Hi, I've just bought an XR6 Ute which has the standard audio and to my ears the sound is absolute garbage. So I understand that all 4 speakers are 5x7 so I am looking to upgrade at least the front 2 as that's what I will be listening to anyway, I'm not a huge bass fan so I don't really wish to add a sub. Will the standard head unit be able to handle a simple speaker upgrade? or will I need to install an amp? What options do I have for speakers? Any advise will be greatly appreciated.