The Alpine KTP-445U Universal Power Pack is one of the most popular compact amplifier upgrades in car audio, designed to dramatically improve the sound quality and output of factory or aftermarket head units without requiring a large traditional amplifier installation. Delivering up to 45 watts RMS x4, the KTP-445U provides up to a 150% power increase over standard radio power while fitting neatly behind the dash in most vehicles. Featuring both RCA and speaker-level inputs, adjustable gain controls, selectable high-pass filters, and ultra-compact dimensions, the KTP-445U is perfect for powering aftermarket door speakers, motorcycle audio systems, OEM+ upgrades, and stealth installs where space is limited. Features Ultra-compact 4-channel Class-D amplifier Works with factory or aftermarket radios Up to 150% power increase over factory radio output RCA & speaker-level inputs Auto-sensing speaker-level inputs Selectable 2-channel or 4-channel input modes Adjustable front & rear gain controls Selectable high-pass crossover filters Bridgeable channel operation Behind-the-dash installation capability Low noise floor & clean sound output Perfect for OEM+ sound upgrades Specifications RMS Power Output: 45W x 4 @ 4 Ohms 45W x 4 @ 2 Ohms 90W x 2 Bridged @ 4 Ohms Amplifier Class: Class-D Frequency Response: 15Hz – 50kHz Signal-to-Noise Ratio: 82dB or better Total Harmonic Distortion:
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