2014-2018 Chevy Silverado / GMC Sierra Double Cab — Harmony HA-R124 Single 12" Sub Box CXA400.1

Package includes: 1 x 2014-2018 Chevy Silverado Double Cab Truck Single 12" Sub Box Subwoofer Enclosure 1 x Harmony Audio HA-R124 Rhythm Series 12" Package Sub 1 x Kicker CX300.1 Car Audio CX Series Class D Subwoofer Amplifier 600 Watt Sub Amp - Limited Stock 1 x Harmony Audio HA-AK10 Car Stereo Complete 10 Gauge 600W Amp Amplifier Install Kit - Nickel Under-seat enclosure (fits 2014-2018 Chevy Silverado Double Cab truck): - Single 12" custom subwoofer enclosure designed to install beneath the rear seat with downward-firing drivers - Mounting Depth: 5-1/2" - Air Space: 0.55 Cubic Feet (sealed) - Construction: High Quality MDF with high quality black carpet finish - Terminal: High Quality twist knob / banana plug terminal cup (Bare Wire 'up to 10GA') - Overall Dimensions: 28-3/4" L x 14-3/4" x 9-3/4" H Harmony HA-R124 12" Rhythm Series subwoofer specifications: - Power Handling: Peak: 600 watts RMS: 300 watts - Sensitivity: 88.2dB - Frequency Response: 27Hz-1.8kHz - Mounting Depth: 5 11/16" - Mounting Cutout Diameter: 11 1/8" - Min Sealed Box Volume (Cubic Feet): 1.25 Max Sealed Box Volume (Cubic Feet): 3.52 - Min Vented Box Volume (Cubic Feet): 1.65 Max Vented Box Volume (Cubic Feet): 2.3 - Impedance: Single 4 Ohm Amplifier & installation kit: - Kicker CX300.1 CX Series Class D subwoofer amplifier — 600 Watt sub amp (limited stock) - Harmony HA-AK10 complete 10 gauge amp install kit (600W capacity) in nickel finish This bundle supplies a vehicle-specific sealed under-seat enclosure, a 12" Harmony subwoofer, a powerful class D Kicker sub amp, and a full 10GA installation kit — everything needed for a clean, factory-friendly bass upgrade in the 2014-2018 Chevy Silverado Double Cab (also compatible with GMC Sierra Double Cab configurations listed).