Sound Ordnance M-4050

4-channel car amplifier — 50 watts RMS x 4

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Item# 777M4050

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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-4050

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-4050 4-channel amplifier deploys 50 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 180 watts RMS each, or send 180 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 selectable bass boost allow you to control your bass barrage at will.

The M-4050 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
50 watts RMS x 4 at 4 ohms (90 watts RMS x 4 at 2 ohms)
180 watts RMS x 2 bridged at 4 ohms (4-ohm stable bridged)
variable high-pass filter (120-3,000 Hz, 12 dB/octave)
variable low-pass filter (50-250 Hz, 12 dB/octave)
selectable bass boost (0, 6, and 12 dB at 45 Hz)
PWM (pulse width modulation) power supply with MOSFET output
preamp inputs and outputs
fuse rating: 20A x 2
8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
14-1/8"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...	50 x 4
Peak Power Output (Watts x Channels) Loading...	94 x 4
Power at 2 Ohms (Watts x Channels) Loading...	90 x 4
Bridged Power (Watts x Channels) Loading...	180 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...	96 dB
Input Voltage Loading...	14.4v
Features
Amplifier Class Loading...	AB
Low-Pass Crossover Frequency Loading...	50-250 Hz
Low-Pass Slope (dB/octave) Loading...	12 dB/oct
High-Pass Crossover Frequency Loading...	80-2k Hz
High-Pass Slope (dB/octave) Loading...	12 dB/oct
Bass Boost Loading...	0, 6, 12 dB
Bass Boost Frequency Loading...	45 Hz
Fan Cooled Loading...	No
Fuse Rating Loading...	40
Speaker Level Inputs Loading...	No
Preamp Outputs Loading...	1 pair
Width (inches) Loading...	14-1/8
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 20A ATC blade fuses inserted
Spare 20A 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-4050 is a 4-channel Class AB amplifier with an RMS power rating of 50 watts per channel into 4 ohms, and 90 watts per channel into 2 ohms. The amp can also be bridged into a 4-ohm load for a power rating of 180 watts (x 2). Power ratings are measured with an input power of 14.4 volts.

Crossovers: The M-4050 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 50Hz and 250Hz, and the high-pass cutoff frequency between 80Hz and 2 kHz. Separate switches let you select low-pass, high-pass, or full range operation for the rear channels, and high-pass or full range for the front channels. The crossovers have a 12dB per octave slope.

Bass Boost: The amplifier has a bass boost switch, labeled Super Bass, to give small subwoofers more volume in the low frequencies. You can select the amount of boost with the 3-way switch: 0dB, 6dB, or 12dB. The Super Bass feature is available for the rear channels only.

LED Indicators: The M-4050 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-4050 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 8-gauge wire. (An 8-gauge amplifier wiring kit is recommended.) The remote turn-on terminal is a set screw terminal that will also 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 and Outputs: 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 by connecting optional Y-adapters. (You will lose front-to-back fader capability if you connect the amplifier using Y-adapters.) There is also a pair of stereo RCA outputs for feeding the preamp signal to another amplifier, if needed.

Fuses: The M-4050 features two 20-amp ATC blade fuses.

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Reviews for the Sound Ordnance™ M-4050

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5 out of 5

Bang for the Buck

Written By TomB, Amity, PA on Wednesday, May 22, 2013

If you are on a budget, but do not want budget sound...You will want this amp. I just finished the install in my 1998 Jeep Cherokee today. Kenwood headunit, this amp, 35watt RMS Pioneer speakers in front doors, an a 10" Kicker Comp in a truck box mounted behind front seats. I had a similar setup in a Cherokee that I owned previously, the only difference being the amp. My budget this time around was limited, even though my install space was not. It is a big amp..yes....well worth the money?? Absolutely!!! My sister has been tossing around the idea of me installing a system in her Focus and my Jeep just put the final nail in the coffin on that decision. She thought Amps and Subs were for noise you can hear around the block. This setup is so crystal clear and POWERFUL!!! The 180watts going to the sub (with two channels bridged) is no bull. My old system used a 4 channel Kenwood 800watt amp bridged going to the same kind of box and It cant even be compared. I put in a CD of my sisters (Kenny G's Titanic sound track) and the sound quality between the crystal clear highs and seat vibrating bass made my hairs on my neck stand on end. And that is not my kind of music. WOW..that is all I have left to say...WOW... Long review, but I want folks to know that $100 plus change can really get you a fine amp for your ride. Thanks Crutchfield!!

