I have a fi bl and a sundown 1500d and lately my sytstem hasnt been playing as loud as usual. it just dont have the edge it usually does. If i had to guess i would save ive lost a full 2 db. its not my voltage cause it stays right around 13.3 a lil wire came loose on my old rca's but i bought some new ones and it STILL sounds the same. What other reasons could be causing this not to play as loud?