Condition:
4.84.8 out of 5 stars
122 product ratings

  • 5stars

    107ratings

  • 4stars

    9ratings

  • 3stars

    2ratings

  • 2stars

    0rating

  • 1star

    4ratings

91 reviews

by Most favourable review

Great for improving sound quality from factory radio

I was finally able to install this after a few months of having it. It does have better sound quality than the factory head unit. I also replaced the door speakers with quality ones to match the sound. I was able to set the gains and stuff it under my dash. I also purchased a harness side wire harness, and a stereo side wire harness to solder the inputs and outputs to. I also grounded the amp to the head unit and the chassis. My only beef with this unit is that the bass doesn't hit as hard as I would have liked from adding 180 watts to my stereo system. This is why i took away 1 star. This is not the seller's fault at all, just my pickiness. All in all, I'm happy with this as I'm not looking to make noise going down the road, just hear my music with better quality. There is no alternator whine, and it does what it's supposed to do. Read full review

by Most critical review

alpine ktp-445u

This is a nice little amp. Not bad but perhaps too few watts for my liking. I connected it to the rca outputs on my new jvc head unit but it doesn't seem to have more usable power than the head unit. I am not an audio expert but I have been playing guitar in bands for about 40 years. Thanks Read full review

Verified purchase:  Yes • Condition: pre-owned • Sold by: ckmekrut10hr8

by

Compact and good power

Very good price brand new, and very versatile. Small enough to hide inside your dash. These are a solid state unit so not much to go wrong with these so don't be afraid to purchase one of these used as well - long as it has both wire harnesses its supposed to come with. 45 watts RMS per channel may not seem like a big power number, but it is a world of difference on a factory radio (without external amp already) or even any aftermarket head unit, most of which you're probably lucky to get 10 watts RMS per channel with. Has no problem reproducing low tones for your door speakers, and even for a low price class D amp it can do the highs clearly as well.
It's made to plug completely into all your factory speaker outputs and power/ground wires, has four-channel input so you don't lose your fader at the head unit. Another useful feature is its low pass crossover that can be set at several frequencies - useful for if you're still using factory door speakers, and/or have an added subwoofer system.Read full review

Verified purchase:  Yes • Condition: pre-owned • Sold by: krim067

by

Perfect fit for my s197 2005 ford mustang coupe

Installed this little guy behind my new single DIN mechless pioneer deck. Since i have the shaker 500 system and am still using the shaker subs, i opted to use the Pioneer RCA's for the factory subs and use the line level inputs to feed the Alpine powering the 4 full range speakers. The pioneer head unit was loud enough to begin with but adding the Alpine made everything so much louder and clearer. The Alpine does get a bit warm when in use but its negligible. I have the gain set at 25% and there's no need to go higher. All in all i am happy with my setup and would use the amp again. Install was pretty easy and straightforward. When i swap the shaker subs i will reconnect the RCA jacks to the alpine to see if there is any improvement in sound.Read full review

Verified purchase:  Yes • Condition: new • Sold by: carsoundelectro...

by

Is better than the Alpine head units 18w RMS x 4. Bass is more controlled and hits harder.

It was a nice Plug and Play and way too much wiring to try and put somewhere. Had to put wireloom on all of it for protection against the sharp edges of Civic dash braces.

For my 2002 Civic LX sedan it would have fit better behind my accessory plug panel if it was a little shorter.
I cut some 1/4" rubber pieces to put on the right and left side to protect the wires coming out of the amp from those sharp edges of the braces.

It will only fit with the label facing outward(or 180 inward) since that is the thinnest dimension or the accessory plug will hit when installing that panel. Read full review

Verified purchase:  Yes • Condition: new • Sold by: www-sonicelectr...

by

Great for what it is

My previous car audio setup before adding this was alright but not great I could hit about 14 on the head unit (new alpine one) with brand new speakers before major distortion started to occur. After adding this it boosted the sound level at lower volumes as well as allows me to reach a higher level of sound before the distortion occurs. It is also great in that at least in my vehicle it can hide behind the head unit and not have to worry about running any wiring. Read full review

by

Great Amplifier

The small 4 channel amp is powerful enough to satisfy your audio desires. I paired the amp with two pairs of 4-way Pioneer 6x8 speakers. I’m able to turn the volume up a lot louder, now that I have the amp. Previously, the sound would distort at about 60% max volume. Now, I can turn the radio all the way up and it just sounds better!Read full review

Verified purchase:  Yes • Condition: new • Sold by: wpmore

by

A truly amazing amplifier from Alpine!

A great amp. Just read any of the many pro reviews online and you'll find that nobody has anything bad to say about this amp. It's a marvelous piece of engineering. It's bridgeable to 90 RMS x 2. It's extremely efficient so it won't over work a vehicles electrical or charging system. It's compact in size and doesn't generate much heat. It's very clean with impressive numbers all around. If you're buying something cheaper...you're certainly getting something cheaper. If cheaper is what you're trying to achieve, then good luck. For those of you that can recognize a winner...here's your champ!Read full review

Verified purchase:  Yes • Condition: pre-owned • Sold by: mc-parts-n-audio

by

Amp is in goodAlpine KTP-445U Universal Power Pack Compact Car Amplifier, Light Use No Box #U4 condition

Didn't expect for it to be as described. Wish they had the harnesses tho.

Verified purchase:  Yes • Condition: pre-owned • Sold by: tippytopyorks

by

KTP-445A VS KTP-445U

Make sure to get the 445U model if you have any make but ALPINE
cuz the 445A is made for alpine and it has less options than the 445U, I ordered the 445A thinking it was the 445U and I had to do some modifications to make it work for my factory radio and it did work but not as good as the universal 445U , the one I’ve got doesn’t have the frequency adjustment neither the gain adjustments after all I told myself that I have to post this so ppl don’t do the same mistake that I did.
You will be able to tell the difference once it’s all installed the right way
I read so many reviews and I am amaze of ppl, the reviews will pick you up for a minute and then will slam you down to the ground
It worked for me but somehow it didn’t work for others and all the reviews that I read didn’t do me any good
I had to try for myself and I am happy with what I’ve got ( not really ) cuz I ordered the wrong one but at the end it’s still an alpine and that’s pretty good enough for me
Thank you for reading and good luckRead full review

Verified purchase:  Yes • Condition: new • Sold by: bearwife1234

by

Perfect!

Bought the power pack , 143bt headunit, type s6.5 component set , and type s 3 way 6x9s all alipne . Very very happy with the purchase . Perfect set up !!

Verified purchase:  Yes • Condition: new • Sold by: audiosavings

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