I have an amp from Monacor Carpower (HPB 1002). Brings about 300 watts of RMS and a sub from Rockford Fosegate Punsh Z 3410 with 150 watts of RMS power. The amp runs to about 70% of its power! The manufacturer recommends to switch a 0.5 Farad Powercap! Is that necessary? Does that even bring something (better sound, release of Lima) in this performance class? Which cap is recommended? 0.5F or better equal to 1F?