Everythin was amped in my last car dude,never happened to see a switch or anythin like that. I tried a speaker i found but it was a tad wet & scabby so no idea weather it worked or not,which doesnt help really does it.lol.
Ok right,just got my brain back out.underneath theres a sunken switch that says eq/div and norm on it.
So the manual says:
System Switch. When connecting an equiliser or divider using AI-NET feature,place this switch in the EQ/DIV position.When no device is connected.leave the switch in the NORM position