Stop the hum in your car speakers and subwoofers! Xitel"s Ground Loop Isolator - Auto (Clamshell) stops the annoying speaker hum that occurs when car audio components are connected together. Speaker hum is most commonly caused by ground loops in the electrical wiring. When one audio component is connected to another, a path is provided for current to flow, causing hum. Xitel"s Ground Loop Isolator breaks the electrical ground between car audio products so there"s no path for current to flow. Unlike cheaper solutions, Xitel"s unique design stops speaker hum without cutting any of the low bass frequencies required for optimum subwoofer performance! Works with all components - from simple stereo receivers to complex A/V receivers, equalizers, signal processors and game consoles. Can be used in multiple amplifier installations. Built from premium materials, Xitel"s Ground Loop Isolator maintains maximum audio fidelity for the highest possible performance. With a proven history in large commercial installations and the preferred solution for companies such as Kodak, Xitel"s Ground Loop Isolator is now available for the general consumer electronics market. Features: Stops speaker hum caused by imbalances in car electrical systems. Protects expensive audio equipment by breaking the earth between components Fully designed, built and tested to exacting standards for high fidelity applications. Does not effect sound quality. Totally preserves full bass signal for optimum subwoofer performance. Manufactured from high quality materials including captured RCA cable with gold plated connectors and gold plated RCA output terminals. Easy to install. Includes: Ground Loop Isolator User Manual Compatibility: All audio equipment with RCA outputs