Our take on the Alpine MRP-M450

by Ken Nail

Outstanding audio performance — you expect it when the amp is an Alpine. Alpine's V-Power amplifiers supply the high level of performance you want without shaking loose too much of your hard-earned cash.

The MRP-M450 mono subwoofer amplifier will power your subwoofer with 220 watts of power. Add a second sub and the MRP-M450 pumps out 400 watts of power — enough to get almost any car shaking. The variable low-pass filter adjusts the frequency output to match your system, while the Bass EQ lets you dial in some extra boost on the lows. A subsonic filter eliminates inaudible, ultra-low bass notes for cleaner output.

The amp's machined-metal heatsink keeps the internal parts cool and distortion low even when you're cranking the volume. Gold-plated screw terminals and RCA connections resist corrosion that can degrade signal performance.

Highlights:

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 2-7/16"H x 9-9/16"D
warranty: 1 year
Our 60-day money-back guarantee

Note: Sorry, Crutchfield cannot ship Alpine products to Guam or Puerto Rico.

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and specs chart | What’s in the box? | In-depth notes

Features and Specs

Performance
RMS Power Output (Watts x Channels) Loading...	220 x 1
Peak Power Output (Watts x Channels) Loading...	---
Power at 2 Ohms (Watts x Channels) Loading...	400 x 1
Bridged Power (Watts x Channels) Loading...	---
Minimum Impedance Bridged Loading...	---
Minimum Impedance Unbridged Loading...	---
Best Frequency Response Loading...	20-200 Hz
THD at Rated RMS Power Loading...	1%
Signal to Noise Ratio Loading...	65 dB
Input Voltage Loading...	14.4v
Features
Amplifier Class Loading...	D
Low-Pass Crossover Frequency Loading...	50-200 Hz
Low-Pass Slope (dB/octave) Loading...	24 db
High-Pass Crossover Frequency Loading...	N/A
High-Pass Slope (dB/octave) Loading...	N/A
Bass Boost Loading...	0-12 db
Bass Boost Frequency Loading...	50 Hz
Fan Cooled Loading...	No
Fuse Rating Loading...	20 x 2
Speaker Level Inputs Loading...	Harness
Preamp Outputs Loading...	No
Width (inches) Loading...	9-3/4
Height (inches) Loading...	2-7/16
Depth (inches) Loading...	9-9/16
Parts Warranty Loading...	1 Year
Labor Warranty Loading...	1 Year

Product Research

What's in the box?

Download owner's manual

Mono amplifier
8" Speaker-level input harness (with 8-pin Molex plug on one end and bare wire on the other end)
2 Terminal covers
4 Self-tapping hex-head screws (M4 x 20)
4 Machine screws for securing terminal covers (M3)
Owner's Manual (English/French/Spanish)
Customer Care Registration card

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Features
Inputs and Outputs

Features

Power Supply: The MRP-M450 amplifier's power supply uses MOSFETs to convert DC battery voltage to the higher DC voltages needed for high power. It supplies positive and negative voltages around 0V, rather than around 6V as with conventional single-polarity power supplies. The result is higher power levels and a dynamic range wider by as much as 10dB.

Low Pass Filter: The amp is equipped with a 50-200Hz variable low-pass filter with a slope of 24dB/octave.

Subsonic Filter: This amp utilizes a 15Hz subsonic filter to eliminate super low frequencies that can rob power and damage speakers. The subsonic filter operates at all times, and cannot be turned off.

Bass EQ: The Bass EQ circuit provides a boost of 0-12dB at 50 Hz.

Inputs: The amplifier offers both line-level and speaker-level inputs for 2 channels. The supplied speaker-level input harness allows you to connect this amplifier to a receiver without preamp outputs, either aftermarket or factory.

Terminal Covers: The amp comes with two plastic covers that protect and insulates the RCA, power, and speaker connections. Four supplied machine screws attach the covers to the amplifier.

Inputs and Outputs

Left Side Of Amplifier:

GND (ground): Gold-plated terminal strip, 0.35" wide
Battery: Gold-plated terminal strip, 0.35" wide
Remote: Gold-plated terminal strip, 0.35" wide
Speaker Output: Gold-plated terminal strips for 1 speaker, 0.35" wide

Right Side Of Amplifier:

Line Inputs: 1 pair of gold-plated stereo RCA jacks
Speaker Level Input: Molex plug input for supplied 8-pin harness

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3 out of 5

Alpine MRP-M450

Written By , elkhart,IN on Thursday, October 14, 2010

I had this amp pushing a pair of Mtx 6000 thunders that are 250rms. And it sounded great. But I'm more of a deep breath takeing bass head my self so I hooked them up to a pair of 15 rockford P2. Now both the 10in Mtx's and the 15in rockford's are 250rms and 500peak. But the alpine could not keep the same constint bass with the 15's as it did with 10's so in all great amp for 10's. But not for 15's. Still good amp for the price..