Problem with a speakers impedance

Leonkara · 6th March 2012, 09:55 PM

Could someone please tell me why the impedance of a speaker as measured
by a digital multimeter is 4 to 5 ohms but if i just hit the side of the speaker
with my palm the resistance drops to 0,1 ohms.Is this normal ?
The speaker is a three way Fj forte piano.
I measured another speaker to 6-7 ohms and if i move the woofer cone
with my hand the resistance rises.
Is there an odd behavior around the crossover section that doesn't tolerate
any shock ?
I must say that a krell connected to the fj's had two fuses burned.

sofaspud · 6th March 2012, 10:06 PM

My guess... a coil moving in a magnetic field produces a current which may either add or subtract from the current from the DMM.

Leonkara · 6th March 2012, 10:11 PM

Thanks for the reply.
Well obviously this is normal but a resistance of just 0,1 ohm is a short circuit
and the krell agreed.

6th March 2012, 09:55 PM	#1
Leonkara diyAudio Member Join Date: Dec 2011	Problem with a speakers impedance Could someone please tell me why the impedance of a speaker as measured by a digital multimeter is 4 to 5 ohms but if i just hit the side of the speaker with my palm the resistance drops to 0,1 ohms.Is this normal ? The speaker is a three way Fj forte piano. I measured another speaker to 6-7 ohms and if i move the woofer cone with my hand the resistance rises. Is there an odd behavior around the crossover section that doesn't tolerate any shock ? I must say that a krell connected to the fj's had two fuses burned.

6th March 2012, 10:06 PM	#2
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	My guess... a coil moving in a magnetic field produces a current which may either add or subtract from the current from the DMM. __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

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6th March 2012, 10:11 PM	#3
Leonkara diyAudio Member Join Date: Dec 2011	Thanks for the reply. Well obviously this is normal but a resistance of just 0,1 ohm is a short circuit and the krell agreed.