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The Harmony Audio HA-SPK-PACKAGE305-AMP is a comprehensive speaker and amplifier upgrade package designed to replace factory components in select vehicles. This kit provides a significant audio enhancement, featuring a Harmony Audio HA-A400.4 4-channel amplifier, a Harmony Audio HA-AK10 amplifier installation kit, and two types of Harmony Audio Rhythm Series speakers. The package includes a pair of 6.5" 2-way speakers with 300 watts peak power and 100 watts RMS, a frequency response of 40Hz-20kHz, and a sensitivity of 90dB. Additionally, it includes a pair of 6x9" 3-way speakers with 450 watts peak power and 150 watts RMS, a frequency response of 30Hz-20kHz, and a sensitivity of 92dB. The HA-A400.4 amplifier is a Class D full-range amplifier capable of delivering 75W RMS x 4 at 4 Ohm Stereo or 200W RMS x 2 when bridged, with a frequency response of 10Hz-30kHz and a signal-to-noise ratio of 95dB. The included installation kit provides 10-gauge power and speaker wire, RCA cables, a remote wire, fuse holder, and various terminals for a complete setup. The amplifier features selectable filters for front and rear channels (Full, High Pass, or Low Pass), adjustable gain, and bass boost. It is compatible with both aftermarket and factory sources, with a DC offset feature that can turn on another device when used. The application guide lists compatibility for Chevy Camaro (2010-2014), Chevy Silverado Truck (2014-2015), Chevy Suburban (2015), Chevy Tahoe (2015), and numerous Ford, Lincoln, and Mazda models.