Hey everyone, just bought an A9 head with the Siren/PA amp and what I think are the necessary cables. The Siren/PA amp is marked Systems 9000 and includes the proper Systems 9000 interface cord, and I also had a left-over Motorola style power plug from some vehicle strips. For now I just intend to utilize the Control head for Siren purposes, so is this all I need for a proper install of the system?