1.) I have decided to run four speakers with a 4 channel amp, and one sub with a bridged 2 channel amp. My headunit only has two RCA outputs though--one for the front speakers and one for the rear speakers. So, from what I understand I will need to run the 4 channel amp using the front RCA output, and the 2 channel amp using the rear RCA output. So, that means I will need a 4 channel amp with a variable channel input selector, or as they sometimes write it: A, A/B input. Is this a normal thing for amps to have? Because most don't even mention it. 2.) In this setup with 4 speakers and a sub, is it better to buy full range speakers, or tweeters? I need to choose between tweeters, 2 ways, 3 ways, 4 ways, 5 ways.... Celesta mentioned the JL Audio TL series speakers, which are 3 ways. I am also thinking about Pioneer 4 ways, or the Pioneer REV series, which are 2 ways.