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Thread: Newbie Here! 4312 Refurbish

  1. #1
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    Newbie Here! 4312 Refurbish

    Hello,

    I just got a free pair of 4312-A speakers. They have no woofers, Mid Range or a tweeters. If it is a toss away that is fine, but I was interested in fixing them if possible with upgraded parts. The crossovers are still intact. What says you?

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    Quote Originally Posted by TerrapinBill View Post
    Hello,

    I just got a free pair of 4312-A speakers. They have no woofers, Mid Range or a tweeters. If it is a toss away that is fine, but I was interested in fixing them if possible with upgraded parts. The crossovers are still intact. What says you?

    Don't toss them, you're more than half-way to having a nice set of vintage JBL's. If they were mine, I'd look for some 2213H woofers, 104H-3 mids and 035ti tweeters on ebay.

    BTW, I'm a newbie too so I understand the impulse to "upgrade" them. Keep in mind that JBL speakers are designed and built by professionals with the resources of research and development that go back to the 1940's, they knew what they were doing.

    I would encourage you to enjoy them as they were designed and built, including the original crossovers with original capacitors. If you find that you don't like the sound, pass them along to someone else.

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    Quote Originally Posted by bedrock602 View Post
    Don't toss them, you're more than half-way to having a nice set of vintage JBL's. If they were mine, I'd look for some 2213H woofers, 104H-3 mids and 035ti tweeters on ebay.

    BTW, I'm a newbie too so I understand the impulse to "upgrade" them. Keep in mind that JBL speakers are designed and built by professionals with the resources of research and development that go back to the 1940's, they knew what they were doing.

    I would encourage you to enjoy them as they were designed and built, including the original crossovers with original capacitors. If you find that you don't like the sound, pass them along to someone else.
    No I have every intention to keep them. Now what about the old insulation is there a need to replace? Everything internally looks good they just got poached for parts.

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    Quote Originally Posted by TerrapinBill View Post
    No I have every intention to keep them. Now what about the old insulation is there a need to replace? Everything internally looks good they just got poached for parts.
    Insulation doesn't go bad.

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    43XX (2235-2123-2450-2405-CC 3155)5235-4412-4406-4401-L250-18Ti-L40-S109 Aquarius lV-C38 (030) 305P MkII

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    Quote Originally Posted by Odd View Post
    thanks.

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    Quote Originally Posted by bedrock602 View Post
    Don't toss them, you're more than half-way to having a nice set of vintage JBL's. If they were mine, I'd look for some 2213H woofers, 104H-3 mids and 035ti tweeters on ebay.

    BTW, I'm a newbie too so I understand the impulse to "upgrade" them. Keep in mind that JBL speakers are designed and built by professionals with the resources of research and development that go back to the 1940's, they knew what they were doing.

    I would encourage you to enjoy them as they were designed and built, including the original crossovers with original capacitors. If you find that you don't like the sound, pass them along to someone else.
    can these parts be bought now or they will have to be scavenged around various places? My searches all
    popped up as second hand parts.

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    Quote Originally Posted by TerrapinBill View Post
    can these parts be bought now or they will have to be scavenged around various places? My searches all
    popped up as second hand parts.
    The woofers will have to be purchased second hand, JBL does not make them anymore. There are new after-market tweeters and mids available, I have not used them but I plan to try them out in a diy build.

    https://www.simplyspeakers.com/repla...nge-m-le5.html

    https://www.simplyspeakers.com/repla...-t-035tia.html

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    Quote Originally Posted by TerrapinBill View Post
    can these parts be bought now or they will have to be scavenged around various places? My searches all
    popped up as second hand parts.
    That's the reason the empty cabs popped up, the older systems get parted out so now you are ironically faced with finding somebody else who has parted a pair out to find drivers for your cabs.

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    Quote Originally Posted by TerrapinBill View Post
    Hello,

    I just got a free pair of 4312-A speakers. They have no woofers, Mid Range or a tweeters. If it is a toss away that is fine, but I was interested in fixing them if possible with upgraded parts. The crossovers are still intact. What says you?

    so that leads to me to my next question. Updating the old parts on crossovers. These are ancient I can imagine capacitors need to be changed out. Thoughts?

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    Quote Originally Posted by TerrapinBill View Post
    so that leads to me to my next question. Updating the old parts on crossovers. These are ancient I can imagine capacitors need to be changed out. Thoughts?
    I have quite a few vintage JBL and Altec speakers from the 1960's and 70's and have yet to find problems with any of the crossovers.

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    4312 Crossover

    Quote Originally Posted by TerrapinBill View Post
    so that leads to me to my next question. Updating the old parts on crossovers. These are ancient I can imagine capacitors need to be changed out. Thoughts?
    I think you will need to consider whether you want a more accurate monitor(4412)versus old style fun monitor(4312). IMHO I would go for a 4412 crossover or an Alpha S70 as opposed to the old 4312 crossover.

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