Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Bradford "BJ" James]

Hi,
I'm going over to a local service club to replace their fried 70v mixer/amp. Just curious: since I don't actually have access to the speakers(in the suspended ceiling)is there a way to check to make sure what wire is the common and which is the 70v? All I have access to is the 2 wires coming out of the wall, and they're not labelled. Can I f*** anything up having the wires crossed?

[Joseph Macry]

Shouldn't matter.  If you get them backwards, you've simply reversed polarity and no one will notice.  As long as everything is equally out of polarity....

[Phil LaDue]

By suspended ceiling do you mean grid and tile?

[Bradford "BJ" James]

re ceiling:Yes.
And ya once I got thinking about it, it would only reverse polarity....no biggie.
Thanks,
BJ

[Brad Weber]

Perhaps a little obvious, but couldn't you simply look at what is connected to what on the existing amp or look at the system documentation?

[Hal Bissinger/COMSYSTEC]

When I install a system I normally prefer to use wire that has black and red conductors, however I have used black and white if necessary. Either case black is always the common, (-) or ground. This allows you to get the speakers wired the same and in phase. It doesn't matter which way you connect it to the amp  output (assuming only one amp) but good practice is to follow the same convention.

Of course the typical hack job uses lamp cord or something just as bad so if that's the case all bets are off.

-Hal

[Bradford "BJ" James]

Amp is fried, I'm not sure it was connected properly to start with. It's just a crappy little radio shack amp though- failure was imminent.

[Hal Bissinger/COMSYSTEC]

You just might want to check to see that there are line transformers on each speaker and they are connected properly before you replace that amp. But then again that's just me...

-Hal

[Don Boone]

It's TOA Z-104 time.

Don

[Rain Jaudon]

http://www.markertek.com/Product.asp?cat=TESTTOOLS&subca t=&prodclass=AUDIOTEST&baseitem=ZM-104&search=0& amp;off=0&showreturn=0&utm_source=gbase&utm_medi um=shoppingengine&utm_term=&utm_content=&utm_cam paign=sf

TOA ZM-104