I have a Formula 350CBR with 16 JL Audio M6 speakers and a 10 inch JL Audio sub, an M600 amp and an M400 amp with an PMX3 Rockford Fosgate Head unit. The sound is clear but feel tinny. I was thinking of adding a monoblock amp for the sub. Is that a good idea? Any other suggestions? I am new to this stuff. I never realized how much there was to it.