PA speaker horn attenuator fried, where to get one?

Discussion in 'Amps [BG]' started by rojo412, Mar 27, 2014.


  1. rojo412

    rojo412 MARK IT ZERO! Supporting Member

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    Last week at practice, a horrid burning smell wafted through the jam room. Turns out, the PA speaker had a horn attenuator that decided to almost catch fire.

    It's a Fender 1275A speaker and the part has "AT-68 L-16(ohm sign)" on it. Since these are ancient speakers, I didn't see an easy to find source for a new one.

    Anyone have a suggestion on what to do for a replacement? And where I could get one?
  2. tkonbass

    tkonbass I'm just one of the out-of-focus guys. Gold Supporting Member

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  3. David Jayne

    David Jayne

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    Or just omit it and wire direct to the horn. If you can still get it to sound good, you're done.
  4. Bassamatic

    Bassamatic keepin' the beat since the 60's Supporting Member

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    NO - you cannot wire directly to the horn unless it is a Piezo horn. Connecting a regular horn in parallel with the woofer will cause a huge drop in impedance around the crossover point. It may also be unbearably loud.

    This is a 16 Ohm L-Pad. They are designed to keep the impedance constant at 16 Ohms wherever it is set. Get a replacement from parts express or on eBay, etc. Maybe even Radio Shack. Maker sure it has decent power handling capability. I don't know what the speaker's power handling rating is, but the L-Pad should be 10-20% of that (most power goes to the woofer). Bigger is not a problem, it is safer.
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  6. rojo412

    rojo412 MARK IT ZERO! Supporting Member

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    Thanks, everyone!
  7. Cirk

    Cirk

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    Could also blow the tweeter by not using an L pad. Best bet is to disconnect it until you can fix it properly.
  8. rojo412

    rojo412 MARK IT ZERO! Supporting Member

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    When it almost caught fire, I cut the wires to it and we threw it outside.
    So if I find a 16-ohm L Pad with a hefty power rating, I'm good? It's a 100w speaker.
  9. tkonbass

    tkonbass I'm just one of the out-of-focus guys. Gold Supporting Member

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  10. David Jayne

    David Jayne

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    Which it almost certainly is.
  11. rojo412

    rojo412 MARK IT ZERO! Supporting Member

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    Here's a link to the manual/spec sheet

    I was on parts express and found a 50w attenuator and a 100w attenuator in 16ohm, but that was it. Are those too powerful for this? You said 15-20% rating of the whole speaker (which is 100w)?
  12. sconix

    sconix Supporting Member

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