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This Package Includes the Following Items: 1 x Custom 12" 99-06 Chevy Silverado Extended Cab Sub Enclosure Box 1 x Kicker 43C124 12" Comp Series Sub 150W RMS 4 Ohm SVC Car Subwoofer 1 x Kicker CXA400.1 Car Audio CX Series Class D Subwoofer Amplifier 800 Watt Sub Amp 1 x Harmony Audio HA-AK8 Car 8 Gauge Amp Kit Custom 12" 99-06 Chevy Silverado Extended Cab Sub Enclosure Box: Single 12" Chevy 99-06 Extended Cab Sub Box Air Space: 0.90 Cubic Feet Mounting Depth: 6" Sealed Enclosure Dimensions: Width 23-1/2" x Front Height 9-1/2" x Rear Height 7" x Depth 13-1/2" Constructed with High Quality MDF Enclosure installs on passenger side under rear bench seat down firing This box fits: 1999 - 2006 Chevy Silverado Extended Cab 1500, 2500, & 3500 1999 - 2006 GMC Sierra Extended Cab 1500, 2500, & 3500 Kicker 43C124 12" Comp Series Sub 150W RMS 4 Ohm SVC Car Subwoofer: Size: 12" Impedance: 4 Ohms SVC Power Watts: 300W Peak / 150W RMS Sensitivity: 88.3 dB Freq. Response: 27-500 Hz Mounting Depth: 5-7/8" Mounting Diameter: 11" Kicker CXA400.1 Car Audio CX Series Class D Subwoofer Amplifier 800 Watt Sub Amp: RMS Power Rating: 4 ohms: 200 watts x 1 chan. 2 ohms: 400 watts x 1 chan. Max power output: 800 watts x 1 chan. Variable Bass Boost (0 to +12 dB bass boost at 40 Hz) Variable low-pass filter (50-200 Hz, 12 dB/octave) Subsonic filter (24 dB at 25 Hz) Frequency response: 25-200 Hz Dimensions: 7-3/16"W x 8-1/8"D x 2-3/8"H Harmony Audio HA-AK8 Car 8 Gauge Amp Kit: