Alpine KTP-445U 4-Channel Universal Power Pack Amplifier

Model Number: KTP-445U
UPC: 793276011916
Model Number: KTP-445U
UPC: 793276011916

Alpine KTP-445U 4-Channel Universal Power Pack

  • Compact size
  • For aftermarket and factory installed systems
  • 90 Watts x 2 @ 4″ Bridged
  • 45 Watts x 4 @ 4″/2″
  • Best Signal-to-Noise Contender In Its Class


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Product Description

Features & Specifications




Alpine KTP-445U 4-Channel Universal Power Pack

Compact size lets Alpine KTP-445U fit where most amplifiers won’t. The KTP-445U comes equipped with the RCA and Auto-Sensing-Speaker level connectors and it fits behind the head unit in the dash of most vehicles. It’s small and compact at only 7-7/16” x 1-1/2” x 2-1/2”. The size and flexible wires make the Alpine KTP-445U Power Pack an easy choice to save space. You can install this compact amp behind most dashboards, but you’ll need 4-channel patch cables to connect your car stereo to the amp’s preamp inputs. You can also splice into your speaker wiring to get signal to the KTP-445U.

More power, less hassle

Want a simple way to crank up the power of your receiver? Alpine’s KTP-445U amplifier increases your receiver’s power output to 45 watts RMS by 4 channels. That’s a big jump up from the 7-20 watts per channel typically put out by a car radio, and plenty of power to drive high-performance speakers or keep up with a big subwoofer amplifier. Best of all, this compact amplifier is so efficient you can often run it off the same circuit that powers your receiver. A universal plug lets you feed a signal via RCA outputs or speaker-level wiring.

Independent Filters For Rear and Front Inputs

High-Pass selectable switches for Front & Rear allow frequency filtering for a wide variety of speakers. Choose from full range to selectable range: 60Hz, 80Hz or 120Hz to fine-tune your crossover points.

Configurable Inputs

>Need configurable options for Speaker-Level or RCA inputs to the Power Pack? 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. Selectable 2 Channel and 4 Channel options give you the control to determine source inputs, and can eliminate the need for Y-adapters.

Accessible Front and Rear Gains

The KTP-445U Power Pack provides simple variable gain controls on the end panel for flexibility and a wide variety of system applications.

Best Signal-to-Noise Contender in it’s Class

In order to ensure that Alpine sound quality is heard at your ears, we’ve created a platform that offers an unbelievably low noise floor, taking extra care to ensure a clean signal path, with no extraneous interference. The end result: The Power Pack boasts 1 Watt Signal-to-Noise Ratio of 82dB or better.

Total Harmonic Distortion (THD+N) vs. Frequency

Uniquely, the KTP-445U Power Pack 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.

Model KTP-445U
Model: KTP-445U
Product: Alpine KTP-445U 4-Channel Universal Power Pack Amplifier

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
Best Frequency Response 20-20k Hz
THD at Rated RMS Power 1%
Signal to Noise Ratio 82 dB
Input Voltage 14.4v


Amplifier Class D
High-Pass Crossover Frequency 60, 80, 120Hz
High-Pass Slope (dB/octave) 12 dB/oct
Bass Boost No
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

What's in the box

Alpine KTP-445U Power Pack owner's manual
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)
Limited Warranty card
"Thank You" letter

Mobile Amplifier Channels

Mobile Amplifier Class

Mobile Amplifier Features


Mobile Amplifier Fuse Rating

Mobile Amplifier RMS

Mobile Min Impedance

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Alpine One Year parts and labour warranty.