Ok, stupid question here... I finally got around to putting my subs into my C3. They aren't hooked up to the stereo yet, but I used a portable MP3 player and RCA cable to test them (used trucks power and grounds). At low volume they are fine, but once I start to give it some juice, they seem to buzz, or reverb a bit. I am running 2 12" PPI subs and a P2200 PPI amp bridged. I ran the same setup in my car with no issues. The only things that have changed are 1) I added a 1farad cap to the power source 2) I quickly threw together the sub boxes (new homemade boxes to fit the C3). I know the boxes have some small gaps in some of the workmanship. Could these gaps be letting out too much air causing this buzzing? The gaps are large enough to easily feel airflow from many seems. The subs are designed to work in a sealed box best.