back pf one of your speakers. The unbalanced RCA line level output from your preamp (or other line level source with a volume control) feeds the two RCA inputs of the Energizer. There are then a pair of speaker outputs that go to the two speakers.

    Understanding this, only having one makes sense. That said, the question I have for you is if these were a matched pair, why is there no 075 tweeter (the silver bullet shaped unit) in one of the two systems?

    There were two popular systems installed in the C50 cabinets. The S7 which had an LE15A woofer and an LE85 mid/tweeter, and the S8 system which had an LE15A woofer, a 375 mid, and a 075 tweeter. An S8 without the tweeter would have very rolled off highs. One S7 and one S8 would be an odd pairing.


    Widget
    That's a good question and I have no idea unless it can be shared the same way as the transducer.Name:  IMG_20210927_134935.jpg
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    Lightbulb S8 evolution

    [QUOTE=Mr. Widget; Never saw one or played around with one, but looking this over it seems pretty self explanatory. It is simply a stereo amp stuck on the back pf one of your speakers. The unbalanced RCA line level output from your preamp (or other line level source with a volume control) feeds the two RCA inputs of the Energizer. There are then a pair of speaker outputs that go to the two speakers.

    Understanding this, only having one makes sense. That said, the question I have for you is if these were a matched pair, why is there no 075 tweeter (the silver bullet shaped unit) in one of the two systems?

    There were two popular systems installed in the C50 cabinets. The S7 which had an LE15A woofer and an LE85 mid/tweeter, and the S8 system which had an LE15A woofer, a 375 mid, and a 075 tweeter. An S8 without the tweeter would have very rolled off highs. One S7 and one S8 would be an odd pairing.

    Widget[/QUOTE

    Giving away my age here: My old 1964 catalog shows S8 as a two-way . . . as bad as that sounded. Later, at some point, it was apparently revised to 3-way with 075 (my 70s catalog shows the 075 std). So, suspect that is what happened here. Two separate purchases, the later with 075 upgrade. The plot thickens.

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    Junior Member ET60's Avatar
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    My Dad bought them while stationed on Wake Island. Makes me think he got them in Japan. We were there in 1962. He had a Marantz model 7 and a letter, that I still have, from Marantz stating it would be cost prohibitive to exchange the model 7 for a model 9. Instead they would mail him the instructions and parts for the conversion. I don't know how to tell if that took place. He was an Electrical Engineer and a good solderer so he had the ability. I'm telling you all this because it may contain clues to someone on the forum.

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