Name: Sound Ordnance M-4050
Brand: Sound Ordnance
SKU: 777M4050
Rating: 4.5 (113 reviews)

Overview

by Crutchfield's

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.

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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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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
MFR # M4050

What's in the box:

Sound Ordnance M-4050 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

Sound Ordnance™ M-4050 reviews

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113 reviews

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Details

Researched by Crutchfield's Mark G.

Features & specs

Performance
RMS Power Output (Watts x Channels)	50 x 4
Peak Power Output (Watts x Channels)	94 x 4
Power at 2 Ohms (Watts x Channels)	90 x 4
Bridged Power (Watts x Channels)	180 x 2
Minimum Impedance Bridged	4
Minimum Impedance Unbridged	2
Minimum Impedance	2
Best Frequency Response	12-25k Hz
THD at Rated RMS Power	1%
Signal to Noise Ratio	96 dB
Input Voltage	14.4v
Features
Amplifier Class	AB
Low-Pass Crossover Frequency	50-250 Hz
Low-Pass Slope (dB/octave)	12 dB/oct
High-Pass Crossover Frequency	80-2k Hz
High-Pass Slope (dB/octave)	12 dB/oct
Bass Boost	0, 6, 12 dB
Bass Boost Frequency	45 Hz
Fan Cooled	No
Fuse Rating	40
Speaker Level Inputs	---
Preamp Outputs	1 pair
Width (inches)	14-1/8
Height (inches)	2-1/8
Depth (inches)	9-13/16
Parts Warranty	3 Years
Labor Warranty	3 Years

The Sound Ordnance™ M-4050 replaces these items:

Product Research

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.

The Sound Ordnance™ M-4050 replaces these items

Sound Ordnance™ M-4100

4-channel car amplifier — 100 watts RMS x 4

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270 watts RMS x 2 at 4 ohms bridged
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Bazooka MGA465

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variable high- and low-pass filter (50-250 Hz, 12 dB/oct)
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Eclipse EA4200

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Class D design produces less heat and uses less power
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Accessories

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Q&A

17 questions already asked

Is this amp being discontinued and if so , will there be something like it ? I was wanting to get an AB amplifier and liked that it would match the 1500 mono block in looks.

[ Robert Mar 12, 2018 ]

1 answer

This amp has been discontinued. There is no direct replacement for it and the closest I have to this look is a class D 75W RMS x 4 channel amp found here: http://www.crutchfield.com/p_777M754/item.html My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=101

[ JASON Apr 02, 2018 ] Staff

Can I parallel the front and rear speakers to the front channels thereby making them 2 ohms? And then bridge the rear channel to run a sub?

[ rick Dec 11, 2017 ]

2 answers

Good morning Rick, I apologize for not being able to answer your question, I had purchased the amp as a gift for my son. Good luck to you.

[ VINCENT Dec 11, 2017 ]

Yes, that's actually exactly how I have mine set up.

[ eric Dec 11, 2017 ]

If I want to run front speakers at 2-35 watts rms and rear speakers at 15-90 watts rms, and finally a sub at 250 watts rms, will it work if i bridge the sub? I plan on placing both the front negatives on the same terminal, and both the front positives on the same terminal, and same for the rear speakersleaving me with 2 open outputs for me to bridge my sub to. Just need to know if the rms ratings are good for this amp.

[ Luke Phillip Oct 15, 2017 ]

1 answer

If you bridge the sub, that leaves you with 2 channels open on the amp. You would need an additional 2 channel amp to connect all 4 speakers. Or connect the 4 speakers to the SO, each having its own channel and an additional amp to power the sub. Or use the SO to power the sub and 2 speakers and connect the 2 others directly to head unit. I would not connect 4 speakers to 2 channels...

[ GREG Oct 15, 2017 ]

can this amp be ok with 60 or 75rms speakers? or does it have to be matched with 45 to 50rms speakers only?

[ sandeep Mar 11, 2017 ]

3 answers

While some hyper sensitive enthusiasts will argue the point; you will be fine with the speakers you have. Mine bounces around under the seat of my 4x4 and it has performed great for 2 years now. Sounds great.

[ stanton Mar 14, 2017 ]

I'm sure it would do fine. I would ask the techs at Crutchfield. Their customer service is amazing. I've bought 3 sound ordinance subs in 2 years and love them all.

[ MICHAEL Mar 14, 2017 ]

It will will work fine, this amp has plenty of power.

