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Alpine MRP-M450

Class D Monoblock Amplifier

Discontinued
|

We apologize

This item has been discontinued

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  • mono subwoofer car amplifier
  • 220 watts RMS x 1 at 4 ohms (400 watts RMS x 1 at 2 ohms)
  • variable low-pass filter (50-200 Hz, 24 dB/octave)
  • tuned Bass EQ (0-12 dB bass boost at 50 Hz)
  • subsonic filter (15 Hz, 24 dB/octave)
  • MOSFET power supply
  • CEA-2006 compliant
  • STAR Topology (minimizes internal noise and prevents ground interference)
  • speaker- and preamp-level inputs
  • gold-plated screw terminals
  • fuse rating: 20A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 9-3/4"W x 2-3/8"H x 9-9/16"D
  • 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.

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

220 watts x 1 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

400 watts x 1 channels
RMS Power @ 1 ohm

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 1 ohm, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

Not Stable
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

Not Bridgeable

Power Specifications - Subwoofer Channel

RMS Power @ 4 ohms
The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far. If the final impedance of your speaker(s) or subwoofer(s) equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
RMS Power @ 2 ohms
The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far. If the final impedance of your speaker(s) or subwoofer(s) equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
RMS Power @ 1 ohm
The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far. If the final impedance of your speaker(s) or subwoofer(s) equals 1 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
Peak Power Output
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage. Often times this maximum is achieved during a brief musical burst, such as a drum accent or low bass hit. Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. This is the peak power output for the amplifier's 5th channel.

Amplifier Specifications

Amplifier Series
This designates the series of the amplifier. Many amps are available in a litany of different wattage and channel configurations, but maintain consistent features throughout the product line.
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

D
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
1 - Mono
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

400 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
8 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Not Bridgeable
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
1%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Yes
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
No
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 200 Hz
Subsonic Filter
Allows you to block (filter) ultra-low frequencies that your subs cannot reproduce.
15 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
90 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 20 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
20A x 2 
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

Yes
Strappable
Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.

Specials with this Item

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Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
82%
4 Star
14%
3 Star
5%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
5.0
Features
4.6
Design
4.7
Usability
5.0

TypeC

red wing MN

Overall
Durability
Value
Features
Design
Usability

BEST AMP!!

September 1, 2011

This amp is so AMAZING!!! I have TWO of them pushing TWO 10" ALPINE type Rs in a sub zero vented box! You can't breath in my car!! My windshield wipers flex! My back seat flexes so much that I think it's gunna break off!! These amps are so nice!! And they stay so cool! Even when I bump for 3 hours streat! They get a little warm at the most!! I would recommend this amp to anyone looking for good sound quality and hard hitting bass for a good price!!

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k.o

everson wa

Overall
Durability
Value
Features
Design
Usability

awesome amp

March 18, 2010

i would definitely recommend this amp i used it to power my jl w6 and pounded the h*** out of that sub

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Derik

Mooresville, NC

Overall
Durability
Value
Features
Design
Usability

UNDERRATED

July 31, 2008

This thing is Great. Stays nice a cool, not too big, great power! im powering a JL Audio 12W3v3 off it and it bummmps like crazy. and the price is awesome on Sonic.

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Mark

Springfield, MO

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Value
Features
Design
Usability

Bump for your buck!

July 11, 2008

I recently had this amp paired with one 10" JL W3V3 sub and it has very nice hard hitting bass! I was worried that this sub would be too underpowered for the JL sub but it does the trick nicely and my rearview mirror is getting the earthquake treatment!!

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ben

Troutman, NC

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Value
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Design
Usability

nice amp!

May 15, 2008

i had this amp running to one alpine 12" e type and it preformed nicely!

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Jeremiah

Buellton, CA

Overall
Durability
Value
Features
Design
Usability

Can't Go Wrong With Alpine

December 20, 2007

I got the MRP-M450 from my local shop. I have it wired to 2 S-Types at 2 ohms in a custom Sonic sub enclosure. Unbelievable how well this little amp pushes two subs. AWESOME!

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Jonathan

M C B H Kaneohe Bay, HI

Overall
Durability
Value
Features
Design
Usability

Okay

December 20, 2007

I have this thing hooked up to a Rockford 10" P3D2 which can do 400 rms and 800 max in a sealed box sound comes from a eclipse cd 3000 all the wires are high dollar Rockford and I also have a cap wired in and it sounds like my sub is under powered but other than the power for me anyways its a good amp.

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mike

Concord, CA

Overall
Durability
Value
Features
Design
Usability

Good Solid Amp for mid level woofers

October 17, 2007

I power two 10" Infinity 1052w subs with this amp in a dodge ram and it sounds really nice. There is lots of power and easy to install.

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Chris

St George, UT

Overall
Durability
Value
Features
Design
Usability

Rockin Amp by E=Mc˛ St. George UT

September 28, 2007

Installed this Amp pushing a 12in Alpine Type S sub and I must say this thing is as good as any Cheep 1000 mono sub amp ... hands down the best 450w range mono sub amp on the market for under $200 Stays nice and cool!

