No ported box, sealed. Heres the problem. Taking a look at the subs today and trying to see if it needed tuning. Tweaked some settings on both amps for both sets of subs. After i tweaked with the amp for the 15's i could not get them back to not popping/cutting out constantly. I had my lights on my car as well, if this is important i don't know. When the 15's were on for a short time they sounded horrible. I disconnected the amp for the 12's and just had the 15's on at one time. They would be bumping in the back but when I sat in the car it was almost inaudible. I couldn't hear or feel much of anything. I then decided to just have the 12's on and when I just had them on they seemed to be 90 percent of the system. This meaning they were what I was really feeling all the time, the 15's would pick up the lows but the 12's got everything else.
Here is what i'm thinking. Either a, my 15's are blown, b, my amp has turned worn and [censored] and can no longer power both sets of subs and headlight, c, both of these. Can someone reasure this for me. I don't wanna go out and spend money on new 15's if the same problem is going to happen again because of my alternator. TIA.