- 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.
-36%
Alpine – Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter – Black
$139.00 Save:$78.00(36%)
Available in stock
Description
Additional information
| Weight | 3.3 lbs |
|---|---|
| Dimensions | 1.5 × 2.63 × 1.5 in |
| MOSFET Power Supply | Yes |
| Maximum Frequency Response | 20 kilohertz |
| Manufacturer's Warranty - Labor | 1 year |
| Bass Boost | None |
| Watts Per Channel Maximum | 45 watts |
| High-Pass Crossover | Variable |
| Number Of Channels | 4 |
| Bridgeable | Yes |
| Minimum Frequency Response | 20 hertz |
| Signal-to-Noise Ratio (SNR) | 80 decibels |
| Product Weight | 3.3 pounds |
| Manufacturer's Warranty - Parts | 1 year |
| Color | Black |
| Model Number | KTP-445U |
| Voice Assistant Built-in | No |
| Line-Level Inputs | Yes |
| Marine | No |
| Amplifier Class | D |
| Preamp Outputs | No |
| Low-Pass Crossover | None |
| Mounting Hardware Included | Yes |
| Product Height | 1.5 inches |
| Product Width | 2.63 inches |
| Remote Control Included | No |
| Speaker-Level Inputs | Yes |
| Product Depth | 1.5 inches |
| Color Category | Black |
| Continuous Watts x Channel @ Ohms | 45W x 4 x 2 |
| Product Name | Power Pack 180W Class D Bridgeable Multichannel Amplifier with High-Pass Filter |
| Maximum Watts x Channel @ Ohms | 45W x 4 x 4 |
| Fan Cooled | No |
| Brand | Alpine |
| Series | Power Pack |
| Total Harmonic Distortion | 0.01 percent |
| Bluetooth Enabled | No |
| UPC | 793276011916 |
Reviews (50)
No products in the cart. 
bosshunt –
The part is good but this part was not. I needed to replace the one I had which was burnt out. But this was an open box one and they had damaged it before they sent it back in. I wish I could have used this thing but back to the store it went.
Subamp –
Gooooooooooooooooooooooooooooooooooooooooooooooood
AlexanderV –
Really powered up my speakers. Big bang for suck a small device
Cody –
About the size of a brick, but outputs awesome sound for your highs & mids to add that concert type sound inside your car.
Davenkat –
No more distortion with this tiny amp. Sounds clean and powerful.
mvic –
perfect fit it installs perfectly behind the dash radio
kingskid –
The Alpine – Power Pack 180 Class D Multichannel Amplifier makes my stereo sound great. It’s great hearing all of the notes in my music.
JamesE –
Game changer when added to the Alpine Ilxw650 meshless head unit. Fits behind head unit and can give more control of highs and mods.
French22 –
The alpine amp is perfect to plug right behind your stock radio packs enough power to get the best out of your sound system
ScottP –
Incredible power that bolts right to the back of your alpine stereo. I paired it with alpine separates and coaxials in the rear. The clean sound is mind boggling and loud..My friends that have paid much more are beyond jealous. Trust me. You will be truly impressed
AnthonyJ –
Power upgrade for all my upgraded door speakers! I love the input gains easy to adjust!
MauricioR –
Big improvement over stock sound very happy with this Amp
HernanC –
Best quality and sound! Perfect on my Jeep Gladiator. Choose always Alpine!
MauricioR –
Big improvement compared to factory sound, big sound from a small unit
CelebrityChef –
I’ve been an alpine fan since the late 90’s and they haven’t disappointed me yet. This little amp adds so much power to your interiors it’s amazing. I’ve gotten older so now I just want to enjoy great music without all the extra bass and all and this does just that.
MitchellG –
It’s so small for the price not enough watts the picture online looks larger
RataConDosPatas –
Ive had it for a little over a year now and it has a Good amount of power for a smaller easier to hide amp compared to other multichannel amplifiers. The last thing i needed to complete my audio setup in my car and with the gain turned up at about 50% i hardly need to raise the volume on my stereo above 15 out of 40 volume. I highly recommend getting some sound dampening and speaker baffles to avoid any possible rattle.
