Page port noise

[Dolphy]

Hy

We've setup a few systems with Paging on an analog port (set as paging). When we connect an amplifier system (different kind of amplifier) for paging in speakers, there is always a little noise coming out from the speaker. I read some posts about this issue and some of them mentionned the need of adding a UPAM (witch I guess it's a kind of noise reducer) but all the posts where a few years ago. So I was wandering if, today, they were a configuration in the IPO instead of adding a module to make it work properly?

Thanks

P.S. Systems are IPO 500 v2 r7

 

[mforrence]

We ALWAYS use an isolation transformer such as Bogen WMT1A between IPO and any external paging equipment. If you pull the cross-connect to IPO, does the speaker noise go away?
Mike

 

[Dolphy]

Thanks Mike,

Yes it still does the noise when we unplug thé crossconnect cable. Even when we put our testsets directly in the paging port, we heard the noise!

 

[mforrence]

So, if you disconnect the IPO from amplifier and you still hear the noise from the speakers (is that what you are saying?) - then the trouble is in the amplifier/speaker setup.
Mike