Alright so here's the deal I did some searching and couldn't find exactly what I was looking for so I decided to go ahead and post. I don't really know how to word this so bare with me. When I have my system playing for the first 10 or so min its pounding like it should be but after that first 10 or so min the bass softens up its still hitting but just not as loud. I'm pretty knowledgable when it comes to car audio but i've never experienced this problem.
As far as my set up I have a 96 accord stock 90 amp alt, the biggest available battery for my car from Walmart (cant remember the name), and a Kinetik 2400 in the trunk, with all 0 gauge Knu Concept wiring, running a Hifonics BRZ1700.1. Could the cause be voltage drop? Any help would be appreciated thanks!