amplifier

I've got an Eonon R51 headunit which I like a lot, however I'd like to amplify the door speakers with more power. The back of my headunit: Given the above, I know I can safely get RCA inputs out of the headunit and run some normal RCA cables to an amplifier, however it's the speaker wiring...

I recently got a set of kicker CSS68 and CSC68 speakers to replace my crappy Bose door speakers in my 09 Mazdaspeed3 GT, plus some Pioneer TS-G520s for under the front seats. Along with those, I picked up a Kicker 46HS10 Hideaway Subwoofer with a 180-watt amp built in for the trunk. It comes...

I recently did a few things to my car. This post will be full of pics and if you have questions let me know. I will post all the parts with links. I did not measure the DB before I did all this but I can say it made a very noticeable difference windows up and just cruising, the car feels more...