This is probably because the 5" head unit didn't provide enough quality power. I have the 8" and in think about adding an amp to properly power my doors which has jl audio c2. I just ordered some kenwood 3.5s for the dash.Interesting observations, I may be one of the few people who have upgraded the 5" uconnect to the 8.4 (infotainment).
Only mods were the 2 kickers in the dash corners. I previously had my 5" equalizer set to almost maximum negative treble and backwards 2 clicks. It sounded ok but was getting some mild popping/cracking from the corners and generally sounded muddy when turned louder.
Upgraded to the 8.4 stereo...NIGHT AND DAY difference. Equalizer set to 0 (except bass turned up). Probably 25-40% clearer than the 5" radio, no more popping or crackling sounds through the audio. I know not many people have the 5", but if you do apparently the 8.4 outputs a vastly superior/clearer signal.
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