we have an older model that is similar to the RM20/RM22 that you show that was installed in our home in 1972 by the previous owner. Clearly a good model because it still works.....however it needs to be updated . Hat do you recommend. There is a front door intercom.....and two other speakers in different areas of the house. It only is equipped with am/ fm radio capacity are there any other options like cd capacity.
Thanking you in advance for your time and help.
Most sincerely,
Pat Vaughn