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johnny

arcadia, CA

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Durability
Value
Features
Design
Usability

great buy for less

July 31, 2007

I bought this amp somewhere I cant say the name but its really popular. this amp went great with my jl audio 10w6 sub very old school but a goodie. didnt lose any wattage when i cranked it up and with hold alot of power specially when used with a capacitor ! ! ! . a must buy.

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brian

Temecula, CA

Overall
Durability
Value
Features
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Usability

get

July 19, 2007

for a single sub amp this amp would be the one to get this amp powers a good 12 inch sub and would be a good product for a single sub and good sound

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brandon

Huntingtonhuntington, TX

Overall
Durability
Value
Features
Design
Usability

THE BEST

July 13, 2007

The amp is very good it always out performed itself. I have it hooked to an Memphis SHP which requres an 1000.1 at 1 ohm to run correctly the Alpine runs it great but not to its full capablitly. over a very good amp

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Thomas

Crestwood, KY

Overall
Durability
Value
Features
Design
Usability

Great bang for your buck

July 13, 2007

My brother has this amp hooked up to a set of 12" mtx subs and they pound. He used to have a boss amp that was rated as twice the power of this map but this amp actually gives you the power they say they do. Not only is this amp louder but the clarity and sql is great. This is a great amp and you cant go wrong with alpine.

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brett

Torrington, WY

Overall
Durability
Value
Features
Design
Usability

wow

July 13, 2007

I bought this amp and hooked it up to a jl audio w 3 and man it hits harder than alot of systems i have heard. It's a great amp for the price

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roderick

fort worth, TX

Overall
Durability
Value
Features
Design
Usability

Very Good Amp

July 13, 2007

I recommand this amp to those whom enjoy good sounding,and powerful amps.Cant go wrong with alpine.

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Simon

Hays, KS

Overall
Durability
Value
Features
Design
Usability

Great AMP

March 1, 2007

Hooked this amp to a 12" audiobahn and man does it thump hard. If you want the best bang for your buck don't fool around with other amplifiers.

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Jason

Spring, TX

Overall
Durability
Value
Features
Design
Usability

This is real nice!

December 28, 2006

I bought this amp to push 2 12" Apline type E's. They bump like no other. I was very impressed with the crisp, clean sound of this amp. I HIGHLY recommend this amp.

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frank

Murfreesboro, TN

Overall
Durability
Value
Features
Design
Usability

Alpine MRP-M450

November 1, 2006

This amp is very powerful. I'm running 2 Kicker 12" in a bandpass box. I've tried to make it cut off but it just won't do it. My other amp would cut off if I passed a certain level, but this one is very strong. I'm not one bit dissapointed in this amp. I love it soo much, i'm recommending it to all of my friends!

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chris

Chesterton, IN

Overall
Durability
Value
Features
Design
Usability

all aroundgood amp

September 8, 2006

i had this amp pushing two 12 inch rockfard phase two's, and it BUMPED. I recomend this amp to anyone that wants some knock in their trunk but still wants room for other things.

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Kevin

Colonial Heights, VA

Overall
Durability
Value
Features
Design
Usability

Good Amp

July 28, 2006

I purchased this amp along with two 12" Alpine Type E series subs. I have a Pioneer DEH 4800 pushing the factory speakers in my explorer with the amp pushing the 12s in the back. The whole system sounds really good. I can turn it up and there is no distortion at all. The bass is not muffled and sounds good. I am very pleased with my purchase. You will be too.

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Accessory Tools and Products

Accessories added

Stinger SK4681 8-Gauge Wiring Kit

You only get great sound when you use great wire. This Stinger kit will do the trick!

Your Price $39.99

Belva BAK82

Complete 8 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects

Your Price $17.99

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $79.99

Kicker Big 3 Package 1/0 Gauge Big 3 Upgrade Kit

Get all you need including wire cutters to upgrade your power and ground wire.

Your Price $149.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

Your Price $7.99

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

StreetWires FB4

4 AWG / 4 Gauge Firewall Bushing

Your Price $6.95

NVX XDBU4 - Top of the Line!

Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

Kicker KI24 K-Series RCA Audio Interconnect Cable

4 Meters (13 ft.) 2-Channel K-Series RCA Audio Interconnect Cable

Your Price $16.95

NVX XIV25 V-Series 2-Channel RCA Cable

16.4 ft of V-Series 2-Channel RCA Audio Premium Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $11.99

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $13.99

Belva BBSW127 12 AWG Speaker Wire

12 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $14.99

Belva BBSW167 16 AWG Speaker Wire

16 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $12.99

The Install Bay IB-CAP1F

True 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $37.99

e2 ECAP1 by Scosche - Mid-Level 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $49.99

Rockford Fosgate RFC1D - Top of the Line 1 Farad

Digital 1.0 Farad Car Audio Capacitor for up to 1000W Max

Your Price $104.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

AutoSound 2000 CD-102

High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.

Your Price $11.99

AutoSound 2000 CD-104

Audiophile reference series test disc for evaluation of all audio components.

Your Price $11.99

Product Summary

Manufacturer

Model Number

MRP-M450

Weight

10.00lbs

Internal SKU

mrpm450

Internal Product ID

6470

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Alpine MRP-M450