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Sound Ordnance M-4050

4-channel car amplifier — 50 watts RMS x 4

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  • Sound Ordnance™ M-4050
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  • Sound Ordnance™ M-4050
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Item# 777M4050 offer details

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Sound Ordnance

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.

See more info on this item

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
 

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

Features and Specs
Performance
RMS Power Output (Watts x Channels)
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 50 x 4
Peak Power Output (Watts x Channels)
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 94 x 4
Power at 2 Ohms (Watts x Channels)
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 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
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 96 dB
Input Voltage
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 14.4v
Features
Amplifier Class
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 AB
Low-Pass Crossover Frequency
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 50-250 Hz
Low-Pass Slope (dB/octave)
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 12 dB/oct
High-Pass Crossover Frequency
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 80-2k Hz
High-Pass Slope (dB/octave)
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 12 dB/oct
Bass Boost
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 0, 6, 12 dB
Bass Boost Frequency
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 45 Hz
Fan Cooled
Loading...
 No
Fuse Rating
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 40
Speaker Level Inputs
Loading...
 No
Preamp Outputs
Loading...
 1 pair
Width (inches)
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 14-1/8
Height (inches)
Loading...
 2-1/8
Depth (inches)
Loading...
 9-13/16
Parts Warranty
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 3 Years
Labor Warranty
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 3 Years

Product Research

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.

 

Product reviews from the Crutchfield Labs

Product reviews from the Crutchfield Labs (what are the Labs?)
Video: Sound Ordnance Amplifiers

Video: Sound Ordnance Amplifiers

Video Guest
3/26/2010
 

Make your music sound lively and vital with a Sound Ordnance amplifier. Watch this Crutchfield video for a quick overview of what these amplifiers have to offer.

 

Product Reviews

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Reviews for the Sound Ordnance™ M-4050

Average Customer Review:

31 people say:

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Showing: 1-20 of 31
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5 out of 5

Sound OrdnanceT M-4050

Written By Rp, Schuylkill Haven, Pa on Monday, June 10, 2013
Crutchfield Customer Review (What's this?)
 
Never had an amp in years. Installed unit under back seat of my F-150, although it is rather large in size, what else do you keep under a back seat of a pick up? I also installed a Sony MEX BT3100P head unit, Fosgate 1683 Punch series speakers front and rear. Wiring took up most of the time since you need to run new speaker wires, power from battery and of course the RCA cables from amp to head unit. You'll want to purchase a power cable kit, If you want to maintain front and rear fader you will need a second pre-amp RCA cable, then on the Sony head unit program the sub output to speaker out. Crossover and settings on amp were straight forward. Mounting unit to bottom of seat I had to be creative. Are there better more expensive amps, perhaps. For me it works very well, my system is loud and clear.
Pros:
Good value for the money, simple to set up
Cons:
Large size and mounting hardware needs improvment
Was this review helpful?    Yes | No
 
5 out of 5

Great amplifier !

Written By Dawson, Indianapolis on Sunday, June 09, 2013
Crutchfield Customer Review (What's this?)
 
This amp was very impressive. I rewired the speaker wire to my 1999 Honda Accord and used two sets of Kicker speakers. The amount of bass I got out of these speakers was completely dependent on this amplifier. Without the amp, the speakers were fairly flat and unimpressive. This amp brought the power to life and the sound changed completely. With the x-over switch on, the bass comes over very deep even without a sub. I would highly recommend Crutchfield's Sound Ordanance.
Pros:
Easy installation , fit under passenger side seat, provides great power and sound
Cons:
The cooling vents are only on one side. The amp gets fairly warm when using if not faced the right way.
Was this review helpful?    Yes | No
 
5 out of 5

Sound Ordnance™ M-4050

Written By Anonymous, Chesapeake, VA on Sunday, June 09, 2013
Crutchfield Customer Review (What's this?)
 
Great Amp. Sounds great, and delivers a big punch...
Pros:
Great delivery...
Cons:
none
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5 out of 5

Bang for your buck

Written By Cormac M, Janesville, WI on Tuesday, May 28, 2013
Crutchfield Customer Review (What's this?)
 
While this is my first purchased amplifier and I cannot compare it to others; the sound ordinance amp fits my needs perfectly. Using the 4 channels I run ample power to my four kicker speakers. Producing crisp notes and powerful volume I couldn't have asked for a better product.
Pros:
4 Channel EQ tuning Frequency adjusters Crisp sound Powerful volume
Cons:
Large amp Heats up from regular use
2 out of 2 people found this helpful
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5 out of 5

Sound Ordnance M-4050

Written By JerryE, Council Bluffs, IA on Saturday, May 25, 2013
Crutchfield Customer Review (What's this?)
 
Easy to install and setup. Sounds great.
Pros:
Ease of Install
Cons:
Wish it was a little smaller so it could be tucked away easier
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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!!!
1 out of 1 people found this helpful
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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
Crutchfield Customer Review (What's this?)
 
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.
1 out of 1 people found this helpful
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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
Was this review helpful?    Yes | No
 
5 out of 5

Sound Ordnance M-4050

Written By DaveW75, Tujunga, Ca on Wednesday, March 20, 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.
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.
2 out of 2 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
Was this review helpful?    Yes | No
 
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
Was this review helpful?    Yes | No
 
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?
1 out of 1 people found this helpful
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1-20 of 31 >>

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100% parts and labor - no deductibles

All mechanical and electrical failures covered, includes normal wear and tear.

Your item's repaired or the full item price returned withing 5 days

Runs concurrent with manufacturer's warranty

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-gPYK4SwT9pZ/p_777M4050/Sound-Ordnance-M-4050.html ).

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    Sound Ordnance™ M-4050

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    Sound Ordnance™ M-4050

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