[ RAYMOND Mar 13, 2017 ]

I bought a Stinger 4 guage install kit for this amp before reading that it only accepts up to 8 guage. What is the cleanest way to reduce the size?

[ Anthony Feb 16, 2017 ]

2 answers

You can get a distribution block. Normally they are 4 gauge in and 8 gauge out 2 or 4 way.

[ Mike Feb 16, 2017 ]

He cleaneat way would be to run your 4 amp to a fuse box as close to the amp. Then run your 8 amp from there to the amp. That helps if you want to run anothet amp later. If you dont want to do that, you could simply remove some of the wiring from the 4 gauge to get it to where it would fit.

[ David Feb 16, 2017 ]

The specs show 96dB SnR. Since this amp is not 2006 compliant, how is the SnR measured?

[ Eric Jan 25, 2017 ]

1 answer

SnR can be measured on a amps individual inputs and outputs using a mathematic formula.

[ Edric Jan 26, 2017 ]

hi! I'm looking at quite a few 4-ch amp right, this one looks really good but I'd like to know two things first. I saw lots of filter and cross over, but can use this amp in by passing all of the filtering, to have 4 full range channel completely independant one from each other ? What kind of power supply is requested? thank you for your attention, best regards, Baptiste

[ Baptiste May 26, 2016 ]

2 answers

All you need is a regular amp wiring kit if you are going to run it 4 channel, I ran it two channel, with two 12 subs, only lasted for about 4 -5 months, would not suggest, spend a little more money and get a lot better.

[ TIM May 29, 2016 ]

The filters aren't fixed, so you can set up for full range. I don't think you can set filters on less than 2 inputs at a time. Power from the car battery is adequate for this amp. Hope that answers your question!

[ MAURICE F May 28, 2016 ]

I am interested in purchasing this. What wire connecting kit would I need if I was going to use 2 channels for front speakers and bridge 2 channels for a sub? Gauge size etc?

[ Brian Apr 19, 2016 ]

1 answer

FWIW - I have my amp running to a pair of subs only. Personally I like to go large (4ga from batt,) but I think you'd be safe with 8 - provided you are only installing one amp. As for speaker cable, 12ga to my subs and 10 to the rest. This amp has performed well so far (2 yrs??).

[ MAURICE F Apr 21, 2016 ]

Since S/O amps aren't 2006 compliant I'm wondering what the true RMS wattage is?

[ MICHAEL S Apr 14, 2016 ]

1 answer

Like many amplifiers, the Sound Ordnance models are rated at a 14.4 volt power input. Because most electrical systems will average closer to 12-13 volts, the output per channel will be slightly lower than rated. I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5

[ Ryan Apr 15, 2016 ] Staff

Can I use this with passive crossovers?

[ Mac Sep 28, 2015 ]

2 answers

Sure you can but the built in ones work well! So well, someone stole my son's car for it! Good amp and it will work in most situations.

[ GERALD Sep 29, 2015 ]

Yes. You can use a passive crossover with any amp. Just be sure it will handle the rated power (watts) output of the amp. Depending on the radio you have, and your set up, you might be able to use built in crossovers in the radio. Hope this helps.

[ Jonathan Sep 29, 2015 ]

Just to be clear, the rear RCA outputs are there to use for sending rear signal to another, separate subwoofer amp?

[ NICHOLAS May 22, 2015 ]

1 answer

I forwarded your question to an Advisor and they responded with the following: The RCA outputs on this stereo are used for sending a signal to another amplifier. We call this daisy chaining the amps. If you would like to discuss further you can contact an Advisor directly by phone (1-800-324-9695) or online chat.

[ KRISTINA May 27, 2015 ] Staff

Would I be able to install this amp in my 08 ram 1500 with a factory head unit?

[ Daniel Apr 13, 2015 ]

1 answer

For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

[ KRISTINA Apr 13, 2015 ] Staff

Can anyone tell me the exact dimensions of this amp? I'm trying to figure out if I'll be able to fit it in a certain space.

[ Jacob Feb 01, 2015 ]

1 answer

Width (inches)14-1/8" Height (inches)2-1/8" Depth (inches)9-13/16"

[ Jeff Feb 02, 2015 ] Staff

What is country of origin...where is is made?

[ richard Jul 06, 2014 ]

2 answers

Its affiliated with Crutchfield, so through them would be the answer.

[ PAUL T Nov 12, 2014 ]

We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.

