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The Harrison Labs FMOD is a pair of 150 Hz low-pass inline crossover simulators for RCA-type input amplifiers. Place an FMOD inline with the patch cable between the source, such as a head unit, and the amplifier.
Each FMOD features a 12 dB per octave crossover slope, 24kt gold over brass construction, and a 10 volts maximum RMS input. FMODs can be combined with other FMODs to obtain bandpass ranges, or with other types of crossovers to change the slope and crossover frequency point.