I have a 40hp 10/10 port siren like yours from Phoenix. Both motors are Westinghouse brand and the siren is in excellent condition. I'm pretty sure the 10/10 port siren is a lot louder than the 9 port, the rotors are a lot wider. https://i.imgur.com/kn0l2NH_d.jpg?maxwidth=640&shape=thumb&fid...