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Thread: D-130 cone

  1. #1
    Junior Member
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    CHARLOTTE, NC
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    D-130 cone

    I have and old JBL D130 with the ID tag missing. The only number on the speaker is 21057 stamped on the back side of the cone. How do I check the impedance of the speaker and what does 21057 represent? How old is the speaker?
    Thanks, Wayne

  2. #2
    Senior Member
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    Measure the DC resistance across the speaker terminals. Actual impedance is a little higher than the DC resistance.

    For example: 5 or 6 ohms DC resistance means it's an 8 ohm speaker, 11 or 12 ohms would be a 16 ohm speaker.

    The 21057 (if it's original) would be the JBL part number from Hawley cones.

  3. #3
    Junior Member
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    JBL D-130

    Thanks Harvey, very helpful! I'm installing the D-130 in a guitar amp that can go 8 or 16 ohms imped. This D-130 measures 7.4 ohms DC so I'll set the amp up for 8 ohms.
    Thanks again,
    Wayne

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