I have a 100v external horn which i've pictured below and also have a slave 100v amp which i've also pictured below. My sound input will go into Slave in RCA sockets. The External horn has Brown and Blue wires, where would I connect this to? I'm assuming the COM & 100V pins on the amp and leave out the middle 8ohm connection? If so which one will go to com and which to 100V? the horn also seems to have variable wattage, what should I set it to? The link to the amp is here

