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Harrison Labs FMODs are high-performance, passive electronic crossovers engineered and meticulously manufactured in the U.S.A. Available in both High Pass (Red Label) and Low Pass (Black Label)configurations. These "active simulators" function as inline RCA filters that provide the precision of an electronic crossover without the need for power, grounding, or remote wires. By processing the signal at the pre-amp level before it reaches the amplifier, they eliminate the noise, distortion, and "turn-on thumps" often associated with active equipment, all while utilizing your choice of premium gold or nickel plated brass connectors to ensure a laboratory-grade signal path.