Batboard

We are buildong a new fire station and want to run some other speakers in some fo the offices upstairs from the radio room. We want some white flat speakers to mount in a wall with volume controls and we are not using a 70 volt pa system just speakers with their own volume control. Any help is greatly appreciated thanks.

tcash158 wrote:We are buildong a new fire station and want to run some other speakers in some fo the offices upstairs from the radio room. We want some white flat speakers to mount in a wall with volume controls and we are not using a 70 volt pa system just speakers with their own volume control. Any help is greatly appreciated thanks.

If you try to wire a number of parallel speakers directly to the radio (or channel card), you will drag the impedence down to the point of failure. Try running receiver audio though the PA that you use for your Station Alerting/House Mike system. Set the radio input module for a lower priority than either the Station Alerting or House Mike inputs (so that the latter take precedence).

Then you need a 70v public address amplifier. They aren't that expensive, and they stop a lot of heartache. A 25w amp will run four speakers around the station and a couple horns out in the bay each with it's own vol control nice and loud. It's just what you need. Don't try to do anything else.

We dont have a station alerting system its an all volunteer dept and we just want to be able to adjust the volume and listen to the radio audio from the radio room radio in an upstairs office and the radio is mounted downstairs.

But, lots of wire with some speakers and volume controls at the end is an invitation for a service call. In the very least use some 70v transformers to divide the little power the radio audio amp has evenly among the speakers. It won't be loud, but it will be okay.

Here's a picture of a basic 70v system using your audio amp in the radio to feed other speakers in the building through Radio Shack transformers.



http://www.horrorseek.com/home/hallowee ... akers.html