extra siren and strobe connections on accenta panel?

hi, I have an alarm system fitted (accenta panel/ pyronix deltabell), and have added an extra zone for the garage. the zone side is up and running but want to connect an extra separate siren and strobe on the garage itself. I have 2cores available for each, but am unsure of connections from the usual str+/-, T A D B. would these be able to be added on without overloading the circuit? is is not a large system, 3 pir's + 3 door contacts. thanks