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Old 04-20-2012, 12:25 PM   #1
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Alpine KTP-445U

Has anyone bought Alpine's new KTP-445u amp? I bought my 2012 JK two Fridays ago, and I'm looking to upgrade the sound system (Sport S, base sound system), but I really want to keep the factory HU. I'm also looking at the Polk DXi 650s and 6500 for the soundbar and front.

With the KTP-445u, keeping the factory HU seems like a doable option. Thoughts?

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Old 04-20-2012, 01:22 PM   #2
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ummm depends on what you are trying to do. You can't just plug the amp in and off you go.

have a look a these threads, there will be other parts necessary

http://www.wranglerforum.com/f33/diy...ll-151872.html
or
http://www.wranglerforum.com/f33/why...er-152077.html

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Old 04-20-2012, 01:27 PM   #3
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From my understanding, this amp is designed to plug and play with factory HUs. I did read about the complications with the factory HU limiting the soundbar...even with the frequency cutoffs, I'm wondering if the boosted power would at least make the speakers serviceable.
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Old 04-20-2012, 01:50 PM   #4
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I actually installed one of these on a customer's vehicle a few days ago and I can tell you it is a quality amplifier.

It can be used as a high level (or speaker level input), or a low level input (RCA). I don't recommend using a factory radio with the amplifier but it IS able to be done and mounted directly behind the factory radio. I do recommend running a 12 or 14ga constant wire for this amplifier as it can draw up to 15amps of current. I wouldn't recommend wiring this into the factory radio harness 12v wire as it could overload that circuit and blow a fuse.

If you install this amplifier please do yourself a favor and read the huge poster sized pamphlet it comes with about tuning this thing. The proper way and the way they want you to do it is to turn the gain all the way down on the amplifier. Then turn up the volume on the radio being used to the point it starts to distort and then back it off a little so it is clear. After that is done, then turn up the gain on this new amplifier to the point of distortion and then back it off a bit.

The customer I installed this for was in an 05 Civic with Polk DXi 6.5" speakers... so I cannot speak for how it sounds in a Jeep. The sound quality and volume was very good. I am recommending this module to all of my customers if they are looking for an inexpensive way to upgrade their sound.
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Old 04-23-2012, 06:59 AM   #5
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How did you install this since crutchfield says it's not even available yet?
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Old 04-23-2012, 06:21 PM   #6
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How did you install this since crutchfield says it's not even available yet?
ktp-445u - BestBuy

I have sold 2 so far, and installed one of them. I have 3 more in transit to my shop.
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Old 04-23-2012, 09:19 PM   #7
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Quote:
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How did you install this since crutchfield says it's not even available yet?
KTP-445 - Alpine Head Unit Power Pack at Abt
In stock

Edit... sorry different amp...my bad
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Old 04-23-2012, 10:33 PM   #8
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awesome lil amp been installing alpine for about 6 years now and love the 445u have had great success with them in my shop
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Old 04-24-2012, 08:00 AM   #9
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Hmm, may grab one of these and some speakers and see if I can do it.
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Old 05-10-2013, 09:57 AM   #10
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I know this is an old post, but I am looking at this unit and it is looking more and more attractive for what I need. I plan on keeping the stock head unit and just add an in-line amp to boost the aftermarket Kicker speakers I upgraded recently. The JKU does not have the infinity system and it came with the 130n and Uconnect with iPhone connectivity. The look of the head unit does not bother me, but the lack of sound being pushed to the new speakers does. The sound is WAY clearer and the notes are actually clean now. That said, I really hate the idea of splicing the stock wiring as the car is still under warranty. I found this on the 'bay and wanted to know if anyone has tried this, or something similar to tie the system together.
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Old 05-11-2013, 09:07 PM   #11
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Originally Posted by Ephry73 View Post
I know this is an old post, but I am looking at this unit and it is looking more and more attractive for what I need. I plan on keeping the stock head unit and just add an in-line amp to boost the aftermarket Kicker speakers I upgraded recently. The JKU does not have the infinity system and it came with the 130n and Uconnect with iPhone connectivity. The look of the head unit does not bother me, but the lack of sound being pushed to the new speakers does. The sound is WAY clearer and the notes are actually clean now. That said, I really hate the idea of splicing the stock wiring as the car is still under warranty. I found this on the 'bay and wanted to know if anyone has tried this, or something similar to tie the system together.
I have the version of this amp that plugs and plays with an alpine HU. Love it. Provides just enough of a boost. Sits on the shelf just below the glove box.
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Old 05-15-2013, 10:16 AM   #12
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Thanks 370, did you have to splice the stock wiring? Just curious. I found a PAC that will (supposedly) be plug and play.
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Old 06-05-2013, 07:18 AM   #13
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My brother and I each have one in the glove box:




