So I’m super new to car audio and want to upgrade my 2009 Toyota Corolla s. I figured out my car has the 8 channel speaker trim package so it has 4 door speakers (I think they a woofers) 2 tweeters and 2 more speakers behind the back seats (idk if what they are). I think that means I need an 8 channel head unit but I don’t think those even exist. I don’t know what I should even be looking for to power all 8 of the speakers. Eventually I want to upgrade the speakers themselves but for now all I can really afford is a new head unit but I don’t even know if that’s what I need. If someone could please be so nice and tell me what I should be looking for or where I can find the information that will teach me what to do that would be awesome. Thanks for reading and I’m sorry if I posted this in the wrong spot or if this a dumb question.