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Alpine KTA-450 Power Pack

Compact 4-channel car amplifier — 50 watts RMS x 4

Item # 500KTA450

If adding more power makes music sound better, Alpine's KTA-450 power pack will make a significant improvement in...

If adding more power makes music sound better, Alpine's KTA-450 power pack will make a significant improvement in...

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$199.95

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About the Alpine KTA-450 Power Pack

Bump up the power

If adding more power makes music sound better, Alpine's KTA-450 power pack will make a significant improvement in your system. This compact 4-channel amplifier puts out 50 watts RMS per channel from a tiny chassis that'll fit almost anywhere in your vehicle. KTA-450 uses Alpine's Dynamic Peak Power (DPP) technology to deliver a quick energy boost when needed, virtually doubling the amplifier's output power on musical peaks.

Bump up the power

If adding more power makes music sound better, Alpine's KTA-450 power pack will make a significant improvement in your system. This compact 4-channel amplifier puts out 50 watts RMS per channel from a tiny chassis that'll fit almost anywhere in your vehicle. KTA-450 uses Alpine's Dynamic Peak Power (DPP) technology to deliver a quick energy boost when needed, virtually doubling the amplifier's output power on musical peaks.

Alpine Authorized Online Dealer

PowerStack Installation

Here's a very cool idea from Alpine — the package includes a PowerStack bracket for mounting the amp in your dash behind Alpine's shallow chassis iLX-W650 digital multimedia receiver. The combined depth of receiver and amp is still less than 5", so it'll fit in a wide variety of vehicles. The receiver and amp together make a feature-filled and powerful sound system that you'll enjoy for many miles.

Installation Notes: This power pack will not work in systems with a factory amplifier. Wiring and fuse are not included — 12-gauge power and ground wires and a 20A inline fuse at the battery are required.

Alpine KTA-450

PowerStack bracket with KTA-450

READ LESS

Product highlights:

  • 4-channel car amplifier
    • 50 watts RMS x 4 at 4 ohms (45 watts RMS x 4 at 2 ohms)
    • 100 watts RMS x 2 bridged at 4 ohms
  • CTA-2006 compliant
  • Dynamic Peak Power (DPP) technology adds a burst of power when needed
  • selectable high-pass filters (60, 80, 120 Hz at 12 dB/octave) on front and rear channels
  • preamp and speaker-level inputs
  • selectable 2- or 4-channel input
  • PowerStack bracket included for mounting amp behind Alpine iLX-W650 digital multimedia receiver (#500ILXW650)
  • wiring, hardware, and fuse not included with amplifier
    • 12-gauge power and ground leads and a 20A fuse recommended
  • dimensions: 7"W x 1-3/8"H x 3-9/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # KTA-450
KEEP READINGREAD LESS

What's in the box:

  • 4-Channel amplifier
  • 12" Input/Output/Power harness
  • 1 Head unit (iLX-W650) mounting bracket
  • 2 Universal mounting brackets
  • Four M5x6mm Allen head machine screws (3mm)
  • Two M2.6x8mm Machine screws
  • Four 3/8" Screws
  • Four 7" Zip Ties
  • Owner's Manual (English/ French/ Spanish)
  • Warranty information
  • On-line product registration information

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Alpine KTA-450 Power Pack reviews

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Alpine KTA-450 Power Pack

Crutchfield customer from Naper, NE on 8/11/2019

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Great amp. Great sound.

Pros:

Cons:

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Solid fits well

Crutchfield customer from Winder, GA on 7/29/2019

2015 Ford F-250 Super Duty

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Really woke up my stock Speakers but they are showing that stock speakers are not going to cut it

Pros: Definitely helps wake up your speakers

Cons: Shows the weakness of stock speakers

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Good sound

Crutchfield customer from Beaumont, TX on 7/29/2019

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Very clean look to this item. This pairs Very nicely with the ILX-W650. The wiring matched up nicely making it easy. The only reason that slowed me down was my inexperience.

Pros: Small,easy install,

Cons: Gets hot

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0 of 0 found this helpful

Great Unit - Not Great Instructions

Crutchfield customer from Olathe, KS on 7/22/2019

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Surprisingly powerful little unit! Work perfect for my vehicle and aftermarket speakers and head unit. For someone who is not a professional, the instructions provided by Alpine were not fantastic. There was not much direction on mounting considerations (if not using the Alpine head unit it was "made for"). The little unit does get quite hot and does need some room to breath. It would also have been nice if there were more comprehensive instructions on setting the unit up (gain, low pass, high pass). The instructions show the correct buttons but are upside down for the dip-switches. Once I spoke with Crutchfield support, I was able to get my wiring squared away and finished the install without any issues. I would still recommend the unit but just know that unless you are a professional, you may need to watch a few YouTube videos to figure things out. Thanks Crutchfield!

