Sound Ordnance M-4100

4-channel car amplifier — 100 watts RMS x 4

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Item# 777M4100

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Overview
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Customer Reviews
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Accessories

My system has plenty of power. Who needs an amp?

You might think you don't need an amp because you have a 400-watt system in your car, or because your new stereo puts out 50 watts a channel. But those are peak wattage ratings, which may boil down to 15 or 20 watts per channel, using the more realistic RMS rating. An amp sends your speakers the power they need to deliver your music with clarity and impact, whether you're using factory speakers or high-performance components. And low-frequency reproduction requires lots of power, so an amp is an absolute must if you're adding a sub to your system.

Our take on the Sound Ordnance™ M-4100

by Buck Pomerantz

Win the battle for great sound in your ride. Sound Ordnance amplifiers feature tough construction, rugged looks, and a 3-year warranty, so you can enjoy the full power of your music for the long haul. Even better, you can add Sound Ordnance to your arsenal at a surprisingly affordable price.

The Sound Ordnance M-4100 4-channel amplifier deploys 100 watts RMS to each channel, giving your music plenty of firepower. You can also bridge the amp to 2-channel mode to mobilize a pair of subs with 270 watts RMS each, or send 270 watts to a sub while the front channels run your full-range speakers. An adjustable high-pass filter makes sure your full-range speakers operate within their optimum range and give you the best tone possible. If you're driving a sub, the low-pass filter and variable bass boost allow you to control your bass barrage at will.

The M-4100 amplifier uses sophisticated power supply and output technologies to ensure clean amplification from the inputs all the way to your speakers. Special circuits protect the amp from overheating and short circuits, and a turn-on delay virtually eliminates that annoying thump when you turn your system on.

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Highlights:

4-channel car amplifier
100 watts RMS x 4 at 4 ohms (135 watts RMS x 4 at 2 ohms)
270 watts RMS x 2 bridged at 4 ohms (4-ohm stable bridged)
variable high-pass filter (15-250 Hz, 12 dB/octave)
variable low-pass filter (60-200Hz, 12 dB/octave)
variable bass boost (0-18 dB at 45 Hz)
PWM (pulse width modulation) power supply with MOSFET output
preamp inputs
fuse rating: 40A x 2
4-gauge power and ground leads recommended — wiring and hardware not included with amplifier
17-5/16"W x 2-1/8"H x 9-13/16"D
warranty: 3 years
Our 60-day money-back guarantee

Shop all Sound Ordnance Car Amplifiers

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...	100 x 4
Peak Power Output (Watts x Channels) Loading...	143 x 4
Power at 2 Ohms (Watts x Channels) Loading...	135 x 4
Bridged Power (Watts x Channels) Loading...	270 x 2
Minimum Impedance Bridged Loading...	4
Minimum Impedance Unbridged Loading...	2
Best Frequency Response Loading...	12-25k Hz
THD at Rated RMS Power Loading...	1%
Signal to Noise Ratio Loading...	88 dB
Input Voltage Loading...	14.4v
Features
Amplifier Class Loading...	AB
Low-Pass Crossover Frequency Loading...	60-200 Hz
Low-Pass Slope (dB/octave) Loading...	12 dB/oct
High-Pass Crossover Frequency Loading...	15-250 Hz
High-Pass Slope (dB/octave) Loading...	12 dB/oct
Bass Boost Loading...	0-18 dB
Bass Boost Frequency Loading...	45 Hz
Fan Cooled Loading...	No
Fuse Rating Loading...	80
Speaker Level Inputs Loading...	No
Preamp Outputs Loading...	No
Width (inches) Loading...	17-5/16
Height (inches) Loading...	2-1/8
Depth (inches) Loading...	9-13/16
Parts Warranty Loading...	3 Years
Labor Warranty Loading...	3 Years

Product Research

What's in the box?

Download owner's manual

4-Channel amplifier with two 40A ATC blade fuses inserted
Spare 40A ATC blade fuse
4 Self-tapping screws (5/8" length)
4 Split lock washers
4 Flat washers
Owner's Manual

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
Connections

Features

Power Ratings: The Sound Ordnance M-4100 is a four-channel Class AB amplifier with an RMS power rating of 100 watts per channel into 4 ohms, and 135 watts per channel into 2 ohms. The amp can also be bridged into a 4-ohm load for a power rating of 270 watts (x 2). Power ratings are measured with an input power of 14.4 volts.