[ KRISTINA Jul 09, 2014 ] Staff

how many subs did you put in this amp?

[ Teodorico Apr 06, 2014 ]

10 answers

Sorry it took so long That's a 4 channel amp . You hook up your 6x9 rear speakers , door speakers that's about all if you want to hook up 2 , 10"subs get the s/o 1350

[ JESUS E Apr 12, 2014 ]

I put one have a truck and don't have MUCH ROOM BUT THIS AMP HAS PLENTY OF POWER FOR MORE

[ JOHN Apr 09, 2014 ]

2 - infinity 10's this amp isn't what u think I don't like it.

[ ANTHONY Apr 07, 2014 ]

I didn't throw a single sub at this bad boy. I did, however; put some powerful full-range speakers in my car and attached them to that amp. They are LOUD and crystal clear. I know for a fact that this amp could power a few decent subs or one or two powerful ones without a hiccup.

[ WOODROW CULPEPP Apr 07, 2014 ]

None. I am driving 2 6x9's with it, and using an mp3 player instead of a head unit.

[ KURTIS Apr 07, 2014 ]

One 10 inch

[ THEODORE Apr 07, 2014 ]

Just one bazooka tube in a boat. Had to turn this down to minimal output cause it was too much juice. I'm. Not a full blown stereo dude though, just a regular guy.

[ CORBYN Apr 07, 2014 ]

Zero. I used it to power 2x 100w mids by Polk.

[ ERIC Apr 07, 2014 ]

One sub. I think it can take two.

[ RONALD W. Apr 07, 2014 ]

Just one bazooka tube in a boat. Had to turn this down to minimal output cause it was too much juice. I'm. Not a full blown stereo dude though, just a regular guy.

[ CORBYN Apr 07, 2014 ]

Would this amp have enough juice to power a set of component speakers as well as a single 12" sub?

[ John Jan 25, 2014 ]

1 answer

Thanks for your question. For information on selecting the best amp for your speakers I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They will be able to help determine the differences between the amp models and help you make the best choice for your system.

[ KRISTINA Jan 26, 2014 ] Staff

how does this compare to the other amps out there?

[ Aaron Jan 04, 2014 ]

9 answers

Good evening Aaron, i wish I could help but returned the unit due to the size.

[ JUAN Jan 06, 2014 ]

I have had no issues with it and it is very easy to adjust and gives good power output.

[ LANCE C Jan 05, 2014 ]

it's ok but you get what you pay for.

[ ANTHONY Jan 05, 2014 ]

Aaron I purchased this for my daughter's car and it is awesome! She and her friends get rocking and I can hear her coming home a block away. (not good for neighborly accord) The quality is way above the other units I looked at. The only negative , and it's really not a huge deal, but the attaching port for the keyed wire to turn on the unit is for a 10 ga. wire and the wire that is sent to attach there is probably a 16 ga. so you have to fold and solder the end to get it to be captured by the set screw. Other than that its been great. Good value for the money. Dave J

[ DAVID R Jan 05, 2014 ]

I just put this in my sons car and was able to crank it up almost all the way up with no distortion. I will be putting this in my hot rod as well! Money well spent!

[ GERALD Jan 05, 2014 ]

It's a quality amp for a significantly cheaper price than the name brands out there. I bought it with kicker 3ways in the back and it brought the life out of those and was hitting wayyyy lower notes than I could get with the kicker 30w amp I had. Definitely would suggest buying it.

[ DAWSON Jan 05, 2014 ]

I was a little skeptic about this amp when i was searching for one for my speakers, but for the price and everything, i figured i'd give it a try. I was very pleased first of all with the service from crutchfield and the easy of installation. Everything on the amp is marked very well and its very self explanitory. The quality of the amp is great too! The output you get is just so clean and for the price, its pretty much unbeatable. You can get the same from alpine or kenwood or any others for that matter, for double the price though. Definately would recommend it, especially if you're trying to stay in a budget.

[ JOE Jan 04, 2014 ]

This was my first so I'm not sure how it compares with others. But i can tell you that it is really good And has held up well. No problems

[ THOMAS Jan 04, 2014 ]

I really enjoy this amp for the price and design but tuning it can sometimes be a hassle since it's Angled oddly. Overall it's a great product

[ OSVALDO Jan 04, 2014 ]

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Sound Ordnance M-4050

4-channel car amplifier — 50 watts RMS x 4

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