Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: ManisMan on November 06, 2017, 09:56:25 pm

Title: Replacing speakers with mystery salvage parts. Impedance?
Post by: ManisMan on November 06, 2017, 09:56:25 pm

How do you find the impedance of a speaker? Are you just supposed to know, or have some stamp on the speaker body, or is there a method of testing it?

Title: Re: Replacing speakers with mystery salvage parts. Impedance?
Post by: jjasilli on November 06, 2017, 10:00:38 pm

Measure its resistance with a DMM.  This fixed resistance will be about 2/3 of its impedance rating.  E.g., an 8 Ohm speaker will have a fixed resistance reading of about 6 Ohms.

Title: Re: Replacing speakers with mystery salvage parts. Impedance?
Post by: ManisMan on November 06, 2017, 10:09:34 pm

Thanks