Pros:

Outstanding power. Nice layout of connections and adjustments...makes for a clean/easy install

Cons:

Are you kidding me?? Umm.....I didn't buy one sooner?? Yes..it sounds that good!!!

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5 out of 5

Excellence in Both Product and Sound

Written By DaveJ, Midlothian, VA on Tuesday, May 21, 2013

Crutchfield Customer Review (What's this?)

This unit is manufactured very well. The connectors are solid, the surround is solid and controls are excellent. The sound is unbelievable! Rock the JEEP!

Pros:

Great construction, easily installed and mounted.

Cons:

Need some additional mounting aids or points

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5 out of 5

Astounding!

Written By Jimmy, Florida on Monday, May 20, 2013

I was astounded at how good my new M4050 sounds for the price! II bought my M4050 last week to replace another older different brand amp that had problems. My old amp was heavier and had a smaller chassis but the M4050 sounds 100% better, has plenty of power and the sound is absolutely crystal clear. I have the front channels connected to 2 pair of Kicker KS60 coaxials and a pair of older Alpine Type R tweeters, and bridged the rear channels to a single 10" Alpine SWE 10" sub in a sealed enclosure. I have put my system through some testing since I installed my M4050 last week and it hardly even gets warm, even after 30 minutes of continuous loud volume. My whole system sounds great, both at high and low volume. When I found out Sound Ordnance is Crutchfield's "house brand" I knew it was a good amp because Crutchfield would not put their name or reputation on a bad product. These Sound Ordnance amps sound fantastic and you just can not beat the price. I will 100% recommend Sound Ordnance to anyone who needs a great amp at a budget price. My M4050 is without a doubt the best inexpensive 4 channel amp I have ever heard. It sounds every bit as good as other amps at 2 or 3 times the price. These Sound Ordnance amps are an excellent sounding amp with plenty of power at a great price. Thanks again Crutchfield!

Pros:

Great sound, crystal clear mids and highs and plenty of power for subs. The amp looks good too. Seems to perform perfectly and not get hot at all. even with both front and rear channels running at 2 ohms.

Cons:

I would prefer a variable bass boost knob or potentiometer instead of a fixed 0, 6 or 12 db bass boost, but that is a very minor issue. The amp is a bit large, but I had room for it. Some have said the plastic mounting brackets break, I could see how that might happen, so it is best to pre-drill mounting holes and run the screws in by hand or a long shank Phillips bit on a cordless drill but be sure to use a drill with a clutch set about in the middle to avoid damaging the brackets.

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5 out of 5

great

Written By rob, lincoln on Friday, May 03, 2013

Crutchfield Customer Review (What's this?)

Great sound, easy to install and adjust. The sound is really impressive for the price. I bought this to replace a Rockford Fosgate 4 channel amp that cost 4 times the price and it sounds just as good.

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5 out of 5

Awesomeee

Written By Gf, Doniphan, Missouri on Saturday, April 27, 2013

It's so wonderful I told my friends about it and this place

Pros:

Everything you need in this amp

Cons:

Nothing wrong

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5 out of 5

Sound Ordnance M-4050

Written By DaveW75, Tujunga, Ca on Wednesday, March 20, 2013

Crutchfield Customer Review (What's this?)

Pros:

Great sound, solid performing amp.

Cons:

The side covers are plastic and held onto the unit by 2 allen screws. It is a little annoying trying to attach them after wiring up the amp. I had a difficult time tightening the mounting screws with the cover on.

1 out of 1 people found this helpful

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5 out of 5

Great amp

Written By Kevin, Greenville, NC on Friday, December 28, 2012

Crutchfield Customer Review (What's this?)

Great amp for the price!

Pros:

Lots of configuration options. Great power and easy to use.

Cons:

A little larger than some other amps.

1 out of 1 people found this helpful

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5 out of 5

Sound OrdnanceT M-4050

Written By TZ, Michigan on Friday, December 07, 2012

Crutchfield Customer Review (What's this?)

It definitely improved the quality over a stock GM unit and for the money it is a good investment

Pros:

low price good quality equipment

Cons:

none really it seems to be a good deal for the price

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4 out of 5

Plenty of Power

Written By Alek, Grand Rapids, MI on Monday, November 12, 2012

Crutchfield Customer Review (What's this?)

This amp has plenty of power to drive my Polk db501 front speakers and my Infinity Kappa 693.9i rear speakers. As many have said, the plastic mounting frame feels weak, but it did not break when I screwed it down to the box, so there's that.

