1988-1998 GMC Sierra / 88-98 Chevy CK Ext Cab Custom 10" Sub Box with Harmony HA-R104 10" Sub & Kicker CX300.1 Amp

Complete fitment package for 1988–1998 Chevy/GMC Extended Cab trucks. This kit pairs a custom, sealed down‑firing 10" enclosure made to install on the driver side under the rear seat with a Harmony Audio Rhythm Series 10" subwoofer, a Kicker CXSeries Class D sub amp, and a Harmony 10‑gauge amp wiring kit in nickel finish. Package contents: - 1 x Custom 10" 88-98 Chevy CK Extended Cab Subwoofer Box - 1 x Harmony Audio HA-R104 Rhythm Series 10" Single 4 Ohm Sub (500W peak / 250W RMS) - 1 x Kicker CX300.1 CXSeries Class D Subwoofer Amplifier (600W max) - 1 x Harmony Audio HA-AK10 Car 10 Gauge 600 Watt Amp Kit - Nickel Finish Custom 10" 88-98 Chevy CK Extended Cab Subwoofer Box - Configuration: Single 10" sealed enclosure - Air Space: 0.90 Cubic Feet - Mounting Depth: 6" - Sealed enclosure external dimensions: Width 23-3/4" x Front Height 10" x Rear Height 2" x Depth 13-1/4" - Orientation/fitting: Installs on driver side under rear seat, down‑firing Harmony Audio HA-R104 Rhythm Series 10" Subwoofer (Single 4 Ohm) - Power handling: Peak 500 watts / RMS 250 watts - Sensitivity: 86.1 dB - Frequency response: 30 Hz–1.5 kHz - Mounting depth: 5 5/16" - Mounting cutout diameter: 9 1/4" Kicker CX300.1 CXSeries Class D Subwoofer Amplifier - RMS power rating: 4 ohms: 150 watts x 1 channel; 2 ohms: 300 watts x 1 channel - Maximum power output: 600 watts x 1 channel - Variable low-pass filter: 50–200 Hz, 12 dB/octave - Subsonic filter: 24 dB at 25 Hz - Frequency response: 25–200 Hz Harmony HA-AK10 Amp Kit - 10 gauge wiring kit rated for 600 watts, nickel finish This complete set provides a compact, vehicle-specific enclosure and properly matched sub and amplification for robust bass in Extended Cab Chevy/GMC trucks while including the wiring kit needed for installation.