Altec 288C and 1005B impedance at 630 hz

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Hi

My Altec 288C have genuine 24 ohms aluminum diaphragms.
I made impedance measurement with an Altec 1005B tar filled at 630 hz. The results I had with both drivers is 141 ohms !!! (seems really high)

Here what I've done to measure the impedance.

I placed a 1000 ohm pot in series with the 288C. I injected a 630hz sinewave to feed the amp with driver and looked at the ac voltage across the pot and the driver. I adjusted the pot so I had the same voltage across the pot and the driver. Last, I measured the resistance of the pot to get the results.

AC voltages were taken with my Fluke 24. I tried another multimeter and it was the same.

As 141 ohms seems high, does it mean I can't measure correct voltage at 630 hz with my multimeter or 141 ohm is normal ?

Thanks

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Topic - Altec 288C and 1005B impedance at 630 hz - legarem 19:17:48 07/10/14 (3)

JBL - djk 23:18:28 07/11/14 (0)

RE: Altec 288C and 1005B impedance at 630 hz - Tre' 21:28:59 07/10/14 (1)

RE: Altec 288C and 1005B impedance at 630 hz - amandarae 15:38:59 07/14/14 (0)

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