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<blockquote data-quote="John Roberts" data-source="post: 49080" data-attributes="member: 126">Re: Multi building 70volt system - is this normal?Most, not all constant voltage systems are full isolated (floating). Speaker lines often get grounded inadvertently, so the full floating helps avoid service calls until and unless both sides get grounded. It seems a speaker transformer could be repurposed as a signal step down transformer (if its a real transformer) while they surely make and sell dedicated transformers for exactly that. it&#039;s only money..&nbsp; Surely some modern solutions exist, but nothing is free. While It depends on your sensibility, a cheap MI mixer with four proper mic preamps could be added for &lt;$100. There are also small install mixers that do the same thing, perhaps a little more expensive. there are lots and lots of products dedicated to that market. Sounds like a learning opportunity..&nbsp; only concern is if the basic system is near the end of it&#039;s life, and the owner gets some unrealistic expectation of future service life from money spent doing this clean up. Of course any work you do on wiring and speakers should still be usable, if amps need replacing later. JR</blockquote>

[QUOTE="John Roberts, post: 49080, member: 126"] Re: Multi building 70volt system - is this normal? Most, not all constant voltage systems are full isolated (floating). Speaker lines often get grounded inadvertently, so the full floating helps avoid service calls until and unless both sides get grounded. It seems a speaker transformer could be repurposed as a signal step down transformer (if its a real transformer) while they surely make and sell dedicated transformers for exactly that. it's only money.. Surely some modern solutions exist, but nothing is free. While It depends on your sensibility, a cheap MI mixer with four proper mic preamps could be added for <$100. There are also small install mixers that do the same thing, perhaps a little more expensive. there are lots and lots of products dedicated to that market. Sounds like a learning opportunity.. only concern is if the basic system is near the end of it's life, and the owner gets some unrealistic expectation of future service life from money spent doing this clean up. Of course any work you do on wiring and speakers should still be usable, if amps need replacing later. JR [/QUOTE]

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