ALPINE PDX-4.100M 4-CHANNEL MARINE AMPLIFIER *CLASSIC*,Alpine PDX-4.100 4 Channel Power Amplifier 100 Watts RMS x 4,Alpine - PDX-4.100 4 / 3 / 2 Channel Power Density Digital Amplifier,Alpine PDX-4.100M 4 Channel Class D Marine Digital Amplifier,Alpine PDX-4.100 4-channel car amplifier 100 watts RMS x 4 at Crutchfield