Capacitors are mandatory for audio systems with amplified power that requires more signal than altenator can provide. This frequently occurs when music peaks & heavy bass notes hits. During these peaks, the Voltage/Current demand on the system is increased and can cause severe voltage drops. IF your lights are dimming this stiffing Cap is needed. Capacitors act as a power reservoir, supplying added power to keep your system playing strong. Hear and feel the bass your missing