Hey guys. This is my first build, totally and 100% my design and setup. I've always had a system in my car, but I never built one, so I thought I'd give it a run. Everything is going great so far. But I just want to know how so set the amp for my subwoofer. I have a JL Audio 12W7-3, and a Hifonics BRZ1200.1d amplifier. Any help is appreciated. Also, is there any danger of running a direct power line to my head unit? It is an Alpine CDA-9805. Yea its old but I love the damn thing. And also, I know Hifonics is Wal-Mart, compared to JL in most people's opinion but I like it, and I've seen good things from it.
All help would be greatly appreciated, Thanks.