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High performance 4 channel car amplifier Series of high-performance mono, 4 and 5 channel Features car amplifiers. Compact size High and low level input Infinity's Reference 3004A amplifier will add plenty of muscle to your music without Variable crossover breaking a sweat, and it'll look good doing it. This 4-channel powerhouse delivers 75 watts RMS to each of the front and rear speakers in your car.