I have a 2020 Subaru Ascent Premium with the standard radio. I've already replaced the front door speakers/dash tweeters with Kicker KSS269 KS Series 6"x9" 2-way components and the rear doors with Kicker 51KSC6504 KS Series 6-1/2" 2-ways, both 100W RMS @ 4ohm. I currently have an amp installed...