I owned a 1st gen and currently own 2nd, non tech.
In first gen, I upgraded front door speakers and tweeters with an infinity component system (crossovers not needed) and that was a definite improvement.
2nd gen non tech does not have rear door speakers but with the tech package/ELS System you do. Highs seemed marginally better since the tweeters in the second gen are in the sail panels vs being in the dash.
Radio interference- do you have any aftermarket LED’s installed in your exterior lights? I installed license plate LEDs and they were fine. But I changed to LED brake/tail and they cause radio interference. Especially when braking. Something to do with the resistors inside the lamps.. went back to stock brake lamps and the static disappeared.