Features & specs
| Performance | ||
|---|---|---|
| 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 | |
| Power at 1 Ohm (Watts x Channels) | --- | |
| Bridged Power (Watts x Channels) | 90 x 2 | |
| Minimum Impedance Bridged | 4 | |
| Minimum Impedance Unbridged | 2 | |
| Minimum Impedance | 2 | |
| Best Frequency Response | 20-20k Hz | |
| THD at Rated RMS Power | 1% | |
| Signal to Noise Ratio | 82 dB | |
| Input Voltage | 14.4v | |
| Features | ||
| 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 | |
| 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 | |
Product Research
Features
Universal Head Unit Power Pack: The Alpine KTP-445U Head Unit Power Pack is a power upgrade amplifier that allows you to add higher output and more dynamic response to your aftermarket or factory installed car stereo system (without factory amplifiers). The KTP-445U amplifies your aftermarket or factory head unit's power output, resulting in increased power over the original head unit's built-in amplifier. It's small and compact at only 7.875" (w) x 1.5" (h) x 2.5625" (d) and fits behind the head unit in the dash of most vehicles. The KTP-445U comes equipped with RCA and auto-sensing speaker level inputs.
- If the fuse protecting the OEM radio is less than 15 Amps, you should run a separate +12V constant power wire from the battery to the higher-powered Alpine KTP-445U.
- This Alpine high-powered amp won't work in systems where an outboard factory amplifier is still active. If used in vehicles with a factory amplifier, the factory amp will need to be completely bypassed (this may result in lost speaker channels, if factory amp has more than 4 channels).
- The increase in power may result in a louder warning chime in certain vehicles.
45 Watt x 4 Channel Amplifier: The Alpine KTP-445U Head Unit Power Pack employs a 45 watt x 4 channel amplifier. The amplifier offers an unbelievably low noise floor, taking extra care to ensure a clean signal path, with no extraneous interference. The end result is a 1 Watt Signal-to-Noise Ratio of 82dB or better. Uniquely, the amplifier distortion actually decreases at higher frequencies, resulting in a clean and clear signal where your ear is most sensitive to distortion (< 0.03% THD+N @ 1W; 1% THD+N @ rated power).
CEA-2006 Compliant: The specifications given by Alpine for the built-in amplifier comply with the CEA-2006 mobile amplifier power testing and measurement standards from the CEA (Consumer Electronics Association). All manufacturers who comply with the standard can display the CEA-2006 logo on their product.
- CEA-2006 Power Rating: 45 watts x 4 channels (at 4/2-ohms, 20-20kHz, 1% THD)
- Bridged: 90 watts x 2 channels (4-ohm minimum impedance)
- Max Power Output: 90 watts x 4 channels (Peak)
Controls: The Alpine KTP-445U Head Unit Power Pack provides independent controls for the Front & Rear inputs.
- Front & Rear Gains: The Power Pack provides simple variable gain controls (speaker level: 0.5-10V, low-level: 0.2-4V) for flexibility and a wide variety of system applications.
- Front & Rear HPF: High-Pass selectable switches for the amplifier's Front & Rear inputs allow frequency filtering for a wide variety of speakers. Choose "Full-Range" or a selectable range (60Hz, 80Hz, 120Hz) to fine-tune your crossover points (-12dB/oct.).
- Configurable Inputs: On the bottom panel of the Power Pack there are selectable input options to accommodate Speaker-Level (0.5V-10V) or RCA (0.2V-4V) inputs.
- 4Ch/2Ch Modes: Selectable 2-Channel & 4-Channel options give you the control to determine source inputs, and can eliminate the need for Y-adapters.
Low-Level & Speaker Level Inputs: The Alpine KTP-445U Head Unit Power Pack includes a 5.5" low-level/speaker-level input harness. The harness features a proprietary 10-pin connector on one end that plugs into the KTP-445U and two pair of stereo RCA inputs that connect to your source unit's front & rear RCA outputs using a pair of stereo RCA cables (sold separately). If your source unit is not equipped with RCA outputs and only features speaker-level outputs, then you can cut off the included low-level/speaker-level input harness' RCA connectors (or use the optional Speaker Wire to RCA Adapters) and connect the KTP-445U to your source unit's front & rear speaker outputs.
Power/Speaker Output Harness: The Alpine KTP-445U's power/speaker output harness consists of a 16-pin proprietary connector on one end that plugs into the KTP-445U, and bare wires on the other end to connect to power/ground and your car stereo speakers through your vehicle's factory or aftermarket head unit's wiring harness. (What looks like a fuse holder in-line with the amp's power wire is actually a noise filter.)
Mounting: The Alpine KTP-445U Head Unit Power Pack includes cable ties to attach the amplifier to your vehicle's frame or chassis. The KTP-445U also includes two mounting brackets and four hex-head screws to fasten the amplifier to a flat surface of your vehicle.
