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Alpine KTP-445U-open box

Universal Head Unit Power Pack for Use with all Aftermarket & Factory Receivers

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Alpine KTP-445U-open box

Universal Head Unit Power Pack for Use with all Aftermarket & Factory Receivers

$134.95

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  • Alpine Universal Power Pack 4-Channel Class D for All In-Dash Receivers
  • Increases the output of any headunit without having to install a full size amplifier and amp install kit
  • The fast and easy solution to higher power aftermarket sound
  • RMS Power Rating:
    • 4 ohms: 45 watts x 4 chan.
    • 2 ohms: 45 watts x 4 chan.
    • 4 ohms: 90 watts x 2 chan. (Bridged)
  • Total RMS power output: 180 watts
  • Independent Front/Rear gain switch is adjustable from high to low
  • Runs off receiver's power circuit
  • High-Pass Filter: selectable 60/80/120 Hz @ 12 dB/octave
  • Fast and simple installation
  • 4 channel operation for four speakers
  • Minimum impedance of 2 ohms
  • Is not compatible with factory amplifiers
  • CEA-2006 compliant amplifier
  • Frequency response: 20-20,000 Hz
  • Fuse Rating: 15A x 1
  • Dimensions: 7-13/16D x 2-9/16"W x 1-1/2"H
  • 1-year SonicElectronix.com warranty

Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

45 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

45 watts x 4 channels
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

90 watts x 2 channels

Power Specifications - Full Range Channels

Peak Power @ 4 ohms
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 2 ohms
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 1 ohm
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Bridged Peak/Max Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the Peak/Max power created once an amplifier is bridged.

Power Specifications - Subwoofer Channel

Peak Power @ 4 ohm
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 2 ohms
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 1 ohm
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Amplifier Specifications

Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

D
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

180 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
Wire Harness
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
1%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Yes
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
No
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

None
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
81 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
15A x 1 
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

Yes
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
Hi-Res Audio Compatible
This feature refers to if the product is capable of Hi-Res Audio (HRA) playback.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

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Browse 13 questions and 37 answers
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Why did you choose this?
Sonic Electronix Store
I had limited space in my '14 Wrangler. Thought I would try the amp out to run my Polk 6.5" in the rear and my Polk 6.5 components in the front. It does a great job for such a small package.
Matthew W on May 26, 2016
Amp is a perfect 4 channel amp for my small/medium sized speakers and it can be tucked away in the dash plus it can be powered directly from the head unit and no need to go to the battery!
Fahim A on Oct 21, 2015
Great 4ch amp that can be bridged to 2ch. Low power consumption, small footprint. I've used this amp to power main speakers and also used this amp in other applications to power 2 small subwoofers. Love this amp.
Stephen I on Mar 8, 2016
Best compact amp out there! Easily fits behind most stereos in dash.
Rory O on May 14, 2015
The title says its for aftermarket and factory receivers, descriptions says it's not for factory receivers. Which is it???
zac p on Sep 2, 2015
Best Answer: This amplifier is actually for Alpine headunits. Thanks for bringing that up we'll have our descriptions team fix that.
Reply · Report · Enrique S.Staff on Sep 2, 2015
· Add Answer · I Have This Question Too (3)
If I choose to run the the amp in the "2 channel" mode would that be 90W X 2 instead of 45W X 4?
Jon K on Sep 30, 2014
Best Answer: Hello,

There are two ways to answer this, so please read carefully to get the answer to your specific approach.

1) If you only use, say, Ch 1 & 2 , but do not use Ch 3 & 4 , you will only receive 45wRms per channel.

2) If you Bridge (Ch 1 w/ 2) & (Ch 3 w/ 4) THOSE newly created Two channels will provide 90wRms .
Reply (1) · Report · Customer SStaff on Sep 30, 2014
· Add Answer · I Have This Question Too (3)
Hi there, I am wanting to look at using this for a set of Apline SPR-60C components up front, and SPR-60 coaxials in the rear. since the speakers are rates 110w and this 45w, am I going to be causing damage by underpowering them? Cheers
Ben W on Sep 9, 2014
Best Answer: Hello Ben,