StephenAnthony –
This amp is amazing! Got it installed a couple of months ago and it has definitely enhanced my overall audio system. Needed this to go along with my sub as my 2022 Honda Civic Sport amp wasn’t very good and didn’t enhance the sound to what I wanted.
MiguelC –
Is small, easy to install, to hide i like the product
LawrenceC –
Very satisfied with this little amp. Just enough bump to my factory head unit and after market speakers.
Willy77 –
Installed in a 2023 Rav4 and it brings it back to life! Amazing quality.
Bear75 –
Installed many of these and they have been great! Easy to bury, easy to install and these sound wonderful! And the best part is that they don’t take that much power!
ChristopherT –
Awesome amp good power definitely pushes speakers to limit that I have
Cody –
This product is great for the money and the size highly recommend if you want to keep that factory look inside your car
Cjmarine75 –
Does exactly as it’s supposed to. I had it insurable at best buy as well
Scott –
Highly recommend for the Subaru BRZ / 86 / FRS for an oem amp replacement!
Juan –
I have this installed on my can-am spyder and it sounds great I can hear my music at highway speeds. Music sounds clear and clean will recommend to others great sound in a small package.
NickP –
Works great. Definitely louder and what I needed.
Joey –
Installed with speaker inputs in a toyota highlander but it has constant hissing outputs on all channels. Only goes away when the gain is reduced to almost nothing. But cranking it up sounds great. Unfortunately the hissing means it has to go.
SamanthaG –
John is lovely, great installer. He taught me step by step with all the in’s and outs with my new equipment. I got Everything!!!
Tony –
was installed in a 2023 tacoma, sound really good. I also had best buy install an alpine head unit amp and jbl speakers really made speakers sound great
Spike –
This is a great little amp this is my 5th one works great on my interior speakers
PaulT –
This is a great little amp for stock head units that don’t have enough power to run aftermarket speakers! I have it in 2 of my cars and it works great! Plus very easy to install and hide in the dash! Highly recommend it for folks who are looking for more power!
RonH –
Gives my new 6x9s a nice kick. Fills my f150 regular cab with sound.
KevinJ –
Great amp really give it that high end sound worth every penny
StuartR –
Product is very small so it is hid away so you can’t see it
SLINGSHOTdj –
Compart and the sounds are great. Perfect addition to my Slingshot
Jayy –
Very small fit right behind the factory stereo and made the new JBL 6.5s (x4) scream. Better than you would expect from such a tiny amp on 180 watts.
TeresaAlexander –
Fantastic!works well,great customer service.!!!!!!!!!!!!!!!!
KalebD –
Works very well and has handled a beating on a 3400 mile road trip
TonyHall –
Excellent receiver! Really helps to boost music level and puts forth quality sound!
Meej1782 –
Great small amp for oem stereo in my 2023 tacoma would reccomend
JRock –
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 6×9 speakers …. From a pioneer wireless CarPlay headunit. It makes a world of difference – 4×40 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.
AndrewjF –
Great power in a small package. Fits perfectly behind the dash.
Unknown –
Mounted perfectly to back of the alpine multimedia player radio. Speakers sounded clear and crisp. Plenty of power.
Lcalvojr –
Very good I have had it in the past and it always performs as expected. You get clear sound at high levels and you get crystal clear sounds at low levels.
JamesN –
I have installed about 100 of these. They are one of the best bang for the buck units that have came out in the last 20 years
zowl –
These things are so easy to install its dumb to not get of these for your car (assuming you have aftermarket speakers). These things make your speakers sound so so so much better than the stock radio power output. Highly recommend to everyone.
46and2 –
If you temper expections and remember this isn’t a 1000 watt amp (45×4 is only 20 watts more than a good aftermarket head unit) you should be satisfed with this. It is one nice little power pack. Easy diy install.
KevinY –
Not worth buying,to weak for the effort of installing