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Sound Ordnance M-4050

4-channel car amplifier — 50 watts RMS x 4

Item #: 777M4050

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87 Reviews


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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.

Product 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

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.

Sound Ordnance™ M-4050 Reviews

Average Customer Review:

87 reviews
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Good amp

Written By Fish, Jennings LA on Wednesday, November 18, 2015

Crutchfield Customer Review (What's this?)

Great amp great price

Pros: Price

Cons: None

Sound Ordinance M4050

Written By Whaler, Corpus Christi Texas on Wednesday, November 18, 2015

Crutchfield Customer Review (What's this?)

Excellent product! Works beyond my expectations and was really easy to install. Instructions were clear and concise.

Pros: Works great and easy install

Cons: None that i found. Just good good good.

Sound Ordnance M-4050

Written By Mark, Pennsylvania on Sunday, September 27, 2015

Crutchfield Customer Review (What's this?)

A great well built Amp and nice options like the built in crossovers and super bass settings, and at a more than reasonable price. You cant go wrong.

Pros: built in crossovers. super bass settings. low price

Cons: None ... you cant go wrong. Buy one!

Solid amp for the money

Written By Rupp, Indiana on Sunday, September 20, 2015

Crutchfield Customer Review (What's this?)

This is a large amp. You may find it challenging to fit under a seat. Clean sound. Solid stats for an amp in this price range. The chrome time on the amp feels and looks a little cheap . I don't necessarily know that I would feature this amp as the centerpiece of my car audio display. Mounting screw are shot. Plan to use a long Phillips head screw driver or have an extended bit in your drill. Be careful. The plastic chrome on the top of the amp is easily damage while mounting due to the use of short mounting screws.

Pros: Clean sound. Great frequency response and THD for an amp in this price range. The price...thats' why you are looking a this amp in the first place. Good features and flexibility with mono bridging option. Good manual. Nice schwag included in the box (cool dog tag and sticker).

Cons: Fit and finish feels a little cheap. Specifically plastichrome on top/sides of amp. Short mounting screws increase likelihood of damaging the appearance of the amp while mounting. Large size limits mounting options.

Great Amp

Written By Chris D, Wisconsin on Saturday, August 01, 2015

Crutchfield Customer Review (What's this?)

Solid amp. It's been powering my four aftermarket speakers for a year now without any issue. Great sound from this amp and it stays relatively cool on the floor behind my passenger seat. Slightly large but it performs well.

Pros: Stays cool Drives speakers well Easy to install

Cons: Slightly bulky

Sound OrdnanceT M-4050

Written By stanton, Texas on Saturday, August 01, 2015

Crutchfield Customer Review (What's this?)

Amp is much larger that I thought it would be reducing the placement options in a small truck cab. This amp works very well for a budget amp.

Pros: Works as advertized.

Cons: Very large

Great amp

Written By Deaven, Virginia on Friday, July 17, 2015

Crutchfield Customer Review (What's this?)

Great amp for the money I have no complaints

Great performance, cheap case

Written By Chip C, Colorado on Sunday, June 21, 2015

Crutchfield Customer Review (What's this?)

Bought this to replace a similar performing amp. Chose this one for the super low price, and relatively solid performance. Certainly performs well, but upon install, the housing proved to be pretty cheap and made it challenging to mount.

Pros: Great price Great performance

Cons: Cheap housing may make install challenging.


Written By Curt B, Bel Air,Maryland on Wednesday, April 29, 2015

Crutchfield Customer Review (What's this?)

Very good amp for the money. This amp is in my 2005 Hyundai,Tuscon powering a pair of Pioneer 6x9 4- way speakers in boxes, also a Pioneer 12" subwoofer. Thank you Crutchfield for having great people to deal with as they are all a pleasure to talk to.

Pros: Sounds great! Worked extensively with technical support to locate the best ground point in the car for the amp to work properly and all is well now..Thank you very much Joe L in technical support for your help in resolving the problem and your patience with me. You deserve 5 stars as well.

Cons: Had issues trying to eliminate engine noise also radio reception dropped off until amp was grounded well.

Works and sounds great

Written By AbeC, California on Monday, April 13, 2015

Crutchfield Customer Review (What's this?)

This is for a 2006 Silverado CC HD. I was upgrading my system and knew I wanted an amp. I did not want to break the bank with this system so I took a chance on the SO brand as I know Crutchfield wouldn't put their name on junk. This amp does the trick. It is driving two sets of 6.5" polks, one is the separates and the other is a coaxial. This amp makes them sound very clear and loud. The sound is very clean.

