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Author Topic: 70 volt system miswired  (Read 3179 times)

Dwight Campbell

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70 volt system miswired
« on: May 04, 2006, 12:11:52 pm »

hello all,

what would be the result of the amplified speaker line being connected to 2 of the primary taps on the transformer and nothing being wired to the common?
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Dwight Campbell
A/V Installation Manager
Knoxville, TN

John Roberts {JR}

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Re: 70 volt system miswired
« Reply #1 on: May 04, 2006, 01:13:34 pm »

Dwight Campbell wrote on Thu, 04 May 2006 11:11

hello all,

what would be the result of the amplified speaker line being connected to 2 of the primary taps on the transformer and nothing being wired to the common?



An obviously incorrect turns ratio.. probably presenting an improper loading/termination of the 70V line.

JR
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Don Boone

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Re: 70 volt system miswired
« Reply #2 on: May 04, 2006, 04:28:38 pm »

Lowered volume and possibly overloaded amp. Give more details and we can get a better idea of what you are facing.


Don (who once had a new guy install over 280 speakers in an 11 story building by correctly connecting to the common and 2-watt tap then wirenut all the other taps together)
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Mac Kerr

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Re: 70 volt system miswired
« Reply #3 on: May 04, 2006, 04:32:32 pm »

Don Boone wrote on Thu, 04 May 2006 16:28

Don (who once had a new guy install over 280 speakers in an 11 story building by correctly connecting to the common and 2-watt tap then wirenut all the other taps together)
That beats me. I once had a crew hired to build about 80 70V speakers to hang above a trade show display area do exactly the same thing!

Mac
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Al Clayton

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Re: 70 volt system miswired
« Reply #4 on: July 27, 2006, 02:04:28 pm »

Mac & Don

If you are in this business long enough, you're going to have that happen!  I now include a wiring diagram with every 25/70 volt speaker job that leaves my office.

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Don Boone

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Re: 70 volt system miswired
« Reply #5 on: July 27, 2006, 09:22:03 pm »

And I see you are one of the few here like me that use
shielded cable for 70 volt. It's rarely a problem on small
systems and occasionally saves you from having to completely
rewire because of some unforseen noise source.

Don
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