Last Updated: December 1, 2019 (Refresh Now)
Alpine KTP 445U 4 channel Power Pack Amplifier
Last Updated: December 1, 2019 (Refresh Now)
8.1
SCORE
/10
Total Reviews
686
Old Reviews
549
Unverified
55
Spam Test
PASS
Review Analysis - 82 recent, verified reviews
Detailed Mode
Sound Quality
49little amp, alpine, kicker, gain, volume
+92%
-8%
" ... It's good enough with the stock system and speakers. ... "
" ... Kicker speakers now have much more volume, clarity, and just enough oomph. ... "
" ... Pushes 4 6.5 3 way speakers and gives them exact amount of power!! ... "
" ... What a wonderful, tiny little amp. ... "
" ... It can be set for line level input or speaker level input. ... It sounds very good and offers front & rear gain controls and switchable low frequency filters in case you'll be using a sub-woofer. ... "
" ... Music is plenty loud and highs are crisp and clean. ... "
" ... They put out great power and sound great. ... I highly recommend this for a small compact amp. ... "
" ... Fantastic little amp! ... "
Setup
14easy to install, head unit, easy, amp, straight forward
+93%
-7%
" ... Cool little unit easy to install. ... "
" ... I did not find the installation particularly easy, and found the supplied cables far too short for what I needed it to do even though it was dash-mounted. ... "
" ... Was able to install this in my toyota with relative ease. ... "
" ... Super small easy to install. ... "
" ... By far the EASIEST amp to install. ... "
" ... This little amp is straight-forward and easy to install. ... "
" ... Simple to install. ... "
" ... Easy to install and setup. ... "
Ease of Use
13easy, install, wire, straight forward, simple
+100%
" ... Cool little unit easy to install. ... "
" ... Super small easy to install. ... "
" ... easy to wire up. ... "
" ... This little amp is straight-forward and easy to install. ... "
" ... Simple to install. ... "
" ... Easy to install and setup. ... "
" ... The directions it comes with suck, but with patience and with online help I feel this is worth it. ... "
Volume
11volume, kicker, amp, volumes, speakers
+82%
-18%
" ... It can be set for line level input or speaker level input. ... "
" ... Music is plenty loud and highs are crisp and clean. ... "
" ... audio quality improved, but volume was still wanting. ... "
" ... Sound and volume were immensely improved. ... "
" ... Kicker speakers now have much more volume, clarity, and just enough oomph. ... "
" ... The extra power adds punch at low and high volume levels. ... "
" ... My factory system sounds like an aftermarket system now so loud rich and powerful sounds extreme clarity a must have!!! ... "
" ... Kicker speakers now have much more volume, clarity, and just enough oomph. ... "
Fit
9amp, glove box, behind, zip, jeep
+100%
" ... Small unit can fit in your glove box, under a seat or hidden somewhere else in your vehicle. ... "
" ... Its small and fits behind the dash for a clean look ... "
" ... It fits almost anywhere I placed it behind the screen with zip ties. ... "
" ... It's quite small often allowing for installation in the dash (or in my case, replacing the Bose amp in my Miata and easily fitting in that space). ... "
" ... It is small and easy to hide somewhere inside the dash. ... "
" ... I was looking for somthing small I could mount behind the dash. ... "
" ... This fit just in the dash between my head unit and glove box in my 2002 Jeep Wrangler so it's completely out of sight. ... I have it zip-tied to my vent tunnels nice and secure. ... "
" ... The amp fit behind the glove box easily. ... "
Price
8beat, worth every penny, waste, think, money
+88%
-13%
" ... Available at a great price here. ... "
" ... Alpine quality at a great price. ... "
" ... Can't beat this for the price! ... "
" ... Can’t beat it for the price. ... "
" ... Worth every penny. ... "
Cables
8wires, harness, wiring harness, wiring, rca
+50%
-50%
" ... My only complaint is wiring is a huge mess. ... They could have put male RCA connectors on, or included couplers, but instead they have female and most (probably all) head units have female connections as well. ... One of the wiring harnesses on the amp wouldn't unplug after being plugged in, no matter how I tried. ... This made tidying up the wires harder. ... While not a huge device, the wires coming out each side do make it "long", which made it difficult to fit as the wires need room to bend. ... All my connections were tight and I couldn't find where maybe a wire got chaffed so who knows what happened. ... "
" ... The output wires (rca) are short when clipped off, be prepared to spend a bit of time extending them or buying the extension. ... "
" ... There are two blue wires which is potentially confusing. ... The input side blue wire should go to the head unit blue wire. ... The output side blue wire is optionally used to pass through the turn on signal to another amplifier. ... "
Size
7size, compact, amp, powerful, form
+100%
" ... Very small, enough power, love it! ... "
" ... Compact size, clean sound, very powerful ... "
" ... This one is a great size to go in places other amps are just to large for. ... "
" ... I highly recommend this for a small compact amp. ... "
" ... and it's small! ... "
Product Reliability
6defective, running, replaced, months
+67%
-33%
" ... Replaced fuse and everything was fine. ... "
" ... It's only been running a couple of months, but so far so good. ... "
" ... Almost two years later and still works perfectly! ... "
" ... The entire system has performed great for over 2 years now. ... "
Cleaning
6car, alpine, loud, highs, crisp
+100%
" ... Its small and fits behind the dash for a clean look ... "
" ... Balanced nicely with a small powered sub for a clean car system? ... "
" ... The bottom line for this Alpine amp, though, is it's great for providing clean, awesome power to your everyday car! ... "
" ... Music is plenty loud and highs are crisp and clean. ... "
" ... Just commanding and clean. ... "
FM
5fm, class, amp, behind, stock
+80%
-20%
" ... Had little room to hide it behind the radio. ... "
" ... They managed to tie it in directly to the factory radio harness, including power, and mounted the amp behind the head unit. ... "
" ... Installed this in my 11 jeep jk with stock radio. ... "
Bass
4kicker, head unit, blockers, alpine, sub woofer
+100%
" ... You won't be rattling windows with bass but is for sure a noticable improvement over my after market head unit alone. ... "
" ... It sounds very good and offers front & rear gain controls and switchable low frequency filters in case you'll be using a sub-woofer. ... "
" ... Much more mid-bass that I had been looking for. ... "
" ... All the bass I need is supplied by the sub system. ... "
For Running
3months, car, amp, alpine
+100%
" ... Much nicer then running a distribution block and a second amp ... "
" ... It's only been running a couple of months, but so far so good. ... "
" ... Had it up and running in like 10 minutes. ... "
Device Compatibility
3spotify, speaker, level input
+100%
" ... It can be set for line level input or speaker level input. ... "
" ... Amazing little device. ... "
" ... My primary audio sources are either Spotify streamed via Bluetooth from my phone, or the head unit's built-in SiriusXM tuner . ... "
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Specifications
No specs available.