- Alpine Power Pack 4-Channel Class D for Select In-Dash Receivers
- Increases the output of an Alpine headunit without having to install a full size amplifier and amp install kit
- The fast and easy solution to higher power aftermarket sound
- RMS Power Rating:
- 4 ohms: 45 watts x 4 chan.
- Total RMS power output: 180 watts
- Gain switch is adjustable from high to low
- Plug-and-play design for compatible Alpine headunits
- Plugs directly into the wiring harness of the Alpine receiver
- Fast and simple installation
- 4 channel operation for four speakers
- Minimum impedance of 4 ohms
- Is not compatible with factory amplifiers
- CEA-2006 compliant amplifier
- Frequency response: 20-20,000 Hz
- Fuse Rating: 15A x 1
- Dimensions: 7-13/16D x 2-9/16"W x 1-1/2"H
- 1-year SonicElectronix.com warranty
Alpine products are warranted solely by Sonic Electronix, Inc. under the same period and terms as the original Alpine warranty. Sonic Electronix is not an Authorized Alpine Dealer and Alpine requires all merchandise purchased by Sonic Electronix customers to be returned solely to Sonic Electronix. Alpine products are also covered by our Standard Return Policy for returns on exchanges or refunds within 30 days from the date of purchase.
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Average Customer Rating is 4.5 out of 5 stars:
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Average Attributes Rating:
| Durability | | 4.5 |
| Value | | 4.3 |
| Features | | 3.9 |
| Design | | 4.4 |
| Usability | | 4.6 |
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Most Helpful Customer Reviews:
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Review by
Randy from Conway, AR
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I've been a mobile electronics installer for nearly 30 years. The KTP-445 is a nice amp, but the buyer should be aware of its purpose. This amp is not designed to run subwoofers. Its primary use is to improve the response and lower distortion of four typical full-range speakers. Used with modern Alpine head units, it is a simple plug-in installation. Just unplug your radio at the back, plug one harness back into the radio and the other into the harness you removed. That's it! The amp is so small, it will fit behind most radios or under the dash. There's a fair amount of harness to make it easier to locate. You aren't going to experience a great deal more of volume. Remember, practically all head units today already output from 18-23 watts per channel, so this amp is only about twice that and you don't add that to the radio's power, you REPLACE it. Doubling power gives you only about 3 decibels more volume, barely detectable to the human ear.
Finally, notice that this amp DOES NOT have RCA inputs. It can be wired to other brand radios, but you need to know what you're doing: Not advisable for the novice.
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Review by
Ace from Canada, BC, Canada
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I just bought this, Maybe I should take it back! My Alpine CDA-105 sounds a little better without the KTP-445 installed. Others may have luck with this little amp but not me. Well i guess it sounds about the same as my CDA-105 hooked up straight to the speakers. It doesn't sound like 45 watts RMS, more like 25W RMS x4!
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Review by
Nick from Cedar Rapids, IA
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First of all, i dont quite hear much of a difference or increase in my sound quality or power. maybe a little, but not much. kind of made me mad that i spent 110 bucks for my CD player not to distort a couple more volume levels. i guess that's why they make 4 channel amps. would not recommend unless you really don't want to put a 4 channel amp together. its kind of hard to fit behind your CD player too with all the wires. but on the other hand. it does sound good!
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Review by
Paul from Chicago, IL
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What I like: It's dummy proof. Plug n play. 1 switch for low/high on the back.
What I don't like: Lots of wires, and still bulky. You need a lot of room to hide it.
What could have been done better: Remote for the switch because you will have to get behind the radio or wherever you mounted this to change from low/high. And some wire loom to make it easier to fish the wire.
Other thoughts: it works well, paired with kenwood components and alpine cde-126bt. Volume cranked to 24 and it screams. Without this the volume would have to be at 26 for the same sound. So it does work, well it's meh/ok. The headunit has decent output as it is so if you have a crap headunit it's worthwhile. It is worth the price.
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Review by
Buc Nasty from Detroit
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For someone with an Alpine head unit that wants a little more volume but does not want to aliens the cash on an amp kit and rca's, not to mention labor out the extra cost of a conventional four channel amp, this thing does pretty well. I had this in my ride and it did a nice job. Not a ton of features, but of the head unit had cross over ability and you have reasonable expectations for this, it is a great convenient low cost option to improve your sound system.
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