I started this project a couple weeks ago but have been fine tuning before I posted. I installed the Kenwood DDX 396 (with the Maestro RR) and was happy with the install but after doing it relatively inexpensively in 2018, I decided it was time to upgrade a few things. I replaced my 4 Hertz DCX 165.3's with the Infinity REF 9632ix's in all four doors. I kept my Infinity Perfect 300M's in the dash as well as my under seat Kenwood KSC-SW11 powered subwoofer. I was using a Pioneer GM-D1004 (45W/channel) amplifier. With new speakers, I figured it was time for more power so I swapped the Pioneer with the Soundstream RSM4.1200D. The new components gave a lot more adjustability in the output and the power is just, WOW! Yes, I can make my little Jeep shake if I want but hearing things in a music track not heard before, is most impressive. I've not used Soundstream before but so far I'm impressed. More power but also a clean signal. The total footprint of this amp is basically the same as the Pioneer so it's easy to hide.The 6x9 Infinity speakers also add another dimension. I've included pics of the equipment used (sorry not much to see on the interior as everything is hidden).