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Alpine PSU-300CVC

Powered System Upgrade for select 2016-up Honda Civic 4-door without factory premium sound

Item # 500PSU3CVC

The top two complaints about the way a car's factory system sounds are that there's not enough volume and...

Find what Fits your vehicle

The top two complaints about the way a car's factory system sounds are that there's not enough volume and...

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Discontinued item
4 questions - 3 answers

Item # 500PSU3CVC

Since 1974

Years of experience making people happy.

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Installation help for your car, from our experts.

About the Alpine PSU-300CVC

Buck Pomerantz

Fix your factory sound

The top two complaints about the way a car's factory system sounds are that there's not enough volume and there's not enough bass. Alpine's PSU-300CVC Powered System Upgrade solves both of these issues in your Honda Civic with a neat and clever combination of products designed to bring joy to all music lovers.

Fix your factory sound

The top two complaints about the way a car's factory system sounds are that there's not enough volume and there's not enough bass. Alpine's PSU-300CVC Powered System Upgrade solves both of these issues in your Honda Civic with a neat and clever combination of products designed to bring joy to all music lovers.

The components

The package includes a compact 4-channel amplifier and a powered subwoofer, both mounted in a Civic-specific bracket which mounts under the passenger seat and wired up using Honda-specific harnesses. The PSU-300CVC upgrade is compatible with the factory Honda base radio and almost all other aftermarket receivers. Alpine says you should be able to install this upgrade in your car in two hours or less.

Universal power pack

Alpine's KTP-445U Power Pack amplifier increases your radio's power output to 45 watts RMS by 4 channels, considerably more than what's put out by the Honda radio. A universal plug lets you feed a signal via RCA outputs or speaker-level wiring. A built-in high-pass filter optimizes the sound for your speakers.

Compact powered subwoofer

Alpine's PWE-S8 powered sub uses a Class D amplifier rated at 120 watts RMS to drive the 8" shallow-mount, high-excursion subwoofer, so there's plenty of power for your bass. The amp features controls for phase, gain, and a low-pass crossover, so you'll be able to blend the bass with the rest of your system.  A wired remote control lets you adjust the bass level from the driver's seat. 

Important Note: This upgrade package won't work with Civics with the factory premium amplified system or with the Touring models.


Product highlights:

  • factory audio system upgrade
  • fits select 2016-up Honda Civic 4-door without factory premium sound
  • Alpine KTP-445U Power Pack 4-channel amplifier
    • 45 watts RMS x 4 at 2 or 4 ohms
  • Alpine PWE-S8 compact powered subwoofer
    • 8" woofer
    • 120 watts RMS amplifier
  • vehicle-specific bracket holds sub and amp under front passenger seat
  • vehicle-specific wiring pre-cut and terminated
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # PSU-300CVC

What's in the box:

  • PWE-S8 Powered sub and attached KTP-445U 4-ch amplifier w/ integrated brackets
  • 7' Main harness
  • 12' Loomed power cable (inline 20A fuse)
  • 9" T-harness
  • Four 10" speaker-RCA harnesses
  • Remote bass knob w/ 16' cord
  • 2.5" Strip of hook-and-loop fastener
  • Ten 6" wire-ties
  • One 1/2" self-tapping pan-head screw
  • 1 Star-washer
  • Installation guide
  • Warranty sheet
  • Alpine Technical Support contact sheet

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More details on the Alpine PSU-300CVC

Pat M.

Product Research


Overview: Alpine's PSU-3CVC is a dedicated 300 watt sound system designed specifically for 2016 - Up Honda Civic 4-Door LX, EX, EX-T, and EX-L models (excludes Touring models) not equipped with a factory premium amplified sound system. The system includes a KTP-445U 4 x 45 watt amplifier, a PWE-S8 8" powered subwoofer, and all the wiring needed, pre-loomed and ready to install. The PSU-3CVC also includes a remote bass knob for changing the bass level from the dash.

Wiring: The PSU-3CVC system can be interfaced with a factory radio (non-amplified) or an aftermarket radio. The included T-harness interfaces the factory wiring in the dash, providing either a speaker-level signal from a factory radio or an RCA line-level signal from an aftermarket radio, to feed to the Alpine KTP-445U amplifier. The T-harness also feeds the amplified return signal back into the factory wiring and out to each of the speakers, utilizing the factory speaker wires. The provided wiring includes a 10 ga. power wire, with inline fuse holder, that gets run to the battery, providing power for both the 4-channel amp and the PWE-S8 subwoofer.

Mounting: Alpine provides pre-attached brackets that are designed specifically to mount both the KTP-445U amp and the PWE-S8 subwoofer underneath the passenger front seat. This means no usable space in the vehicle is taken up by the sound system.

KTP-445U: 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 Power Pack employs a 45 watt x 4 channel amplifier with 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). 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.

PWE-S8: The Alpine PWE-S8 is a compact self-amplified subwoofer with pre-installed brackets that allow it to fit underneath the passenger's front seat, keeping it out of sight. The PWE-S8 includes a built-in 120 watt Class D amp along with an 8" high-excursion subwoofer. It can accept either line- or speaker-level inputs and features an Auto Turn-on circuit that will activate the amp when it senses a signal on the speaker-level inputs. An included wired remote lets you easily adjust the bass level from the front seating area. The control can be mounted under a dash panel and gives you a level range from 0 to -20 dB, relative to the gain setting on the amplifier. Controls on the subwoofer include:

  • Gain: Can vary the input level from 0.2 - 4.0 volts line-level and 0.5 - 10 volts speaker-level.
  • Low Pass Filter: Rotary control that can set the filter cutoff between 50 - 150 Hz.
  • Phase: Switches between 0˚ and 180˚.
  • Power Mode: Switches between SP IN (speaker-level input) and REM (wired remote input).

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Customer Q&A

4 questions already asked

Will this work on a civic hatchback?
[ Jacob  Mar 18, 2021 ]
1 answer
I installed mine in a sedan, but since it goes under the front passenger seat, it should fit, as I think the front seats are the same between the two. I did have to file the bracket a little, as I couldn't get the bolts to align. This was the right rear mounting hole, I think. Very important! You must have the base-model stereo with the separate climate (A/C) controls. This won't work with the touchscreen radios!
[ Glenn  Mar 18, 2021 ]
I have a 2019 Highlander XLE, does the Alpine Psu-300cvc work with it ?
[ Manuel  Aug 10, 2019 ]
1 answer
This factory system upgrade is not compatible with your Highlander. However, if your Highlander came without a factory installed amp, you can use the PWD-X5 to upgrade the system. Here it is:
[ JASON  Aug 19, 2019 ]  Staff
I've never installed any audio equipment before. Everything is included in the box? So, all you have to do is install? No splicing of wires, adding wires, etc.? (I have a 2019 Civic EX-L sedan without the premium system).
[ Peter  Feb 28, 2019 ]
1 answer
Everything is in the box. And there is no need to splice into the stock wiring. But there are wires that must be added and ran to the radio location from where this is mounted. Also, there is a power wire included that must be ran to the battery My Bio:
[ JASON  Mar 06, 2019 ]  Staff

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