Alright, so to start I've got 2 12" Rockford Fosgate Subs being powered by an 1100 watt Quantum QXA1100m installed in my 2012 Honda Civic. Recently I've been experiencing a BIG problem with them and the speakers in general.
The Problem: It's as if all the volume in my car has been cut in half. I used to turn it up to 20 and it would hit very hard and the speakers were fairly loud, now it's like I only have it turned up to 10 or 20. I'm using the stock headunit and have a hi-low adapter on the speakers. Bottom line is that the subs aren't hitting near as hard as they were just days before and its not like they just blew out in the middle of a song, I went out and started my car and had very weak bass.
What I've Tried: I have checked the ground, which is solid and down on bare metal. I have made sure that all wires a secured on the amp in the correct location. I've checked RCA cables as well. Checked all fuses.
Temporary Success: I was able to get the subs and volume back to how they used to be, but it eventually slipped back into being very weak. All I did to fix the problem was move the RCA cables from the bottom two inputs on the amp to the top two, but it didn't fix the problem long, as it is back to being messed up
Does anyone have any idea of what might be causing this to happen? One second the bass was fine the next its very weak. I've had the system for almost a year now and it's worked flawlessly up until now, any reply is much appreciated.