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What's Inside?
• Head Unit Power Pack
• 15-amp ATM mini-blade fuse (installed)
• 30" Power/speaker-output harness
• 5.5" Speaker-level/low-level input harness (Turn-on lead is 40" long)
• (2) Metal brackets
• (4) Phillips/Hex-head mounting screws
• (4) Wire-ties
• Owner's Manual (English/ French/ Spanish)
Power Pack Series Car Amplifier
With Alpine's Power Pack car amplifiers, you get a louder audio output compared to what built-in amplifiers from car receivers can offer you, and a great example of that is the KTP-445U. This compact amplifier can give you more power than you'd ever expect.
Class D Amplifier
Thanks to its Class-D amplifier design, the Alpine KTP-445U can deliver 45 Watts of RMS Power at 4 or 2 ohms and 90 Watts of continuous power output at 4 ohms when setting the amplifier on a bridge mode. It has a signal-to-noise ratio rate of 82 dB, which means that it has minimal noise when you use the amplifier at high volume levels.
Variable High-Pass Filter
It has a variable high-pass filter to filter out unwanted frequencies that can affect the quality of your audio output. Whether you set the Alpine KTP-445U at full-range or want to cut all frequencies below 60, 80, or 120 Hz, you get a more defined audio quality performance from the amplifier. You can also set it in a two or four-channel mode, depending on what your car's speaker system needs.
| Brand | Alpine |
| RMS Power Output (Watts x Channels) | 45 x 4 |
| Peak Power Output (Watts x Channels) | 90 x 4 |
| Power at 2 Ohms (Watts x Channels) | 45 x 4 |
| Bridged Power (Watts x Channels) | 90 x 2 |
| Minimum Impedance Bridged | 4 |
| Minimum Impedance Unbridged | 2 |
| Minimum Impedance | 2 |
| Amplifier Class | D |
| Low-Pass Crossover Frequency | N/A |
| Low-Pass Slope (dB/octave) | N/A |
| High-Pass Crossover Frequency | 60, 80, 120Hz |
| High-Pass Slope (dB/octave) | 12 dB/oct |
| Best Frequency Response | 20-20k Hz |
| THD at Rated RMS Power | 0.01 |
| Signal to Noise Ratio | 82 dB |
| Input Voltage | 14.4v |
| Bass Boost | No |
| Bass Boost Frequency | N/A |
| Fan Cooled | No |
| Fuse Rating | 15 |
| Speaker Level Inputs | Yes |
| Preamp Outputs | No |
| Width (inches) | 7 7/8" |
| Height (inches) | 1 1/2" |
| Depth (inches) | 2 9/16" |
| Parts Warranty | 1 Year |
| Labor Warranty | 1 Year |
