Yes your zone 2 approach will work.
download and read the 5a manual
you must know the input impedence of the power amp you use for zone 2
that power amp must have rca inputs.
consult table on M5 filters to set dip switches inside each M5
download and read the 5a manual
you must know the input impedence of the power amp you use for zone 2
that power amp must have rca inputs.
consult table on M5 filters to set dip switches inside each M5