Alpine MRP-F300 V-Power Series 4-channel car amplifier — 50 watts RMS x 4 at Crutchfield
Alpine KTA-450 4-Channel Power Pack Head-Unit Amp
Alpine R2-A60F R-Series 4-Channel Amplifier - 150W x 4 at 2-Ohm, Hi-Res Certified - Creative Audio
Amazon.com: Alpine MRV-F300 4-Channel Car Amplifier, 50 Watts RMS x 4 : Electronics
Alpine R-A60F R-Series 4-channel car amplifier — 100 watts RMS x 4 at Crutchfield
Amazon.com: Alpine S-A32F S Series 4 Channel Digital Amplifier 80 Watts RMS x 4, 2 Ohms and RUX-KNOB.2 Driver's Seat Bass Gain Remote Controller Bundle : Electronics
Alpine S-A32F 4-Channel Car Amplifier, 50 Watts RMS x 4 – absoluteusa
Alpine S-A32F S-Series 4-channel car amplifier — 55 watts RMS x 4 – Audio Design