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Joined: Aug 2003
Posts: 268
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I have a school with a very old Simplex/Bogen talkback system and Dukane 9935a speakers. They would like to add two more speakers to the system. There are enough switches in the Bogen MCP35 Unit, but what type of speakers will work in this scenario. Any help would be greatly appreciated!
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Joined: Jan 2010
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You will need speakers with a 25 volt matching transformer on the back.
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Joined: Aug 2003
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Thanks for the response, and forgive my ignorance on this system, as it was probably installed before I was born, but is this simply a two wire setup as in a one-way system, and the SBA225 room selector panel handles the magic of making the speaker a microphone for talkback?
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Joined: Feb 2005
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Speakers make good microphones. All you have to do is connect it the the INPUT of an amplifier. The "magic" is simply a switch that transfers the speaker to the output or the input depending on whether you are talking or listening. It's a basic intercom setup.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: Jan 2010
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Mickamg, for lack of a better explanation...yes. The magic is actually inside the MCP35 master panel and not in the switch bank. You do not need anything other than an industry standard 25-volt loudspeaker such as the Dukane model 5A607.
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