Radio Multiple Remote Speakers

[JD]

I have a customer who wants 4 to 5 remote indoor speakers run into 5 seperate rooms from the VHF base radio. What type of audio balancing equipment would anyone recommend and where to buy this equioment ?
Thanks.

[MSS-Dave]

There were several threads on this over the last couple of years. This one is the first I found and probably will answer most if not all of your questions....

http://batboard.batlabs.com/viewtopic.p ... ransformer

Dave

[Bill_G]

Yep. Good answer. That's how you do it. radio ==> 70v amp ==> 70v xfrmr + spkrs. Run the lines to the spkrs as far as you need.

[Bigred]

I have done a lot of 70v systems in my time, but I think the self amplified systems are
easier to set up and work very well. Have a look...

http://www.valcom.com/techsupport/speak ... eakers.htm

[Tom in D.C.]

One more thing. If you're running a 70-volt system in each of five rooms, odds are you'll need a different sound level in each room due to ambient noise in the room. Two easy ways to control the level are 1.) to have a stepped attenuator/transformer nearby in the wall, mounted just like a light switch or, 2. have a similar level control mounted in the ceiling or wall speaker, which makes for less wiring. Nice thing about the adjustment being on the speaker is that you can also get them with screwdriver adjustments to discourage people messing with the setting. We used to just take the knobs off but later on the screwdriver pots were made available.
The speaker manufacturers have all this stuff in their catalogs; meaning people like Lowell, and whatever Soundolier is calling itself these days. All very common stuff that any decent electrical supply house can get for you and at fair prices too, meaning 'way below list because they always get off-sheet pricing from the manufacturers. So dig through the catalogs and if you can imagine it odds are it's available in this type of equipment.

[com501]

Grainger

Newark

You name it.

This is how we setup ALL fire stations. Even different shifts sometimes want different volume levels per room.....