| i will take stab at a few of them you normally use 1 channel per speaker 4 channel amps to power 2 front and 2 rear
or
2 channel amp to power 2 front and allow the h/u to power the rears (you may not need to send much power to the rears) you can use a 1 channel or 2 channel amp to power the sub. if using a 2 channel amp, you can bridge the connections which would provide more power than from a single channel.
bridging is using the + terminal from one channel and the - terminal from another channel to power a speaker. or you could consolidate it all and go with a 4.1 channel amp, 4 outputs for the front and rear speakers, and 1 output for the sub. subwoofers require much more power and can handle much more power than your front and rear speakers although it is not necessary, you might want to look into component speakers, which will separate tweeters and mids. tweeters are high frequency and are very directional, so components allow the smaller tweeters to be mounted separately from the larger mids (because they are smaller). with component systems, you have to find room to fit a small crossover amp as well. with a non component system, the tweeter sits above the mid, and you are left mounting it where the mid fits. i would suggest that you do not attempt to build your own box, as you have plenty more to do. so, i would suggest to buy a premade box to fit the z from chris, or find a used jl box. a box should be the least of your worries. building a ported box requires much more research and expertise. a sealed box is easier to build and you make it to match the volume specified by the subs requirements. finally, you need to research more about wire gauge and power. learn the difference between max power and rms power. learn the relationship between wire gauge and power. depending on your power requirements, you must select a specific gauge from there. you will need different sized wires going to the amps from the h/u, going from the amp to the speakers, power wires from the battery to the amps, and signal wires from the h/u to the amps.
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