Homes with intercom systems already in place can easily upgrade to the DMC3-4
Music/Communication Retrofit System from Linear.
The DMC3-4 is a full-function residential intercom and music distribution system that
furnishes rich sound for music and voice throughout the home. It has the ability to
communicate and monitor up to 15 rooms, and supplies digitally-tuned AM/FM
radio to each of them.
Because it connects to existing wires, this system can easily replace most older intercoms, including 3-wire or 4-wire M&S and NuTone systems, without the need to repair drywall.