I have both the front and rear channels set to HP since I have a SO powered sub to take care of the low end. I put the AMP under the rear seat and it fit well. I have cranked it for a good half hour and it barely gets warm. I am glad I went for this instead of shelling out 3 to 4x for a name brand.

Pros: Low cost Works great

Cons: Pretty big for its power rating. Plastic mounting pieces are just okay.

Did what was expected.

Written By D. Bass, PA on Tuesday, April 07, 2015

Crutchfield Customer Review (What's this?)

Made my $50 Pioneer 6.5s & 6x9s play louder, HPF only played highs & mids allowing me to hook up a sub to balance my lows. Good for budget speakers, don't buy if you have high-end speakers.

Great amp for the money

Written By Edric, Maui on Tuesday, March 17, 2015

Crutchfield Customer Review (What's this?)

For the money, this is a great amp, however, it's a little larger then I was expecting, installed in my 65 chevy nova pushing 2 kicker DS 6x9s in the rear and 2 kicker DS 6.5's up front . It's been in use for only a week and with a very loud exhaust system on the car, I have the volume cranked up high, and so far I have great sound going through all 4 speakers and the amp stays nice and cool . Anyone on a budget I would definitely recommend .

Pros: Sounds great, easy to set up , the price is right

Cons: Amp is very large , mounting was a little tricky with hardware supplied

Quality product

Written By CLDFRZE, Wisconsin on Sunday, March 15, 2015

Crutchfield Customer Review (What's this?)

I am very pleased to have bought this amp. It functions as it should and is very simple to setup. The only flaw I see, is the fact that it doesn't have LP for the front side of the amp. So, if you bought this amp to run two different subs, thinking you would be able to bridge the front and the rear for more power, it wouldn't work as you thought. On the other hand, it works beautifully for sterio speaker/sub combo!! I'm using this amp, in combination with a S/O component speaker setup, along with a S/O single subwoofer.

I'm a very pleased customer, and would definetly reccomend this amp to someone. I would first ask them what their intensions are, so they aren't just thinking about cost, but also funtionality.

Pros: Ease of operation. solid instructions.

Cons: No LP for front speaker side of amp.

not what I wanted

Written By mike, Lexington South Carolina on Sunday, March 08, 2015

Crutchfield Customer Review (What's this?)

the amp I got was so cheap that distorted the speakers and made it sound worse than the original system

Pros: good paperweight

Cons: poor quality

great product

Written By tim, Pennsylvania on Monday, January 12, 2015

Crutchfield Customer Review (What's this?)

you can not beat this amp for the money, I am using it to run two 12"subs in the truck of my Nissan altama. very nice.

Pros: no problems

Cons: none

Solid product but beware of installing in tight spaces

Written By Mvert, New Hampshire on Sunday, January 04, 2015

Crutchfield Customer Review (What's this?)

This looks to be a really solid amplifier. For my install though, it's just not the right fit given the size. If you know where the items that I discovered that like Share are as follows: as mentioned previously the screws to hold wires in our difficult to access with the screwdriver. The other issue I had which led me to return the amplifier, is the lip on the top side of the amplifier extends over the endplates too far. This makes to your setting your frequencies and gain very difficult especially if you have the amplifier mounted vertically with the faceplate facing you. The last challenge I had with the amplifier were being mounting holes. They are recessed about an inch and a half into the frame of the amplifier. Because the holes are so small you lose the ability to use a powered screwdriver unless you have a very long Drill bit to drive the screw

Pros: Beautiful exterior, built well

Cons: Protruding lip, screw mounts make this a difficult amp to fit in a small space.


Written By Connor, Seattle on Tuesday, December 23, 2014

Crutchfield Customer Review (What's this?)

This amp was a snap to install and sounds amazing. I'm using some sound ordnance 6x9 speakers and it's a match made in heaven. Thanks Crutchfield!


Great amp

Written By Shane, Carrollton GA on Monday, December 01, 2014

Crutchfield Customer Review (What's this?)

Great value amp, east install to power all speakers in truck


Written By QD, Downingtown on Sunday, November 09, 2014

Crutchfield Customer Review (What's this?)

