I am running a kicker 2500.1 on a custom built Fi btl 18 in a box built to Fi specs. I have a xs power 3100 as my second battery. When I first hooked everything up my amp gain was maybe 1/4 of the way up and it sounded great. Now it's like the amp is losing power I had to turn the gain up more...
I got a bigger alternator from the audio shop and I have 4 red top optima batteries just dont have a amp to push them like I want... I was going to use my zx2500.1 on them til I can get a great amp....