Home Intercom Retrofit

I recently moved into a home with an old M&S Model 350 intercom. The
Speakers all seem to work ok, but the master unit is in bad shape. It
doesn't turn off the program/set time buttons do not work.
I found the DCM3-4 unit online as a retrofit replacement. This looks
like it'll work, but everything I see regarding the installation
indicates that I have to replace ALL the Speaker stations as well.
After inspecing one of the speaker I'm puzzled as to why. The unit is
extremely simple, the speaker with a switch to toggle between a
speaker and mic setting.
Can anyone tell me why you would make the old speaker incompatible with
the old system.
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That is correct. The old room station speakers are not compatible with the new DCM3-4 system.
It's just the way they designed the new system. A cynical person might be inclined to believe they just wanted to sell more new stations. I spoke to my M&S rep and he seems to think that's the reason, too. If you need help configuring a setup, feel free to contact me. I carry M&S though I haven't put all of the components online yet.
Reply to
Robert L. Bass
True, M&S does use 45-Ohm speakers. 45-Ohm "speaker only" stations from the old system can be used with the new system. However, anything with "talk" / "listen" buttons will need to be replaced. I spoke with M&S tech support and they confirm this.
Reply to
Robert L. Bass
One answer might be, emphasis on the "might," is that some systems use 45ohm speakers and some use 4ohm speakers. Will this be a show stopper? Maybe. It depends on amp power, etc. If it were me, I would get a schematic of the new, and if you can, the old, and go from there.
Robert L. Bass wrote:
Reply to
Art Todesco

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