Out of the box and right away, this setup will Not cause any damage. However, obviously DON'T expect a 100w+ experience per speaker. If you push the Amp to Clipping, then THAT will cause damage to Any speaker. Really the only "concern" here - besides clipping, which is on you not the product - is that you are going to spend your budget on a set of speakers that are at their Optimum Quality when being power 75-100% of what they ask for; ~45w RMS will be under 50%. A better 'match' will be the S-Type series, but that - like all things Car Audio - comes down to Your preference.
Reply · Report · Customer SStaff on Sep 9, 2014
· Add Answer · I Have This Question Too (1)
Hey guys, will this product work if I have a line out converter as well? I drive an 09 Chevy Impala with the factory head unit (hence the LoC). The Line Converter is PAC AOEM-GM1416A. Thanks!
A shopper on Feb 2, 2015
Alpine KTP-445U
Alpine KTP-445U
PAC AOEM-GM1416A
PAC AOEM-GM1416A
Best Answer: I initially had an AudioControl Lc2i between my factory head unit and the Alpine amp. I ended up taking the Lc2i out and running high level inputs from the head unit to the Alpine. I honestly believe the sound is better without the line converter inbetween.
Reply · Report · Shane B on Feb 3, 2015
· Add Answer · I Have This Question Too (0)
So I have a aftermarket JVC head unit that puts out 22rms x4channel, would this alpine amp just add more rms so would it be 45+22rms to equal 67rmsx4channel ?or would the speakers only get 45rmsx4channel and not include the power of headunit?
Thanks.
Simpson29 on Nov 19, 2014
Best Answer: Hello Andrew,

You ONLY get what the amp Provides. In this case, it will in fact be the 45w RMS x 4.
Reply · Report · Customer SStaff on Nov 22, 2014
· Add Answer · I Have This Question Too (0)
Im thinking about purchasing this but my factory speakers are part of a bose system....what do you suggest??
A shopper on May 29, 2015
Best Answer: Your bose system probably sounds better without this. If you're looking to upgrade get a proper 4 channel amp and upgrade the entire system
Reply · Report · piyush s on May 29, 2015
· Add Answer · I Have This Question Too (0)
Im trying to hook this up, any tips on how to do this?
Dustin D on Dec 29, 2014
Best Answer: If you've never wired up an amp before look on YouTube for a how to video, or take it to a stereo shop and have them do it before you blow something up. It's pretty straight forward. Power, ground, turn-on, and plug the rcas in.
Reply (1) · Report · Alex M on Dec 29, 2014
· Add Answer · I Have This Question Too (0)
Hey I was wondering if on this "Power Pack" or any other, can you control the high-pass filter separately for the front and rear speakers? I like most people have smaller speakers in front than in the back.
dan6777 on Nov 3, 2016
Best Answer: Yes, I believe this and most 4 channel amps have a separate crossover for front and rear channels. The degree (frequency) at which you can set them varies however. Some speakers have a built in crossover as well., be cautious of tweeters as they been an in line crossover to filter out any lower frequencies
Reply · Report · Chad E on Nov 3, 2016
· Add Answer · I Have This Question Too (0)
I have a 2013 GMC Acadia Non Bose Factory Radio, i want to install the KTP-445U amp to add more power to the system. How do I hook up a 12 volt accessory power to this amp. This Acadia does not have this wire. This GMC has the 29-Bit Data Lan wire that powers on the radio. BTW will connect 12 volt constant to radio since it has a 15 amp fuse. Any Thoughts?
KY2112 on Aug 11, 2016
Best Answer: Without knowing the wiring diagram for the vehicle id say find an acc/ign switched fuse at the fuse panel and tap it there since all you need is a trigger wire
Reply · Report · harold k on Aug 11, 2016
· Add Answer · I Have This Question Too (0)
Will this fit Orem Dodge Journey head unit?
A shopper on Mar 29, 2016
Best Answer: I'm not a installer, but I had mine installed behind my Honda Ridgeline head unit.
Reply · Report · brett o on Mar 30, 2016
· Add Answer · I Have This Question Too (0)
can this amp be bridged to 2 channels @ 2 ohms? For 90x 2
A shopper on May 11, 2015
Best Answer: No, it cannot. Bridging the amplifier will obligate the setup to a 4ohm final load and above. Anything less will harm the amp and void the warranty.
Reply · Report · Rick MStaff on May 11, 2015
· Add Answer · I Have This Question Too (0)
If I am using the KTU-445U connected to a head unit that has 2V outputs compared to a unit with 4V outputs does it make any difference in quality of sound? In otherwords can I go with a less expensive HU with 2V outputs and not notice any difference in sound quality because I am going through the KTU?
b m on Jan 10, 2015
Best Answer: Thank you.. Being I am spending a fair hunk on the new system, it sounds as if to keep the monster inside of me at bay I better use a 4V system.. lol..
Reply · Report · b m on Jan 12, 2015
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

KTP-445U

Weight

2.40lbs

Internal SKU

LS-ktp445u-OB

Internal Product ID

91566

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Alpine KTP-445U-open box