I have to disagree with a speaker upgrade as the first step. The stock speakers are extremely efficient already and the 3+ sets that I tested with the stock head unit were substantially lower in overall volume and imperceptibly cleaner. Add more power and yes you’ll need to upgrade the speakers. Dallas, you have a Pioneer head unit, MTX amps, and Monster wiring in addition to different speakers.

I really think a sub of some sort is the FIRST place to start since there is NO true bass producers in the stock system. Then try the front speakers before you go to all the trouble of replacing the back speakers that are more fill speakers than anything else. I switch my sub in and out and you would swear the entire system has been upgraded and it’s only a 10”

Good luck and let us know what works for you.