Awesome amp. Especially for the price. I have it powering 2 10" Polk subwoofers. I bridged it for added power and mounted the amp to the back of the sub box. Sounds great even though I have the gain turned all the way up. I also used the crossover so only lows come through the woofers. You will not regret this purchase

Pros: All the features you could ask for in a 4 channel amp for a good price. Cool looking and has great sound quality.

Cons: Its a bit husky


Written By GavinJ, Birmingham, AL on Sunday, October 19, 2014

Crutchfield Customer Review (What's this?)

Fitted into Jeep Wrangler TJ that has an aftermarket pioneer system fitted by previous owner, Sony speakers in sound at, and kickers in front. Spec on pioneer stated output about 14W, was producing minimal sound, added this amp and got a wonderful, rich, bass sound, took whole system to another level. Just perfect for the jeep, great sound, at a great price. Peyton, Crutchfield adviser put me onto this system and he did a great job with his advice.

Pros: Easy to install, clear instructions from crutchfield website Solid unit, good price, works great even with roof down on jeep

Cons: Was slightly bigger that expected, and had wanted to install under seat, but now sits behind passenger seat in floor well, raised off floor, not a problem as took back seats out of my jeep

It's too much

Written By Dave, Hawaii on Sunday, October 19, 2014

Crutchfield Customer Review (What's this?)

Well, it was too much for my system, so said the installer. He said it's a grate amp but overkill for my system...oh well I'll buid off it. It's fully adjustable with build in x-over switches and seems to run on the cooler side.

Great amp!

Written By Tony, Virginia on Sunday, October 05, 2014

Crutchfield Customer Review (What's this?)

If your looking for a good budget amp, buy this one. Works great!

Pros: Price/sound

Cons: None

Good item

Written By Anonymous, Ellicott city, md on Friday, October 03, 2014

Crutchfield Customer Review (What's this?)

Good product, best power for the price!

Its an amp

Written By Anonymous, Shenandoah, Ia on Monday, September 08, 2014

Crutchfield Customer Review (What's this?)

Its an amp. It amplifies the signal.

Pros: Sends signal to speakers

Cons: None

Great Amp

Written By Mikep, Grand Rapids, MI on Tuesday, August 26, 2014

Crutchfield Customer Review (What's this?)

This amp is high quality and delivers big time. very impressed.

Pros: Nice sound, and price.

Cons: A little big but pretty slim.

Sound Ordnance™ M-4050

Written By John R, Olustee Oklahoma on Thursday, August 21, 2014

Crutchfield Customer Review (What's this?)

Great product and can't beat price!

Sound Ordnance™ M-4050

Written By flem, N.Y. on Saturday, August 02, 2014

Crutchfield Customer Review (What's this?)

great amp with good power. Easy to adjust and stays very cool. Love the black and chrome looks Nice!

Pros: Stays cool and easy to adjust

Cons: mounting screw holes and screws are too small

was just what i wanted

Written By steve, rockland, maine on Friday, July 25, 2014

Crutchfield Customer Review (What's this?)

Works fine

Pros: Great sound

Cons: Didnt like the emblem stuck on top of it

Amazing 4 channel amp

Written By SlickVic, Yonkers NY on Wednesday, July 16, 2014

Crutchfield Customer Review (What's this?)

What an amazing amp... I didn't think I was going to get the performance I am getting from this sound ordnance 4 channel amp along with sound ordnance component 6 1/2 speakers and 6x9 speakers. I'm happy.

Pros: Great deal for great performance

Cons: None


Written By DVanC, Oak Ridge, TN on Saturday, July 12, 2014

Crutchfield Customer Review (What's this?)

Great amp for an entry to mid level system. I actually have one of these in each of my vehicles. They are clean, clear and loud. Cant beat the price, its solidly build, and it looks good.

Pros: Price - much higher quality product than you would get from a competitively priced amp. Quality - Build quality is nice, sound is very clean, and the built in crossovers work very well.

Cons: None. Seriously.

Amazing for the money.

Written By Dominic, Dallas, TX on Sunday, July 06, 2014

Crutchfield Customer Review (What's this?)

I was a little apprehensive about this amp as it is priced well below it's competition, but I was pleasantly surprised. The product arrived in a package strong enough to withstand the roughest of UPS workers, which was nice. The amp itself is very sleek and feels heavy and durable, indicative of a quality build.

Installation was very easy, as I was actually replacing another amp that had died. But it came with everything needed to replace the previous one. I went ahead and replaced the power and ground wires as the ones that came with the amp as the battery is in the rear of the car and it was an easy swap.

