The infinity speakers are good - I have them as well. The stock speaker wire is more than adequate. I found that I needed to install a resistor to cut back the sound a bit for better imaging (as Cico7 stated), but they are not totally turned off. One reason is that these are 2 ohm speakers. I replaced the original system with an Alpine amp for the 6 speakers and a JL Audio amp for the subwoofer. Without the resistor, the deck speakers were just too bright. I still lack some mid bass and am not sure if its the natural resonance of the cabin or I am just not tuned up properly.
07 Jeep Commander 4.7L FFV 4X4, 4" Superlift, BFG 285/70/17 KM2's, 4xGuard Front / Belly / Side /Diff Guards, CAI / Catback, Jet Stage 1 Chip
03 BMW Z4 2.5i ESS Stage 1 Supercharged, Staggared Wheels, Koni/Dinan Suspension, Stebro Exhaust