ppi amp

My Polk 4 channel burnt up last night and I'm going to use this oldschool ppi 2360 2 channel I have but my question is on the amp it has a 2 channels for speaker imputs an 2 for speaker outputs and I'm not sure what this means. I'm assuming one is for tweeters an one is for mids but I'm running...

ppi pc 1800.2 for sale perfect condition like new 350 shipped or make a offer email me at matix1125@gmail.com

Hey guys, im running some old school ppi. Got plenty of questions if anyone has time. Thanks!