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The Alpine KTA-450 4-Channel Power Pack Amplifier delivers 45W RMS x 4 at both 2 and 4 ohms, bringing powerful, clean sound to your system in an ultra-compact design that measures just 7" x 3.5" x 1.25". Featuring Alpine’s advanced Class D circuitry with Dynamic Peak Power (DPP) technology, the KTA-450 doubles its output during dynamic musical passages for impactful, distortion-free audio. Thanks to its efficient power requirements, this amp doesn’t need an additional power supply wire to the battery, making installation simple while ensuring your music plays loud and clear without clipping.