This Package Includes the Following Items:
1 x Alpine S-A60M Car Audio Type S Series Amp Class D Sub 1200W Amp
1 x Harmony Audio HA-AK4 Complete 4 Gauge Amp Install Kit - Nickel
1 x Alpine S-W12D4 Type S Series Sub Dual 4 Ohm 1200W Peak 12" Subwoofer
1 x Compatible with 2014 - 2018 Chevy Silverado Crew Cab Truck Single 12" Sub Box Subwoofer Enclosure
Alpine S-A60M Car Audio Type S Series Amp Class D Sub 1200W Amp:
Power Output:400W RMS x 1 (4ohm)
600W RMS x 1 (2ohm)

S/N ratio: >85dB (ref: 1W into 4 ohm), >105dB (ref: rated power into 4 ohm)
Frequency Response: 10HZ-400Hz (+/- 3 dB)
Alpine S-W12D4 Type S Series Sub Dual 4 Ohm 1200W Peak 12" Subwoofer:
12" 4 Ohm Type-S Series Subwoofer
Power Handling:Peak: 1800 watts
RMS: 600 watts

Frequency Response: 26- 200Hz
Compatible with 2014 - 2018 Chevy Silverado Crew Cab Truck Single 12" Sub Box Subwoofer Enclosure:
Mounting Depth: 6-1/2"
Air Space: 0.74 Cubic Feet
Sealed Enclosure
High Quality Black Carpet
Overall Dimensions: 24-3/4" L X 16-1/2" W X 9-3/4" H
Enclosure installs under the rear seat, subs fire downward
This box fits:
2014 - 2018 Chevy Silverado Crew Cab Truck