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Old 06-05-2013, 09:38 AM   #14
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Originally Posted by Ephry73 View Post
Thanks 370, did you have to splice the stock wiring? Just curious. I found a PAC that will (supposedly) be plug and play.
You will splice... no PAC will help unless you only have the base stereo and not the premium. If you have the premium, you will have to splice into the wires leaving the amp (not the radio) and heading to the speakers.
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Old 06-11-2013, 03:32 PM   #15
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Thanks for the reply. I do not have the premium, just the base 130n with Uconnect. I purchased the PAC and it basically connects to stock radio and wiring while giving me front and rear RCA outputs. This is what I will use to connect the Alpine Amp.
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Old 06-18-2013, 10:53 AM   #16
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does the amp get hot while sitting in the glove box? I put all my important documents/tire pressure gauge/sway bar disconnects in sandwich baggies that go into the glove box. Dont want to start a fire hazard
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Old 06-22-2013, 03:42 PM   #17
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Nopeeeeeee
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Old 06-25-2013, 08:50 AM   #18
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With the PAC I have CHR3 and the 445u I think my needs are covered. I even bought a Hideaway Kicker setup to put under the passenger seat. I can always unplug it if I take the doors off or go mudding.

E
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Old 07-07-2014, 10:30 AM   #19
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2013 JKU
Original System: non-Infinity, basic 6-speaker u130 without anything special (very crappy)
Goal: louder and cleaner sounding system that remains completely stock in appearance to deter theft

Parts:
Alpine KTP-445u ($129)
1x Metra 71-6522 (reverse) ($14)
2x Metra 70-6522 ($12 for both)
4x 6.5" Kicker CS65 ($69/pair)
Wal-Mart Pillow (polyfill) ($2)
Butt Connectors (lots) ($2)

Total investment: just under $300
Total time making harness, installing speakers and amp: ~8 hours (I might be slow...I'm a perfectionist so my time is likely longer than most).

Gotchas: Need to purchase speaker brackets or destroy existing speakers and use the old speaker surround as a bracket for the new speakers (needed on 3/4 speakers...passenger dash can be screwed to speaker box without bracket). I destroyed the existing speakers to use them as brackets...cheaper and they are garbage anyways.

Expectations: this is a suck experience IMHO. Have a few beers ready and lots of patience. You will be removing more screws than ever thought possible. Its recommended to COMPLETELY remove dash but my time was running low, so I figured out ways around this by pull dash back and squeezing in some tight spots (lots of tools and adapters to accomplish). I hate interior work!

I filled each speaker bay/box and soundbar with polyfill. If you're already in there...might as well! It's like $2 and WELL worth it...quality of sound and reduction of rattling.

I was able to install KTP-445u without cutting ANY factory wires (this was the goal). I made a harness from the three harness parts above to plug into the factory wiring harness and right into the factory stereo. I needed two of the 70-6522 due to it not having pins 1 and 13 (thanks for heads up someone else earlier posting this need...right on the money)...so I had to rip out pins from the 2nd unit and install it into the one I used for pins 1 and 13 (the purpose of the 2nd unit is for the spare wires only for steering wheel controls).

Installing the amp was basically plug-and-play after spending time building the harness. This ended up being the EASIEST part of the upgrade. The speaker output side of the amp is plenty long to install in glove box, but input sides are not...so I extended those and located to glove box. I plan to re-mount under the glove box soon.

I could share more if anyone needs...but lots of great info out there already.

Overall experience: as much as it sucked, I'd do it again. Sounds GREAT! Very clean/clear and loud. There's some decent bass response too...but now I need to dynamat my dash (or something) as the dash itself (lots of plastic) is quite loud when the speakers are providing any level of bass.

Hope this helps...Keep Calm and Jeep On! (or Chive On!)
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Old 09-11-2014, 11:17 PM   #20
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Do you know of a thread where this wiring is documented? Really liking the price and idea here. Exactly what I'm looking to do!
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Old 09-15-2014, 09:20 AM   #21
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Do you know of a thread where this wiring is documented? Really liking the price and idea here. Exactly what I'm looking to do!
My 89 wrangler has a short somewhere in the body I can't find. I thought it was the ignition switch cause it was burned out but there is still a hot going to ground. I have torn my hole dash apart trying to find it.

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