IMO the base 6 speaker system is great, but I play all music from my iPhone through an aux cord. I don't have an answer to your question about the panel but if you could provide details to your new speakers and amp that would be awesome!
'11 Laredo / Bright Silver Metallic / V6 / QT1 / 17" Wheels / Tow
3M 20% tint up front, GY Wrangler Silent Armors, 5000k LED interior and reverse lights
Audio: Pioneer AVH-X1500, Alpine MRX-M55, JL 12W3V3