Alpine MRP-F300 - 4 channel - build in crossover, gain, high and low-pass filters. Tested, in good working condition, small scratches. 4-Channel - 75W RMS x 4 (2Ω, 14.4V, ≤1% THD+N) - 50W RMS x 4 (4Ω, 14.4V, ≤1% THD+N) 3-Channel - 150W RMS x 1 bridged output at 4Ω + 75W RMS x 2 (2Ω) 2-Channel - 150W RMS x2 bridged output at 4Ω