Crossovers: The M-4100 is equipped with both high-pass and low-pass crossovers. The front channels (channels 1 and 2) and the rear channels (channels 3 and 4) have separate crossovers. You can set the low-pass cutoff frequency between 60Hz and 200Hz, and the high-pass cutoff frequency between 15Hz and 250Hz. Separate 3-way switches let you select low-pass, high-pass, or full range operation independently for the front and rear channels. The crossovers have a 12dB per octave slope.

Bass Boost: The amplifier has separate bass boost controls (labeled Bass EQ on the amp) for the front and rear channels. Each rotary control is continuously variable from 0dB to +18dB and boost is centered at 45 Hz.

LED Indicators: The M-4100 features two LED indicators: a green LED that illuminates when the amp is powered on, and a red LED that illuminates when the amplifier is in protect mode due to overheating or a short circuit in the speaker wire.

Connections

Removable End Caps: The end caps on the M-4100 are removable with a 3mm Allen wrench (not supplied) to make it easier to attach the power and speaker wires.

Power Connections: The power and ground connections are set screw terminals that will accommodate up to 4-gauge wire. (A 4-gauge amplifier wiring kit is recommended.) The remote turn-on terminal is a set screw terminal that will accept up to 8-gauge wire. A Phillips-head screwdriver (not supplied) is required to tighten/loosen the terminals.

Speaker Connections: The speaker connections are set screw terminals that will accommodate up to 8-gauge wire. A Phillips-head screwdriver (not supplied) is required to tighten/loosen the terminals.

RCA Inputs: The amplifier features two pairs of stereo RCA inputs for connecting your head unit--one pair for the front channels and one pair for the rear channels. If your head unit only has one pair of preamp outputs, you can feed all four amplifier channels with one pair of RCA plugs. (You will lose front-to-back fader capability if you connect the amplifier with one pair of RCA plugs.) The Input Mode switch allows you to select 4-channel or 2-channel inputs. The amplifier does not have preamp outputs.

Fuses: The M-4100 features two 40-amp ATC blade fuses.

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Reviews for the Sound Ordnance™ M-4100

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4 out of 5

Awesome Amp

Written By Elliott B, Fair Lawn, NJ on Thursday, May 02, 2013

Crutchfield Customer Review (What's this?)

I love the amp its very good for the price you wont find anything that powerful, I did read the reviews before I bought it and I made sure that I put it in my trunk UNCOVERED because the biggest problem that everyone has seen with it is how ht it gets. All in all, if you install correctly and tune it properly you will have a great working amp for your system.

Pros:

PRICE, POWER

Cons:

HEAT

Was this review helpful? Yes | No

5 out of 5

Nice amp

Written By Mike, Kyle TX on Thursday, April 25, 2013

Crutchfield Customer Review (What's this?)

So far so good. They sound good, has crossover controls. Looks nice in the truck

Pros:

Good sound

Cons:

HEAVY! Sometimes the connectors don't always grab the wire.

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4 out of 5

I like it very much!

Written By Rafael Siria, Los Angeles Ca on Saturday, January 12, 2013

Crutchfield Customer Review (What's this?)

I like Sound OrdnanceT M-4100 because sound superior of my old amplifier.

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5 out of 5

Great amp

Written By eyeless, ypsi, mi on Monday, January 07, 2013

Crutchfield Customer Review (What's this?)

I bought this amp to run my 4 infinity kappa 682.9cf speakers and it does a great job. No complaints yet

Pros:

powers my 4 speakers with no problem

Cons:

none

2 out of 2 people found this helpful

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1 out of 5

Not Impressed

Written By Bruce, Suffield, CT on Sunday, December 23, 2012

At first this amp seemed to sound and work well. After a few months, the amp started running real hot, to the point of shutting itself off. i was only driving the amp maybe 60% of its capability. I put up this because for the most part it worked and I only had to shut the system off for 5 minutes or so and turn it back on. After a year, a set of channels burned out, reducing the amp to 2 channel system.

Pros:

Price

Cons:

Instable, high heat, mediocre quality after a year burned out channels.

3 out of 3 people found this helpful

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5 out of 5

Written By Mike T, Palmyra, NJ on Thursday, September 27, 2012

Crutchfield Customer Review (What's this?)

This amp not only looks cool but sounds amazing. Lots of EQ and very powerful. A bit long but under the seat so doesn't matter.

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4 out of 5

Written By CalmC, Alexandria, VA on Sunday, October 09, 2011

Crutchfield Customer Review (What's this?)

