DS18 G1800.4D 4-Channel Car Amplifier. 4 x 150W RMS @ 4Ω or 4 x 230W @ 2Ω; bridged 430W. Class D, LPF/HPF, high-level input. Compact heatsink, matte black. Protective: short, thermal, voltage. Great for subs and full-range speakers. New.
eBay