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.
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.
The number of "ways" doesn't really matter as much as the overall sound quality of the speaker. There are so many different car speaker designs it's ridiculous. I've had quite a few different kinds of 3 ways, 4 ways etc- but the higher quality 2 way speakers will totally blow away the cheaper speakers with tons of drivers in them. Trust me. Go listen and compare yourself. The JL TR series speakers will sound WAY better than anything from Pioneer, regardless of how many drivers are sitting in the baskets.
I would also do the same with the y splitters. Coaxials, triaxials are nice, you don't have to really adjust them, and they weigh less (if you are looking for speed in your car). The component speakers are usually the best, and offer the greatest flexibility with adjustment, but weigh and cost more. They usually come with at least a midrange, tweeter and crossover. 