Outdoor Siren Wiring

Hi, This may seem like a daft question, so recently bought new house and finally got round to putting up the Ring Cameras and Alarm, I've installed my ring alarm, along side the existing ADE Accenta G3 alarm, which ive not got any codes for, its was left disarmed when moved in.. and is installed on its own mccb. I have removed the 2 external existing sirens and left the 5 cables in situ isolated and installed ring siren in same location, Is possible to use the existing 12v cables (2 out 5 cables to wire up my Ring Sirens? Obviously it means leaving the G3 unit powered as i would assume it has transformer located in it to power existing sirens? Current cables assume its red and black on right?