KTP-445U

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:
  • <0.03% THD+N @ 1W
• High-Pass Filter Options:
  • Full Range
  • 60Hz
  • 80Hz
  • 120Hz
• Input Sensitivity:
  • RCA: 0.2V – 4V
  • Speaker-Level: 0.5V – 10V
• Dimensions:
  • 7-7/16” W
  • 1-1/2” H
  • 2-1/2” D
• Weight:
  • Approx. 3.3 lbs