Skar Audio SK-M4004D Compact Full-Range Class D 4 Channel Car Amplifier, 400W Ultra Compact MOSFET Full-Range 4-Channel Class D Car Amplifier RMS Power @ 2 Ohms: 140 Watts x 4 Channels (14.4v) RMS Power @ 4 Ohms: 100 Watts x 4 Channels (14.4v) Crossover Controls: HPF / Full-Range / LPF | Frequency Response: 10Hz - 40kHz Hi-Level Input Connections: Yes | 8 Gauge Power and Ground Input Terminals