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Thread: 123a woofer crossover

  1. #1
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    123a woofer crossover

    A friend has a pair of L-88 woofers and would like me to help him build a 2way diy for fun. I do not want to let the woofer run open like the L-88/100 series but would like to cross it over approx 1500-1800hz. We do not have any measuring equipment and I have searched for a viable crossover ...Troels has 1500 which is unpublished ... Dennis Murphy did a 950 and the S70 Alpha is 1200. The reason for the cut-off desired is that we are going to cross the woofer to a Fountek Pro 5i ribbon tweeter that should not be crossed less than 1500( Stones Audio will help us with the ribbon end).

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    No one has ever attached an inductor to a 123a/2213......and measured the response?

  3. #3
    Senior Member grumpy's Avatar
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    You could assume 8 or 16 ohms and use any internet crossover calculator.
    With just an inductor, it won't roll off very fast (beyond its inherent response),
    so being "off" a bit won't matter a lot.

    You might try to find an impedance and frequency response plot set for the driver.
    It would help.

  4. #4
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    The Le is about .6mH on 123A and so you'll want to incorporate that into your calculation. It's a great woofer to run wide, but you'll want to be careful not to overdo it when designing a crossover, keep in mind that it'll have a narrow beamwidth above 1200hz (where it should be about 90 degrees).

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