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In Reply to: RE: JBL 16 ohm dirver that measerus 6.7 posted by Paully on July 20, 2016 at 18:59:49
you may have to open them up and see if both diaphragms have the same material and surround style - if I were still playing with stuff, I'd like to know of a decent/cheap priced aftermarket diaphragm. I've got a pair of 2420 which look rough paint-wise w/o diaphragms which were re-charged at Great Plains Audio.
Karlson Evangelist
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The ones that measure low are ones I was considering purchasing. They don't sound like they are worth the risk.
You really don't know anything for sure about those drivers.
I know in some cases JBL sold drivers and diphragms that were labelled 16 ohms, then later 8 ohms, and they all measured EXACTLY the same at 1000 hz.
But, they could also be both damaged. I've seen damaged voice coils that measure much lower than original impedance due to some scraping of coil which allowed adjacent coils to short, lowering impedance.
As was said above, the one thing you know for sure is that the very low measuring one is bad.
The only way to know for sure with these things is to measure impedance properly, with an impedance meter (LCR bridge being ideal) using an AC signal in the range the driver operates, and measuring sensitivity of the driver. .
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