I have had the amp installed for about 3 weeks now and am quite pleased with it.

Pros: Cheap. Effective. Durable.

Cons: Maybe back in 2000 someone would have made fun of you for having an off brand amp, but no one really cares anymore. No downside to this amp as far as I can see.


Written By R.E.Little, Talking Rock, Ga on Tuesday, July 01, 2014

Crutchfield Customer Review (What's this?)

Improved the clarity and range of the aftermarket Pioneer speakers in my 2000 Ranger regular cab pickup. Finding a way to mount it behind the seat required some thought, but I did manage to do it.

Pros: The wiring was easy to do with the free wiring kit, although I did need to purchase extra RCA cable for 4 channel operation

Cons: Size could be a problem for some types of installations.

ok for the money

Written By walt md., murrryland on Friday, June 27, 2014

Crutchfield Customer Review (What's this?)

Ok job for the money. Entry level amp

Pros: Good

Cons: Need more power

Modest amp for a modest price

Written By Matthew, Salt Lake City on Wednesday, June 18, 2014

Crutchfield Customer Review (What's this?)

This amp does exactly what it is intended to do. Good entry level 4 channel amp for an entry level price.

Pros: plenty of power to run the fronts

Cons: the wire hold downs are somewhat difficult to get to because of the angle and are very short causing them too easily fall out after loosening just a few turns.

Great, simple, and powerful.

Written By Matt, Utah on Thursday, May 29, 2014

Crutchfield Customer Review (What's this?)

I bought this amp to power a pair of Pioneer TS-A1674R and a pair of Pioneer TS-D6802R speakers (with a Pioneer DEH-6300UB stereo). The sound is great and there is a lot more clarity from the speakers. I had it installed by a professional at a car audio shop so I can say with some certainty that it was installed correctly. Great amp for the price and came with install kit.

Pros: -LOUD -Clarity -No heat problems yet, however, we are going into summer now. -PRICE PRICE PRICE -Came with amp install kit so saved more money.

Cons: -Size wouldn't allow me to mount underneath car seat. -Slight bass distortion from my D6802R's but I need to turn it down anyways. -Slight whine noise, not sure what source is. Could be from amp or grounding or other source. Can't hear it when turned up anyways so unless you don't want to listen to music, you will be fine.

Da Secret's Out....!!!

Written By One Braddah, Koloa, Hi. 96756 on Sunday, May 25, 2014

Crutchfield Customer Review (What's this?)

OMG, I just love this AMP.!! (M-4050) I never post things, but I just had to share a few words to help others click the buy button.... It's just like Fast Food, cheap$ & does the job w/ out draining your wallet.. Best of all it is design By CRUTCHFIELD & they also gave a free 8-gauge wiring kit for a special.....duh, it was a no brainer..!! Don't for get..!! Your sounds will only be as good as your Stereo Deck, so $pend the money more on that end..... Running a Alpine Deck w/ 61/2 & 6x9's type S & 1 Polk Audio 10 All off this $100 AMP...! Crazy!!

just a great amp

Written By jeff, Wyoming, MI on Friday, May 16, 2014

Crutchfield Customer Review (What's this?)

This amp is like listen too angle from above Bill Evans first CD played the sound it just Something special to.the sound it just sweet

Pros: Ten star

Cons: None

Sound Ordnance M-4050

Written By KyleH, Rockingham,NC on Wednesday, May 07, 2014

Crutchfield Customer Review (What's this?)

Great Amp for the money. Performed exactly as needed for my application. Easy to tune and enough power to push the four MTX speakers that were used for stock replacements.

Pros: Economical, performed very well for my application, and mounted under the seat with ease in a 2007 Honda Accord.

Cons: None at this time.

Sound Ordnance™ M-4050

Written By RMB, Saint Louis, MO on Sunday, May 04, 2014

Crutchfield Customer Review (What's this?)

I needed an amp to for my new speakers this amp has performed wonderfully . Wished i had bought a higher end speaker

Pros: Great amp for the price

Cons: None

Well Worth It!

Written By M, Hamilton, MA on Tuesday, April 22, 2014

Crutchfield Customer Review (What's this?)

I needed an amp to replace an A/d/s amp in my 1985 535i; this amp has performed wondefully with my 30 year old ads speakers! The sounds is just as good if not better than my old amp. Easy install. Big plus was the free wiring kit that came with it.

