Planar Speaker Asylum

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Planar Speaker Asylum

Ribbon tweeter

218.250.116.213

I have a pair of Aurum Cantus G2 ribbon tweeter and according to the specification their impendance is 8 ohm. But their impedance measured with a multimeter is only 0.4 ohm. I don't know if it's damaged but there's sound when I measure them. Grateful for your advice please.

Follow Ups:

RE: Ribbon tweeter - stevenwmc 19:38:39 09/24/12 (0)
Thanks for the advice. I believe there's a transformer in between that's why the measured resistance is so low.
Along the lines of Josh358's post - neolith 16:31:05 09/24/12 (0)
The tweeters could be wired with a 2nd order HP filter, which would put an inductor in parallel with the speaker and essentially you are measuring the inductor and not the tweeter.
Details: if R is the resistance of the tweeter and r is the DCR of the parallel inductor then the total resistance Z = r*R/(R+r) and since R > > r this reduces to Z=r.
To get the true resistance of the ribbon, you will have to disconnect the filter.

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RE: Ribbon tweeter - josh358 11:26:32 09/24/12 (0)
Is there a transformer in them? You may be measuring the resistance of the transformer primary, rather than the impedance of the speaker at audio frequencies.

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