Pros: Incredible sound and power for such a compact unit. Ability to support multiple configurations for stock and aftermarket head units

Cons:

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Alpine KTA-450 Power Pack

Crutchfield customer from Blacklick, OH on 7/20/2019

1997 Ford Ranger

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This amp is great. With its size and the fact that it mounts behind the 650 makes this a great choice. For the size the power and sound quality was very impressive. I only wish that the connection between the amp and the 650 was a bit better. It would be nice if it came with a cable/connection to quickly hook the two together. Instead it requires cutting and crimping a lot of wires together. If you dont trim the wires, you will end up with a large excess of cables that are difficult to stuff behind the radio.

Pros: Power, Sound Quality

Cons: Cable Connection Location

Crutchfield response on

2 of 2 found this helpful

Exactly as advertised

Crutchfield customer from Fort Edward, NY on 7/15/2019

2015 GMC Sierra 1500

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This amp packs plenty of power and produces clean, crisp music at all volumes. The compact size and ability to mount to the back of the Alpine iLX-W650 was a perfect solution for my needs.

Pros: Size, ability to mount to the back of the iLX-W650 & Sound quality.

Cons: Mounting to the back iLX-W650 limits your access to adjust the gain. You need to set it before finishing the install and then leave it.

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The best

Crutchfield customer from Miami, FL on 7/9/2019

2008 Ford F-350

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Amazing purchase! And great customer service

Pros:

Cons:

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Alpine KTA-450 Power Pack

Crutchfield customer from Collinsville, VA on 7/9/2019

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Love the sound

Pros:

Cons:

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Alpine KTA-450 Power Pack

Crutchfield customer from Orange Park, FL on 7/8/2019

2013 Ram 1500

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Easy install. Great output. Clarity is awesome

Pros:

Cons:

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Alpine KTA-450 Power Pack

Crutchfield customer from Rome, GA on 7/6/2019

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Nice and neat Fit for cars that have 1,000's of useless wires behind dash.

Pros:

Cons: For ME...doesn't play loud enough. But still has a Good sound.

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0 of 1 found this helpful

Alpine KTA-450 Power Pack

Crutchfield customer from Lincoln, NE on 7/2/2019

1997 GMC Yukon

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I was debating on adding this to the Alpine ILX-W650 that I bought for my 1997 Yukon GT 2 door. Really glad I did, the added boost really helps.

Pros: Sounds great

Cons: None yet

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Alpine KTA-450 Power Pack

Crutchfield customer from Lexington, SC on 6/14/2019

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I love the convenience of its size and ease of installation.

Pros: Size, installation

Cons: I thought it would perform a little better

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0 of 0 found this helpful

Alpine KTA-450 Power Pack

Crutchfield customer from Vallejo, CA on 6/3/2019

2018 Nissan Frontier SV

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This apm, is to upgrade from factory system and the alpine had unit it attaches to makes it ideal for this purpose. 45 watts is morne then enough power to run 4 speakers. And since the head unit and amp are seperate, whats great is the fact both amp and head unit are the size of a 2 din unit. This amp compliments the Alpine head unit it for its designed and performance.

Pros:

Cons:

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Compact and Powerful

aaron from Long Beach, CA on 4/29/2019

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Awesome amplifier, super compact and easy to install. Sounds amazing with my ILX-W650 head unit, and the "power pack" installation is totally awesome, you end up with a head unit and amp fitting in the space a single double-DIN unit usually takes up. Alpine says you can just tap this into accessory power, too... but Crutchfield recommended I wire it directly to the battery with a fused amp wiring kit. Easy install in my 2010 Ford Escape.

Pros: compact powerful easy install built for compatibility with ILX-W650

Cons: I can't think of any cons

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Alpine KTA-450 Power Pack

Crutchfield customer from Louisville, KY on 4/5/2019

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Compact and powerful. Easy install to the iLX-650

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Product Research

Features

Overview: The Alpine KTP-450 is a Power Pack series amplifier, meaning it's small, and can often be mounted in close proximity to the head unit.

Note: This high-powered amp won't work in systems where an outboard factory amplifier is active. If the vehicle has a factory amplifier, the factory amp must be completely bypassed (this may result in lost speaker channels, if factory amp has more than 4 channels).

Mounting: Two types of mounting brackets are included with the amp, plus four zip ties. The first mounting bracket is designed to mount the amp to the back of Alpine's iLX-W650 digital media receiver. The iLX-W650 is just over 2¾" deep by itself, so even with the added depth of the amp (totaling just over 5"), the combination fits in almost any dash with a Double DIN opening. The bracket also leaves a gap of approximately ¾" between the amp and head unit, so most of the wiring can be routed to that space. The second option is a pair of universal brackets that bolt to the ends of the amp, and provide a mounting flange with four screw holes. The chassis of the amp also has four tabs, through which the included zip ties can be looped to attach the amp behind the dash.

CTA-2006 Compliant: CTA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring amplifier power uses a DC input voltage of 14.4 volts and the RMS power output is measured over a frequency range of 20 Hz to 20 kHz (for full range amplifiers), with 1% or less Total Harmonic Distortion plus noise (THD+N). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CTA-2006 standards allow consumers to compare car amplifiers and receivers under the same conditions (apples to apples).

