First off, you must accept that all the sources must be configured for momo reproduction.
For a commercial multi-zone system with zoned volume controls, the easiest and most reliable system would be to use a commercial mixer amp with several inputs and a 70 volt speaker output and wall mounted attenuators for each zone.
These are the traditional systems used commercially everywhere. There are ceiling mounted and wall mount speakers with integral 70 volt matching transformers. These allow you to run any number of speakers and remote zone volume controls as long as you do not exceed the total wattage of the amp. Speaker impedance is unimportant.
The mixer portion of the amp allows you to have each source on a separate input so you can easily select the source and the volume. You can even dedicate one or more inputs for a paging microphone.
For a commercial multi-zone system with zoned volume controls, the easiest and most reliable system would be to use a commercial mixer amp with several inputs and a 70 volt speaker output and wall mounted attenuators for each zone.
These are the traditional systems used commercially everywhere. There are ceiling mounted and wall mount speakers with integral 70 volt matching transformers. These allow you to run any number of speakers and remote zone volume controls as long as you do not exceed the total wattage of the amp. Speaker impedance is unimportant.
The mixer portion of the amp allows you to have each source on a separate input so you can easily select the source and the volume. You can even dedicate one or more inputs for a paging microphone.