The Massive Audio “Rail CAP E” was designed for all Nano EDGE high performance Amplifiers. With Massive Audio’s “Direct Plug & Perform” technology this powerful 4 Farad Capacitor with back lit Massive logo simply plugs directly into a dedicated docking port found on the end cap of the EDGE amplifier. The Rail CAP E is then automatically connected directly to the amplifiers internal power supply. When needed on demand (within milliseconds) the Rail CAP E will charge & discharge lighting fast power that will help stabilize the amplifiers power supply improve overall performance.