atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services Security, Alarms and Paging 2 wire Bogen with 4 Wire Valcom

I am wondering if I can use both 2 Wire 70V paging and 4 Wire 24 V Valcom

By sharing the same output

Customer wants to add additional paging horns to the outside of each building

I am a little concerned about possibly overloading TOA 724 Amplifier

So I was thinking of just using Valcom 24 v paging horns

Just for outside

any thoughts

Thanks



JD

What's your load on the 724 Amplifier? How many horns at what wattage do you want to add. Is that TOA a 240 Watt unit? If so, you may have a lot of unused power in there. Put an impedance meter on the circuit and go from there.

Sam

Hi Sam

Thanks for responding. Can you recommend and impedance media that I can buy?

I think they have a newer version digital versus Analog

Thanks

JD

This is a good impedance meter..https://dedicatedpresentation.com/toa-zm-104-a-impedance-bridge

But I am confused. Are you adding Valcom horns to the TOA amp, or standard 70V horns to the TOA Amp?

If you decide that you want to install 4-wire self-amplified speakers because you're worried that additional 70-volt speakers would overload the existing amplifier, you're going to need an adapter to tap off of the 70-volt speaker line and convert to a suitable impedance to feed the input of the 4-wire self-amplified speakers.

Something like V-1095 70V Paging Expander
https://www.valcom.com/products/productdetail/v-1095

Ok

So I guess I’m gonna measure the impedance and see if there’s any more room

I thought I could just double tap the audio output from Algo 8301 and send one into the amplifier for the 70 V system and then one into the Valcom for the 24 V system

I want to add three additional Paging horns to each building I believe each building currently has (1) Bogen 15w horns on out front

Bogen 15w tapped at 7.5

I still am not sure what you're trying to do, but let us know what your impedance readings are and we can take it from there.

I'm thinking that if you split the output from the telephone system before the amp that it shouldn't be a problem.

The Algo should be able to do just what you want. You may need to have 2 Algo units unless you can separate the output on the 8301

Ok

So I went out to the site with my new impedance meter TOA -ZM -104
I disconnected the speaker leads from the amp, connected it to the meter
I never heard tone coming through any of the speakers

The meter immediately went to zero ohms at 10X

Then it went to 10 Ohms I believe I was at 1X

I’m not 100 % sure on how to calculate

But I think I might be using about 200 Watts

Why, no tone I thought this was so you could tell if any of the speakers were disconnected or causing an issue



Thanks

JD