Alpine - Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter - Black
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Specifications
- Continuous Watts x Channel @ Ohms45W x 4 x 2Maximum Watts x Channel @ Ohms45W x 4 x 4Amplifier ClassDNumber Of Channels4Bass BoostNoneBridgeableYes
- Key Specs
- Continuous Watts x Channel @ Ohms: 45W x 4 x 2
- Maximum Watts x Channel @ Ohms: 45W x 4 x 4 (This is the maximum load the speaker, subwoofer or amp can drive.)
- Amplifier Class: D (An amplifier's mode of operation, specifically the conditions in which its electrical current flows for the duration of an audio signal, determines its class. Each class has its strengths and weaknesses when it comes to power efficiency, levels of crossover distortion, and overall sound quality.)
- Number Of Channels: 4
- Bass Boost: None (Circuitry that boosts the bass response of the amplifier, improving audio reproduction enhancing the sound of low frequencies. Fixed boost means the level of bass response is preset, whereas variable boost allows the user to make adjustments.)
- Bridgeable: true (Bridging an amplifier increases the power it supplies to the speaker(s).)
- Low-Pass Crossover: None (Devices with this function allow only audio frequencies below a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
- High-Pass Crossover: Variable (Devices with this function allow only audio frequencies above a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
- Speaker-Level Inputs: true (Also referred to as high-level inputs. Enables the amplifier to receive a sound signal from another device that does not have RCA, or low-level, inputs.)
- General
- Brand: Alpine
- Model Number: KTP-445U
- Product Name: Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter
- Color: Black
- Mounting Hardware Included: true
- Audio Power
- Continuous Watts x Channel @ Ohms: 45W x 4 x 2
- Maximum Watts x Channel @ Ohms: 45W x 4 x 4 (This is the maximum load the speaker, subwoofer or amp can drive.)
- Watts Per Channel Maximum: 45 watts
- Amplifier Class: D (An amplifier's mode of operation, specifically the conditions in which its electrical current flows for the duration of an audio signal, determines its class. Each class has its strengths and weaknesses when it comes to power efficiency, levels of crossover distortion, and overall sound quality.)
- Audio
- Number Of Channels: 4
- Minimum Frequency Response: 20 hertz (Describes the maximum range of frequencies or musical tones a product can reproduce, from very low tones to very high treble tones. The minimum frequency or musical tone the speaker can reproduce. High treble tones have higher frequencies while low tones and deep bass have lower frequencies.)
- Maximum Frequency Response: 20 kilohertz (Describes the maximum range of frequencies or musical tones a product can reproduce, from very low tones to very high treble tones. The maximum frequency or musical tone the speaker can reproduce. High treble tones have higher frequencies while low tones and deep bass have lower frequencies.)
- Total Harmonic Distortion: 0.01 percent (Measurement of the harmonic sound distortion. The lower the percentage, the cleaner the sound.)
- Signal-to-Noise Ratio (SNR): 80 decibels (The ratio of the desired signal's strength to the level of background noise. A ratio higher than 1:1, which equates to greater than 0 decibels, indicates more signal than noise.)
- Bass Boost: None (Circuitry that boosts the bass response of the amplifier, improving audio reproduction enhancing the sound of low frequencies. Fixed boost means the level of bass response is preset, whereas variable boost allows the user to make adjustments.)
- Features
- Bridgeable: true (Bridging an amplifier increases the power it supplies to the speaker(s).)
- Low-Pass Crossover: None (Devices with this function allow only audio frequencies below a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
- High-Pass Crossover: Variable (Devices with this function allow only audio frequencies above a chosen cut-off frequency to pass through to a speaker or sound system. A device may have a cut-off frequency predetermined by its manufacturer (fixed), multiple cut-off frequency options to choose from (selectable), or have the capability for the frequency to be configured by the user (variable).)
- MOSFET Power Supply: true (A specific type of power supply with the advantages of high switching speed and efficiency at low voltages.)
- Bluetooth Enabled: false (The device is capable of communicating with another device via Bluetooth, provided they are within the required range of each other. A Bluetooth-enabled device must also be the same Bluetooth version or higher than the accessory it is intended to pair with.)
- Remote Control Included: No
- Marine: false
- Fan Cooled: false
- Input
- Line-Level Inputs: true (Also referred to as low-level inputs. Enables the amplifier to receive a sound signal from another device via RCA cables.)
- Speaker-Level Inputs: true (Also referred to as high-level inputs. Enables the amplifier to receive a sound signal from another device that does not have RCA, or low-level, inputs.)
- Output
- Preamp Outputs: false
- Dimensions
- Product Height: 1.5 inches (The out of box height of the item. Height is measured as the vertical distance from the bottom of the item to the top as it would be primarily used or placed.)
- Product Width: 2.63 inches (The out of box width of the item. Width is measured as the horizontal distance from one side of the item to the other as it would be primarily used or placed.)
- Product Depth: 1.5 inches (The out of box depth of the item. Depth is measured as the distance from the front of the item to the back as it would be primarily used or placed.)
- Product Weight: 3.3 pounds (The out of box weight of the item.)
- Warranty
- Warranty - Parts: 1 year
- Warranty - Labor: 1 year
- Compatibility
- Voice Assistant Built-in: No (A digital assistant built into the device that uses voice commands to answer questions and control smart devices.)
- Other
- UPC: 793276011916
Give your car stereo system a power boost with this Alpine Power Pack KTP-445U 180W Class D bridgeable 4-channel amplifier that features a 12dB/Oct high-pass filter for powerful sound.
