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Author Topic: Trying to determine 8ohm or 70 volt setting on inaccessible speakers  (Read 11265 times)

Tom Bourke

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Re: Trying to determine 8ohm or 70 volt setting on inaccessible speakers
« Reply #10 on: March 24, 2014, 05:52:26 pm »

Can you measure the DC resistance of one?  If it is close to 8 Ohm, then it doesn't matter. If it is much higher, then take power rating, multiply the resistance, and take square root of that product.  V^2 = P * R.
DC resistance is useless in this context.  It could be well under 8 Ohms even with transformers.
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Sean Chen

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Re: Trying to determine 8ohm or 70 volt setting on inaccessible speakers
« Reply #11 on: March 24, 2014, 09:14:20 pm »

DC resistance is useless in this context.  It could be well under 8 Ohms even with transformers.

Thanks for your correction. I learned something.
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David Sturzenbecher

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Re: Trying to determine 8ohm or 70 volt setting on inaccessible speakers
« Reply #12 on: March 24, 2014, 10:24:19 pm »

Sean
Remember that at DC a transformer will read very close to zero ohms across the primary , add that to the low resistance of the speaker line and you may easily get below an ohm with a standard DMM on a 70V ( or 25v or 100v) system.
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Re: Trying to determine 8ohm or 70 volt setting on inaccessible speakers
« Reply #12 on: March 24, 2014, 10:24:19 pm »


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