The amp works well, it does require some searching to find a good place to stash it, but it fits almost perfectly under my rear seats so I don't lose any storage space to it. Only downside to it that I've noticed is a large parasitic draw when the car is off. With the amp connected the car draws 1.0 amps when off, 30 milliamps is about the most you want for a parasitic draw. With the amps inline fuse yanked the car draws about 5 milliamps, since it has no security system. Meaning that I have to yank the fuse or the battery is dead if I leave it sitting for more then a day.

4 out of 5 people found this helpful

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5 out of 5

Very Happy

Written By Wayne, TN on Thursday, October 06, 2011

Crutchfield Customer Review (What's this?)

Great amp at a great price. Works very well to run four 100watt Polk 6.5momos. Very easy install with great customer support. Crutchfield is awesome.

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5 out of 5

Sound Ordnance™ M-4100

Written By Bryan R, Kingsport TN on Tuesday, October 04, 2011

Crutchfield Customer Review (What's this?)

This amp was very reasonably priced, It preformed much better than I expected!!!! Really brought speakers to life!

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4 out of 5

Good except for plastic & heat

Written By stever761, Spicewood, TX on Friday, June 24, 2011

Crutchfield Customer Review (What's this?)

I've had it in my truck for about 2 months now. I've been pretty satisfied with the performance so far. The footprint is hard to work with. Luckily I have a place under my rear seat in my Tundra DoubleCab. The length is very long for something you install in a vehicle and it generates a lot of heat. The vents are on the bottom and I've had issues on long trips where it overheats and shuts down. I flipped it over so that I now have the vents on top. The end caps where the mounts are located to secure the amp are plastic. I broke off both mounts on one end trying to secure it even though I had read the problems in other reviews and tried to be careful. The rest of this is pretty high quality, but that is one area where the ball was dropped. This is kind of heavy and in a major collision not having it secured properly could be a big hazard. Ditch the plastic chrome and use a metal mount that is incorporated in the amp chassis. I like the angled inputs to the wiring which makes it easier to access when you are trying to work in tight spaces with limited visibility. I also like that you use a philips screw instead of a flat head or allen wrench. The controls are easy to use, though the manual is lacking in more detail on the best ways to adjust them. It wasn't totally clear what each control did or how best to customize the sound. Performance-wise, I have no complaints. It puts out good clean sound.

4 out of 4 people found this helpful

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4 out of 5

2nd attempt

Written By joshua, miami on Monday, April 18, 2011

Crutchfield Customer Review (What's this?)

At first the first one didn't work and was defective. Talked to a supervisor and him
along with a technical operator we had an rma sent out immediately. New one
works great. Only Con I have is the heat vents are at the bottom so if it does heat
up its are to have air escape when mounted. Power is clean and powerful. Thx for
all the help with this.

1 out of 1 people found this helpful

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1-20 of 25 >>

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Rated 5-stars by consumers

For a more in-depth review and enhanced detailed information on the Sound Ordnance™ M-4100, please visit the Crutchfield website product page (/S-NvQQCOB48ja/p_777M4100/Sound-Ordnance-M-4100.html ).

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Sound Ordnance™ M-4100

4-channel car amplifier — 100 watts RMS x 4

$135.99

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Sound Ordnance M-4100

4-channel car amplifier — 100 watts RMS x 4

Item# 777M4100 offer details

Review Summary

By buying this product you'll earn up to 136 Rewards points.

My system has plenty of power. Who needs an amp?

Our take on the Sound Ordnance™ M-4100

by Buck Pomerantz

Highlights:

Shop all Sound Ordnance Car Amplifiers

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

Features and Specs

Product Research

Our Product Research Team

Features

Connections

Product Reviews

Reviews for the Sound Ordnance™ M-4100

Average Customer Review:

Review this product:

Crutchfield Video Review Guidelines

Filter by rating:

Awesome Amp

Nice amp

I like it very much!

Great amp

Not Impressed

High quality at a fair price

2 amps, 2 returns...

Great Amp

S.O. M-4100 amp

Crisp & Clean with ample power

Great Budget Amp

Good for the price

M4100- Awesome AM

Sound OrdnanceT M-4100

Good Bang For The Buck!!

Sound Ordnance™ M-4100

Very Happy

Sound Ordnance™ M-4100

Good except for plastic & heat

2nd attempt

Accessories

Add accessories for the Sound Ordnance™ M-4100

You'll need an amp wiring kit to install your new amplifier, as wiring is not included. See all categories & accessories

Smart people protect with SquareTrade- The best warranty at the best price

Your featured item

Single-amp Wiring Kits

Speaker Wire

RCA Patch Cables

Firewall Bushings

Fuses