4 Channel

Alpine X-A70F X Series 4/3/2 Channel Power Density Amplifier
Stinger SPX700X4
Alpine KTP-445U
AudioControl LC-4.800
AudioControl D-4.800 DSP 4 Channel Amplifier
Focal AP-4340
Alpine KTA-30FW
AudioControl ACM-4.300
Alpine R-A60F 
Alpine S-A32F S-SERIES 4 Channel Amplifier
Kicker KXMA400.4
FOCAL FDS 4.350
Alpine KTA-450