A strange note, when screwing down the positive power terminal (onto wire that was NOT yet connected to a power source) my screwdriver arced to the metalicized plastic frame. I checked the fuses, and one of them had blown. I haven't noticed any indication of damage in terms of sound quality, but it was quite surprising and a bit disconcerting.

Pros:

Powerful, clean sound Affordable

Cons:

Plastic Mounts feel Weak and Cheap

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5 out of 5

Crystal Clear

Written By JakeW, Buffalo, MO on Sunday, September 09, 2012

Hesitant at first, but when I discovered SO was Crutchfields house brand, I knew it had to be good. Couldn't be anymore pleased with this amp. I am running the highs through this amp, they are crystal clear and powerful.

Pros:

It's all good.

Cons:

None

1 out of 1 people found this helpful

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3 out of 5

First time buyer

Written By Bill, Lake Jackson, tx on Tuesday, July 10, 2012

Crutchfield Customer Review (What's this?)

This amp was an easy installation and work well with the new JBL speakers that were installed in the door, the price was at the low end but the sound is on the high end. I also purchase a JVC radio with an HD tuner which sounded greate.

Pros:

Great sounding and a good match for the speakers purchased.

Cons:

Amp runs a little hotter than i exspected.

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5 out of 5

Just what I needed at a good price

Written By MikeE, Cave Springs, AR on Sunday, May 20, 2012

Crutchfield Customer Review (What's this?)

I was looking for a reasonably-priced amp to power two 6-1/2 speakers plus a 10" sub and this fit the bill perfectly. The built-in high-pass and low-pass filters are just what I needed. As others have mentioned, this amp is pretty big, but I put it in a 32' RV so room wasn't a concern.

Pros:

Nice features at a good price.

Cons:

It may be a little too big for some applications.

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4 out of 5

Great sound!!

Written By Randall, Aurora, Co on Tuesday, March 20, 2012

Crutchfield Customer Review (What's this?)

I got this amp for my Jeep..hits under the back seat. makes my speakers sound great..I have a 10'' sub & 5 1/4 hooked up. bridged the sub so it has 180 watts & 50 watts to each of my 5 1/4 sounds great!! Makes my sub bump but I can still hear the words from my other speakers just fine. I was alittle worried about not being able to hear the words having a Jeep Wrangler..But it sounds better then I thought it would!!

Pros:

Price,sound quality,bass boost,allows you to hookup two subs or one sub & 2 other speakers or 4 smaller spearks.

Cons:

None

1 out of 1 people found this helpful

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4 out of 5

SO M-4050

Written By Zach, Ohio on Saturday, February 25, 2012

Crutchfield Customer Review (What's this?)

This is a nice amp for the money, it feels very durable when you are holding it. It has never come close to getting hot or even very warm. It was very easy to set up, everything is labeled well. Crutchfield's tech support is awesome, they were very helpful.

The only thing i would say is bad is the size. I wouldn't even consider it a bad thing really, just if your trying to conserve space it is a bit bigger than other amps of the same power. It doesn't really matter to me because my subs already take up the whole trunk so i'm not going to be putting anything else in there anyways haha

Pros:

good quality, doesn't overheat, labeled well, terminals are easy to use/switch wires etc

Cons:

i little bit big

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4 out of 5

Big sound, big amp

Written By A. Hennessy, Boston, MA. on Thursday, February 23, 2012

Crutchfield Customer Review (What's this?)

Probably the best upgrade I made to my system. Easy set up and Crutchfield even helped with the crossover settings when I called tech support. Songs that you have heard thousands of times sing with detail that you have never heard before. If you listen to a lot of music in your ride it is worth the price to upgrade the sound. The only drawback was the size of the amp, it is big compared to other similarly powered amps. If you have to install this in a tight area it might make adjustments a pain. I have bought several Sound Ordnance products and they were well worth the investment. Life is too short to listen to lousy fidelity.

Pros:

Great sound, very loud, very reasonably priced. Great tech support.

Cons:

Very big, whats up with the dog tags?

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1 out of 5

Ok when it's warmed up.

Written By Jack, Mission Viejo CA on Saturday, January 28, 2012

Crutchfield Customer Review (What's this?)

This amp works well once it gets warmed up but for the first five minutes of driving all I hear is a loud rumbling noise even with the source turned all the way down.

Pros:

Looks nice and good sound.

Cons:

Needs to warm up before clean sound comes.

2 out of 8 people found this helpful

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3 out of 5

SO M 4050 amp

Written By Jeremy, FW, Indiana on Saturday, December 31, 2011

Crutchfield Customer Review (What's this?)