Pros: Nice sound!

Cons: None at this time.

Great amp!

Written By clean music, Peoria on Saturday, April 19, 2014

Crutchfield Customer Review (What's this?)

This amp is all I expected and more! I have infinity reference components 5 1/4" in the front and 5 1/4" 2 way sound stream speakers in the back. I was using an old pioneer 2ch amp to power them all. When I hooked up this soundstream 4ch it really brought my speakers to life! Much more powerful than anticipated. I was going to get the 100w rms soundstream amp but I am glad I didn't. My speakers are 75w rms and I only have the gain set to half! The individual front and rear filters make tuning a breeze. Great amp especially for the price! !

Pros: Loud. Easy to install. Price. Looks great too.

Cons: None I can think of

Great Performance, Great Value

Written By Levi H, Ohio on Friday, April 18, 2014

Crutchfield Customer Review (What's this?)

This is an amazing amp, hands down. I have this hooked up to a pair of Kenwood 5.25 components and a 6x9 pair of Rockford Fosgates, they sound stunning now that I have this amp powering them. Beware that you probably won't be able to fit anything larger than 8 gauge into the power and ground ports on this, but that certainly doesn't affect the quality of this amp.

Pros: Powerful, solid build, good value, has RCA outputs as well

Cons: A little large for it's power range

Great bang for the buck!!!

Written By Kirk, Ocean Springs, MS on Saturday, March 15, 2014

Crutchfield Customer Review (What's this?)

I'm running two Sound Ordnance M-4050 amps in a 2013 Mustang GT. One is powering a pair of Pioneer TS-D6802R's in the front doors and a pair of Pioneer TS-A6885R's in the rear deck. The other is bridged, powering a pair of 10" Pioneer Champion Series TS-W254R S.V.C. 4 ohm subs. All of this with the stock head unit and a PAC AOEM-FRD24 factory integration adapter. The amps drive everything very well and have the potential to sound great. I say they have the potential because the stock head unit in my car is holding them back. I spent quite a bit of time trying to tune the system and have had limited success, but the I have no doubt the HU is the issue. I ordered a new HU from Crutchfield and should have it in a day or two, my first impressions of the amps are that with the aftermarket HU's adjustability I'll definitely have the sound I'm after.

Pros: Quality construction and price! Crutchfield technical support.

Cons: The amps are a little large for their power rating but not so large I couldn't find room to mount them.

Awwwww MAN! My Amp Arrived DOA

Written By Sound of Music, Florida on Monday, January 27, 2014

Crutchfield Customer Review (What's this?)

Like the title says, the amp arrived DOA. :-( Only the front channels worked. But, the sound from those channels with the rockford fosgate speakers was pretty good. Since this is my first amp, I'm impressed. Very powerful bass imo with the Rockford Fosgate Punch 6 x 9's. I wil not be needing a sub woofer. This set up provides all the bass I can handle. On just the rears, it can vibrate my car pretty hard if I crank it up. And that's without bass boost on. So, when I finally get a fully working on, I think I'll be happy. Since I had a problem, I'm very glad now that it has a 3 year warranty. Crutchfield immediately shipped out a replacement and all I have to do is send the broken one back. They pay the shipping so the Customer Service is darn good. Things happen. Nothings perfect. The replacement should arrive tomorrow. Seems like a long 5 days waiting for the replacement lol.

Pros: Powerful, clean sound (to my ears) from the working channels. Nice set of controls and adjustments. PRICE! At this price, I would think this is hard to beat.

Cons: Well, arriving DOA is not exaclty a PRO. Kinda big. Just get the measurements and make sure it will fit before you buy. Easy.

Great Sound for the Price

Written By Charles, Garland, TX on Tuesday, January 14, 2014

Crutchfield Customer Review (What's this?)

Just finished installing this amp in a 2002 Monte Carlo. I'm very impressed with the performance and sound quality of this amp.

Pros: Easy to install, great price and sounds great...

Cons: None

Great bang for the buck!

Written By Braden B, Austin, TX on Thursday, January 02, 2014

Crutchfield Customer Review (What's this?)

Great feature set for the money with awesome s/n comparatively. Hooked this up to a set if focal 165ag1 rears and Polk db6501 component fronts and it sounds fantastic. Crossovers work well and have many adjustments. Overall great so far, however it's a bit large for the amount of power it's producing.

