RAILCAP P - PRIMO SERIES Capacitor 4 Farad Molex Lightning CapacitorThe Massive Audio Rail CAP P or "RCP" was designed for the high powered the PRIMO SERIES Amplifiers. With Massive Audio's " Direct Plug & Perform" technology this powerful 4 Farad Capacitor simply plugs directly into a dedicated docking port found on the end cap of the PRIMO SERIES. The Rail CAP P is then automatically connected directly to the amplifiers internal power supply. When needed on demand (within milliseconds) the Rail CAP P will charge &