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Thread: Genesis tweeter attenuator value

  1. #1

    Genesis tweeter attenuator value

    Hi everyone.
    Recently got myself a set old of Genesis 400 + center + sub.
    The speakers have an attenuator on the back, and from what I can tell it controls the volume of the rear firing tweeter.
    All the drivers work well, but I think the attenuator is faulty. When you turn it, there is no sound from the tweeters. When you stop turning, sometimes there's sound and sometimes there's no sound.
    I want to replace the attenuator, but don't know the values.
    I've tried measuring it, but not able to, since it normally shows open circuit.
    I know there's no schematics for the 400, but I'm hoping there's enough knowledge out there to be able to allow me to find a replacement
    I figure all I need to know is a resistance value, power rating, and log or linear
    Can someone please help me suggest a replacement.
    I can upload photos if that helps.

    Thanks

  2. #2
    [Industry Expert] ddk's Avatar
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    Gary Koh is the current owner of Genesis and a member here, send him a PM he’s usually responsive to people.
    http://www.whatsbestforum.com/member.php?397-garylkoh

    david
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  3. #3
    VIP/Donor [VIP/Donor] andromedaaudio's Avatar
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    Indeed best is ask the company off course, but older equipment what hasnt been used for a while can have a bit of corrosion built up.
    You can use contact spray for electronic contacts , see if you can spray inside the attenuator , wait a while and power it on.
    Its cheap and simple and might solve it

  4. #4
    WBF Technical Expert (Speakers & Audio Equipment)/Member Sponsor [Technical Expert] garylkoh's Avatar
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    You could try as andromeda suggested and use a contact cleaner like the CAIG Deoxit Pro Gold. However, if you measured an open circuit, the previous owner might have used it a lot, wearing it out.

    I don't know what is used in the G400, but a 10W wire-wound 1 ohm linear pot should work. The Genesis tweeter is a 4 ohm ribbon (purely resistive) so the 1 ohm gives is a 3dB range.
    __________________________
    Gary L Koh, CEO and Chief Designer,
    Genesis Advanced Technologies

  5. #5
    Quote Originally Posted by garylkoh View Post
    You could try as andromeda suggested and use a contact cleaner like the CAIG Deoxit Pro Gold. However, if you measured an open circuit, the previous owner might have used it a lot, wearing it out.

    I don't know what is used in the G400, but a 10W wire-wound 1 ohm linear pot should work. The Genesis tweeter is a 4 ohm ribbon (purely resistive) so the 1 ohm gives is a 3dB range.
    Thanks for that Gary.
    I've been searching for a 10W wirewound 1 ohm linear pot, but not been able to find any. They all seem to be 1k, 10k, 1M etc. Am I searching for the wrong thing? Or is it a very specialised item?

  6. #6
    [Industry Expert] Member Sponsor Addicted to Best!
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    Quote Originally Posted by Puunda View Post
    Thanks for that Gary.
    I've been searching for a 10W wirewound 1 ohm linear pot, but not been able to find any. They all seem to be 1k, 10k, 1M etc. Am I searching for the wrong thing? Or is it a very specialised item?
    Puunda - contact our customer service through our website : https://www.genesisloudspeakers.com/contact-us/

    I am happy to send you one if you pay for the shipping / postage.
    Carolyn "The sister" Koh
    COO, Genesis Advanced Technologies, Inc.
    Genesis Advanced Technologies
    Absolute Fidelity Cables

  7. #7
    WBF Technical Expert (Speakers & Audio Equipment)/Member Sponsor [Technical Expert] garylkoh's Avatar
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    Errr...... our current pots might not fit the old G400. That speaker is over 20 years old, and if I remember correctly, the old G-III used a different size and type of pot than what we currently use.

    But, like Carol said. If you pay shipping/postage we'll be happy to send one out to you.
    __________________________
    Gary L Koh, CEO and Chief Designer,
    Genesis Advanced Technologies

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