CTA-2006 Specifications:

  • Power Output: 50 watts RMS x 4 into 4Ω
  • Signal to Noise Ratio: 82 dBA (measured at 1 watt into 4Ω)

Other Specifications:

  • Power Output:
    • 2Ω: 45 watts RMS x 4 (14.4 volts, ≤1.0% THD+N)
    • Bridged: 100 watts RMS x 2 (4Ω minimum)
  • Signal to Noise Ratio: 95 dB (at rated power output into 4Ω)
  • THD+N: <0.1% (at rated power into 4Ω or 2Ω)
  • Frequency Response: 15 Hz to 50 kHz (+0/-3 dB)

Controls: There are DIP switches on the amp to set input signal type, output configuration, and independent controls for the front and rear channel gain and crossovers:

  • Gain: two rotary controls; adjustable from 152mV to 2.8 volts line level and 330mV to 6.05 volts speaker level
  • High Pass Crossover: select 60Hz, 80Hz, 120Hz, or Off (full range)
  • Input Type: set to RCA (line level) or speaker level
  • Amp Configuration: 4-channel or 2-channel (bridged)

Harness: All the wiring for power, input, and output is in one harness. The wires in the harness are one foot long and it plugs into a recessed area on the amp, with openings on the side and bottom, so the wires can be routed in either direction.

Power/Ground: The power and ground wires in the harness are 14-gauge. (Actually each has two 16-gauge wires from the harness, merged to a single 14-gauge wire.) The power wire should be extended and connected directly to the battery, using an in-line 20-amp fuse near the battery terminal.

Note: Neither the amp nor the harness has a fuse, so using an in-line fuse at the battery is absolutely necessary.

Signal Inputs: There are four male RCA plugs on the included harness for line level inputs. If your source unit has no line level outputs, the RCA plugs can be cut off and a speaker level signal wired directly to the discrete positive and negative wires. (You can also use optional Speaker Wire to RCA adapters.)

Note: You will need to connect the amplifier's remote turn-on lead wire (blue/white) to your source unit's remote turn-on lead when using a line level (RCA) input. The amp has a remote sensing feature, so the remote turn-on connection is not necessary when using a speaker level input.

Speaker Output: The harness has unterminated wires for the four speaker outputs.

Dimensions: Because two types of brackets are included, the amp has multiple possible dimensions:

  • Chassis Only:
    • Width: 7.0"
    • Height: 1.33"
    • Depth: 3.56"
  • With Universal Brackets:
    • Width: 7.8" (includes mounting flange)
    • Height: 1.56"
    • Depth: 3.56"
  • With Head Unit Bracket: for mounting to the back of the Alpine iLX-W650
    • Width: 7.0"
    • Height: 3.56"
    • Depth: 2.23"

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
Because this product cover my necessities about my sound system increases the power and is very compact [ Eduardo  Jul 11, 2019 ]
A
You dont go to McDonalds and NOT get a large fry. [ William  Jul 06, 2019 ]
A
great reviews [ FRANCISCO J  Jun 14, 2019 ]
A
To match with the Alpine headunit. [ Russell  Apr 11, 2019 ]
A
Direct compatibility with iLX-W650 head unit. [ MICHAEL J  Mar 07, 2019 ]
SHOW MORESHOW LESS

4 questions already asked

Q
Will the power stack bracket work w/ non-Alpine head unitsâ??Kenwood Excelon KMM-X503 for instance?
[ BriGuy  Jun 19, 2019 ]
2 answers
A
I am under the impression that it will only fit to Alpine head units.
[ Timothy  Jun 28, 2019 ]
A
I don't think so
[ Gilbert  Jun 28, 2019 ]
Q
Can it be bridged as a two channel amplifier?
[ J  May 23, 2019 ]
1 answer
A
Alpine/Crutchfield doesn't provide specs for bridging, so I'd say no.
[ Jay  May 23, 2019 ]
Q
Do I have to connect this to a ground and the battery, or does the supplied adaptor take care of that?
[ Thomas  Apr 07, 2019 ]
1 answer
A
We recommend running a dedicated power and ground wire for the amp for better stability and performance. Technically you don't have to. The amp is capable of using the same power circuit as the radio.
[ Cosmo  Apr 18, 2019 ]  Staff
Q
If I buy this and mount behind the ilx-w650, is there an alpine adapter/harness to connect the two, or do I just use the rca outputs or speaker level outs?
[ Dave  Mar 26, 2019 ]
2 answers
A
The KTA-450 has four RCA inputs to match the W650's RCA line outs. You can, of course, cut off the RCA jacks and connect to the speaker leads on the W650
[ GEOFFREY  Mar 26, 2019 ]
A
RCA connectors that are provided. They are color coded for your convenience. Very easy to install.
[ Timothy  Mar 26, 2019 ]

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