Okay, I had 4 audiobahn in a sealed box a few days ago, I changed my set up and put 3 audiobahn in a ported box at 1 ohm, before the 4 audiobahn were at 3 ohms. The answer is probably obvious and I probably already know the answer...but ever since I put the ported box in, when my bass hits at like 4 dB and up, but lights will blink or dim down, even while driving. I have a suspicion I need to get another battery....I know it's not my alternator, for I had it tested 3 times, once on a shop machine. It's a 220 amp alternator. My electrical wiring consist of 0/1 gauge all around, my wiring is not lose, I already checked, I will look at my alt to see if I can add a 0gauge ground. I'm wondering if that's my problem... so if you guys/gals have any suggestions, I would like to hear them, Thank you for replying.