- Geek Squad installation: is strongly recommended for this product. Please visit your local Best Buy store for details.
- Handles up to 45W RMS (continuous) @ 4 ohms or 2 ohms: For powerful sound. Up to 90W continuous bridged.
- 12dB/Oct high-pass filter: Along with variable gain ensures flexible operation.
- 4 ohms bridged impedance: Conducts power evenly to keep the speaker at an appropriate level.
- RCA and auto sensing speaker-level connectors: Enable simple installation.
- Geek Squad installation: is strongly recommended for this product. Please visit your local Best Buy store for details.
- Handles up to 45W RMS (continuous) @ 4 ohms or 2 ohms: For powerful sound. Up to 90W continuous bridged.
- 12dB/Oct high-pass filter: Along with variable gain ensures flexible operation.
- 4 ohms bridged impedance: Conducts power evenly to keep the speaker at an appropriate level.
- RCA and auto sensing speaker-level connectors: Enable simple installation.
Whats Included
- Alpine Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter
- Wiring harness with RCA connectors
- Owner's manual
- Alpine Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter
- Wiring harness with RCA connectors
- Owner's manual
Q: Is this amplifier compatible with Geek Squad® installation?
A: Yes, Geek Squad® installation is strongly recommended for this product.
Q: How much power can this amplifier handle?
A: This amplifier can handle up to 45W RMS (continuous) @ 4 ohms or 2 ohms. Up to 90W continuous bridged.
Q: What is the bridged impedance of this Alpine amplifier?
A: The bridged impedance of this amplifier is 4 ohms.
Q: What kind of speaker-level connectors does this amplifier have?
A: This amplifier has RCA and auto sensing speaker-level connectors for simple installation.
Q: Does this amplifier have a high-pass filter?
A: Yes, this amplifier features a 12dB/Oct high-pass filter for powerful sound.
A: This amp has real power I turned it down so as not to blow my kicker door speakers that can handle much more power.
A: Many people focus too much attention on the rear speakers. Rear speakers are for "rear fill". If your front speakers are able to create a good front stage and proper imaging AND be able to play clearly at high volume levels to balance out the subs, rear speakers are usually not necessary. Take out the 6X9s that reside in your rear deck. If you feel the need to put rear speakers later on, go with something small like a 5.25 in a coax.
Q: Can this amp be mounted in the fairing on a Harley Davidson?
A: Yes it can. It is mounted in mine and it sounds great.
Compare similar products
Give your car stereo system a power boost with this Alpine Power Pack KTP-445U 180W Class D bridgeable 4-channel amplifier that features a 12dB/Oct high-pass filter for powerful sound.
Turn it up to 11 with this KICKER four-channel amplifier. With 200W of raw power, this amplifier boosts the potential of OEM or aftermarket stereos for effortless incorporation. Acoustic correction provides concert-quality sound, while FIT2 technology ensures compatibility with nearly every stock or custom stereo system on the market. This KICKER four-channel amplifier supports the start/stop technology found in hybrids and other gas-savers, ensuring unimpeded enjoyment.
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| Pros for Alpine - Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter - Black | |||
|---|---|---|---|
| Sound Quality, Size, Power, Ease of use, Installation | Sound Quality, Size, Power, Ease of use, Volume | There were no pros for this product— | Sound Quality, Power, Ease of use, Size, Price |
| Cons for Alpine - Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter - Black | |||
| Heat, Instructions | There were no cons for this product— | There were no cons for this product— | Heat |
Specs
Reviews
Customers are saying
Customers highly value the Power Pack 180W Class D Bridgeable Multichannel Amplifier for its exceptional sound quality, compact size, and ease of installation. Many customers rave about the remarkable sound improvement it brings to their audio systems, particularly the front speakers. The compact design of the amplifier is also widely appreciated for its convenience and versatility in various installations.
Customer Images
The vast majority of our reviews come from verified purchases. Reviews from customers may include My Best Buy members, employees, and Tech Insider Network members (as tagged). Select reviewers may receive discounted products, promotional considerations or entries into drawings for honest, helpful reviews.
- Rated 5 out of 5 stars
I Highly recommend the 445u
This amp was my first car audio purchase since college…. Tech has caused things to shrink, yet still be efficient- this amp is an example of that. Before I begin - let me say I like a clean factory look…. I try to keep things factory but the sound was terrible. It is in my 2010 FJ Cruiser…. Pushing new component 6x9 speakers …. From a pioneer wireless CarPlay headunit. It makes a world of difference - 4x40 rms for sure - just enough to be loud and clear…. I haven’t pushed the speakers yet as I don’t blast things- but music is so much more different with an amp. You’re missing details in your music if you’ve only ever used a stock stereo- yes even jbl. If you like that factory look- this will work with your factory radio- an extremely easy install as well …. This amp takes up very little space but does its job very well. Super easy install as it can run off the headunit within certain parameters…. Just get it.
Posted by JRock
- Rated 4 out of 5 stars
Great Little Amp!
Great little amp. Got it for my '78 F150 to run door speakers & 6x9s behind seat. Loud, clear sound. Nice compact size. I have it temporarily mounted with zip ties in the pics. (The actual mounting brackets are missing but that is Best Buy's fault) Plan to remount it more securely later. Only reason I didn't give it 5 stars is the location of the adjustments, gain, etc.
Posted by Installed
- Rated 5 out of 5 stars
regalo a mi 72 chevy
Alpine with excellent quality of very practical audio and its small size very easy for installation. buy 2 and I am very satisfied by suc
Posted by JaimeC
