- 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 4.6 out of 5 stars:
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Average Attributes Rating:
| Durability | | 4.6 |
| Value | | 4.4 |
| Features | | 4.1 |
| 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
Lee from Zachary,LA
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I was trying to choose which way I wanted to go with my highs in my 1998 Lincoln Navigator. And I choose to go with the KTP-445. At first I was wondering would this be enough power and after I installed it. I felt in love with it.
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Review by
Michael from Jeffersonville, IN
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First of all, the reason for having this amp is not to hear a volume increase it is to protect your speakers from the possibility of destruction. Generally the radio's built in amplifier is about 18W RMS. To get a just noticible increase in sound volume to the human ear you have to DOUBLE that amount of power. So 18 x2= 36W RMS. To get the next just noticable increase you have to double the power again (36 x 2= 72W RMS) and so on. Each doubling of power is a 3dB increase. The radio volume should NEVER be turned up past 11 0'clock position because distortion is introduced (Clipping of the sine wave peaks). This clipping results in DC applied to the speaker coil and could easily fry it even for short periods of time. The additional booster amp like this one just allows you a bit of "amplifier headroom" so you will not clip the sine wave and thus protect your speaker investment.
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