I bought this for my wife's Jeep Liberty. We were trying to do something on a budget and beat the factory sound. We're pushing a set of Pioneer 6 1/2 separates and another pair of 6 1/2 Pioneers for the doors, all off the front 2 channels. The rear channels are bridged and driving a single 10" Rockford Fosgate sub. The set up was an afterthought when the 4 Pioneers didn't deliver the sound that we wanted. The same afterthought resulted in the set up that we now have. The amp is seeing a constant 2 ohm load and seems to perform well. No sound complaints what so ever. She does not have fader control now, but never used it anyway.

The mounting brackets are mediocre at best. Plastic, c'mon! You need to slide a screwdriver through a hole in the top of the amp to screw it down. Holes are too small and also preclude you from using proper screws. When looking into sub options, I opted to go away from the compact powered Sound Ordnance sub because of a customer review indicating that mounting of that sub was also poor. It wouldn't be fair to say that their R & D department designed and built nice stuff but failed to actually install it in the real world, but I have thought it.

Pros:

Sound, performance, price.

Cons:

Mounting brackets.

2 out of 2 people found this helpful

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4 out of 5

Great

Written By RK, Wi on Wednesday, December 28, 2011

Crutchfield Customer Review (What's this?)

I got a whole entry level system for my sons truck. All Sound Ordinance; 4 speakers, 4 channel amp and the 8 inch sub connected with a JVC head unit. I was not to impressed when i opened the boxes but i thought lets give them a shot. After everthing was connected I was blown away with how good it was for the price. You will not win any sound audio contests but if you want a good everyday audio system you will not be disappointed. PS: That little 8 inch sub is awesome I just wish it had mounting brackets.

Pros:

Great amp.

Cons:

nothing yet.

1 out of 1 people found this helpful

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4 out of 5

Big for the power

Written By Geoffrey, Rochester, NY on Friday, September 16, 2011

Crutchfield Customer Review (What's this?)

It does the job well but check out its size. It is big for the power output. The unit has chrome plated bezels near the terminal blocks so don't try to tighten the power terminal with the battery connected. Oops.

1 out of 1 people found this helpful

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4 out of 5

Good quality amp for the money

Written By KB, Badin NC on Wednesday, June 08, 2011

Bought this amp to replace the factory amp in my 99 BMW 328ic. Sounds great and didn't have to spend big bucks to get it. Tech support was great in finding a problem with the first amp shipped, second was shipped free of charge and as always it was on my doorstep within a couple days. Would definitely buy this brand again. Thanks Crutchfield

1 out of 1 people found this helpful

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Rated 5-stars by consumers

For a more in-depth review and enhanced detailed information on the Sound Ordnance™ M-4050, please visit the Crutchfield website product page (/S-GuTiiicnMxD/p_777M4050/Sound-Ordnance-M-4050.html ).

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Sound Ordnance™ M-4050

4-channel car amplifier — 50 watts RMS x 4

$109.99

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StreetWires ZeroNoise 3 ZN3K-08

8-gauge amplifier wiring kit — red power/brown ground

Get 50% off with a select amp

$34.99

In Stock

Speaker Wire

StreetWires 14-gauge Super Cable™ Speaker Wire

Translucent blue jacket — priced per foot (Clear)

$1.49

In Stock

RCA Patch Cables

StreetWires Zero Noise 5 Stereo Patch Cables

High-performance cables with superior noise rejection (3.3-foot)

$14.99

In Stock

Firewall Bushings

StreetWires Firewall Bushing

Protect your 8-gauge cable against firewall damage

Also available in:
Open Box: $6.99

$9.99

In Stock

Fuses

StreetWires AFS Fuses

2-pack (6 sizes available) (100-amp)

$9.99

In Stock

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Sound Ordnance M-4050

4-channel car amplifier — 50 watts RMS x 4

Item# 777M4050 offer details

Review Summary

By buying this product you'll earn up to 110 Rewards points.

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

Our take on the Sound Ordnance™ M-4050

by Buck Pomerantz

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Bang for the Buck

Excellence in Both Product and Sound

Astounding!

great

Awesomeee

Sound Ordnance M-4050

Great amp

Sound OrdnanceT M-4050

Plenty of Power

Crystal Clear

First time buyer

Just what I needed at a good price

Great sound!!

SO M-4050

Big sound, big amp

Ok when it's warmed up.

SO M 4050 amp

Great

Big for the power

Good quality amp for the money

Accessories

Add accessories for the Sound Ordnance™ M-4050

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

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Single-amp Wiring Kits

Speaker Wire

RCA Patch Cables

Firewall Bushings

Fuses