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In Reply to: RE: JBL 16 ohm dirver that measerus 6.7 posted by Paully on July 20, 2016 at 18:47:57
6.5Ω ±10%
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It is within JBLs margins but I think the confusion arose because 6.5Ω dc is abnormally low for a 16Ω unit and typical for what usually be called an 8Ω one.For a nominally 16Ω unit I would expect a dc resistance between 10 and 13Ω.
PS: For some reason the omega sign is converted into a copyright symbol and a weird I by this site. Although it did revert back to an omega after the third time I looked at the post. Strange...
Edits: 07/21/16 07/21/16 07/21/16
If the horn provides an optimal-efficiency load, then the "air load" on the diaphragm will cause the impedance to be about twice the DCR, in the pass band of the driver/horn. Voice coil inductance adds a bit more, so the values are not unreasonable for the kind of horns used in pro audio. Horns that optimize audio fidelity, or pattern control, or other goals than efficiency, may not provide that much impedance.
Bottom line, the impedance you care about (for crossover matching) can only be measured with a horn attached, and are only valid for that horn.
Exactly. Thanks.
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