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Author Topic: testing 70 volt speakers  (Read 3187 times)

David Haulman

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testing 70 volt speakers
« on: October 06, 2014, 07:09:57 pm »

This customer got a building with some ceiling mounted speakers in it. They appear to be 70 volt. Can I take a small amp with 70 volt output; hook up the speakers and put a tone thru the amp just to see if they all work? no gonna drive it hard. just wanna check them.Any thoughts?
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John Roberts {JR}

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Re: testing 70 volt speakers
« Reply #1 on: October 06, 2014, 07:27:59 pm »

Yes.. they may not get very loud but you can confirm they do not have rubs or open VC,

JR
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Ivan Beaver

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Re: testing 70 volt speakers
« Reply #2 on: October 06, 2014, 07:33:31 pm »

This customer got a building with some ceiling mounted speakers in it. They appear to be 70 volt. Can I take a small amp with 70 volt output; hook up the speakers and put a tone thru the amp just to see if they all work? no gonna drive it hard. just wanna check them.Any thoughts?
You could use a normal amp to do that test.  The level may be lower than what you would normally expect from the amp-due to the higher impedance.

So by your statement-I assume there is no amp in place.

To me the FIRST thing I would do would be to do an impedance SWEEP-NOT a DC resistance reading.

This way you can get an idea of what the total load presented to the amplifier would be-assuming the speakers are all properly tapped.

That is the only way you have to get an idea of what size amp you should use.
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David Haulman

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Re: testing 70 volt speakers
« Reply #3 on: October 11, 2014, 04:53:00 pm »

You could use a normal amp to do that test.  The level may be lower than what you would normally expect from the amp-due to the higher impedance.

So by your statement-I assume there is no amp in place.

To me the FIRST thing I would do would be to do an impedance SWEEP-NOT a DC resistance reading.

This way you can get an idea of what the total load presented to the amplifier would be-assuming the speakers are all properly tapped.

That is the only way you have to get an idea of what size amp you should use.
Yeah. I see. No amp at location. I checked a few of them when I had the lift. I think it will work. Thanks for your Help!
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ProSoundWeb Community

Re: testing 70 volt speakers
« Reply #3 on: October 11, 2014, 04:53:00 pm »


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