Pros: Cost, features, s/n, warranty

Cons: Size

Great amp for the price

Written By Anonymous, Atascadero on Tuesday, December 03, 2013

Crutchfield Customer Review (What's this?)

Good amp sounds great

GM & S. O. Amp

Written By S. O.,, palm beach, Fl on Tuesday, October 22, 2013

Crutchfield Customer Review (What's this?)

not specific on the requirement to use an interface. I hade to replace the radio and install an interface.. The turn signals and chimes are the issue !

Pros: lot of power

Cons: poor sound without the interface (I hope)

great product, great price, great customer service

Written By roy, grand rapids, MI on Thursday, September 05, 2013

Crutchfield Customer Review (What's this?)

I purchased this amp add an upgrade to my aftermarket speakers and deck. It is everything I asked for and more. Easy install ready to tune and puts out high quality sound. It doesn't run very hot which is a plus and everything on it is high quality.

Pros: Original sound out of a litre priced product

Cons: It is a little bit bigger than I expected but still manageable.

sound ordnance amp

Written By johnj, williingboro nj on Monday, August 12, 2013

Crutchfield Customer Review (What's this?)

this amp was very easy to install and and has all the adjustments to make your speakers sound crisp

I'm convinced

Written By impossibledone, Granite Falls, Washington on Thursday, August 08, 2013

Crutchfield Customer Review (What's this?)

I installed this in a 90 F-150 with super cab, with an Excelon head unit, two Kenwood Excelon 6 3/4" component speakers and a S/O 12" vented sub on the bridged rear. For a while I drove it without turning up the gain and it sounded OK. Then I set the crossovers and adjusted the gains, WOW! I am a musician and an engineer and have always loved good sound and solid equipment and I was so pleased that I bought the S/O 4075 and 2100 for my wife's vibe with kenwood spkrs and Bazooka sub (it was the most space I was willing to give up in the vibe).

Unless you have a sound lab calibrated ear and your vehicle makes absolutly no sound going down the road you will be happy with S/O.

I recently spent $2500.00 for focal amps and speakers for my project car (1979 Riviera) and yes it sounds better, but you can't beat S/O with anything that costs 3x as much.

Oh BTW, the people who are breaking cases and connections should try a little finesse!

Pros: Sound Quality, Power, PRICE!

Cons: Finding a place to put this stuff in a truck cab!

Good amp, bad power connection

Written By RonG, Madison, WI on Monday, July 22, 2013

Crutchfield Customer Review (What's this?)

The amp works great, puts out good sound.

Pros: Easy to install, good set-up instructions, good value.

Cons: The shiny metal on the upper edges of the amp are grounded. When you tighten the screws for power and speakers, the shaft of the screwdriver will touch that edge. If the amp has been turned on, sparks will fly (yes, even if the power cable is disconnected at the battery terminal. The amp stores a fairly big charge). Still, it seems wise to re-tighten the connections after a day or two. Mine had become a bit loose.

Solid choice

Written By PatrickH, SC on Sunday, July 21, 2013

Crutchfield Customer Review (What's this?)

Installed this amp in my Dodge Ram 1500 to run a set of 6.5 components off the front channels and a single 10" sub off the back channels (bridged). Sound is very clean at all volumes. Some others have mentioned the amp seems larger than necessary, but I don't think it's excessively large by any means. You simply can't beat the value of this amp when considering the quality of sound and VERY low price!

Pros: price, sound quality

Great Amplifier

Written By Tiern14, Sandwich Ma on Saturday, July 06, 2013

Crutchfield Customer Review (What's this?)

This amp works great and sounds awesome. I have had only one problem with a ground loop but that isn't the amps fault

Pros: Loud sound Easy install Many tuning options

Cons: Big and bulky for small car but no problem for my truck.

Sound Ordnance 4050

Written By Judd S., Los Angeles on Thursday, July 04, 2013

Crutchfield Customer Review (What's this?)

Sounds good for the price. Very loud and clean. Perfect size to fit under the seat of my truck.

Pros: Loud, good price, easy install

Cons: Plastic wire covers are a bit flimsy.

Worth the money

Written By Anonymous, Verplanck ny on Sunday, June 23, 2013

Crutchfield Customer Review (What's this?)

Worth the money

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

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.

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

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

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

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?? sounds that good!!!

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


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.


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.


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

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.

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.

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

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

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

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.

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.

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

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

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?

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.

SO M 4050 am