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Sound Ordnance M350-1

Compact mono subwoofer amplifier — 350 watts RMS x 1 at 2 ohms

Item # 777M3501

Your vehicle's interior is like an audio battlefield with your music fighting to get heard over the noises of the...

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Your vehicle's interior is like an audio battlefield with your music fighting to get heard over the noises of the...

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$129.99

About the Sound Ordnance M350-1

Give your bass some firepower

Your vehicle's interior is like an audio battlefield with your music fighting to get heard over the noises of the wind and road. Sound Ordnance's M350-1 mono subwoofer amplifier can provide up to 350 watts RMS to your sub — more than enough power to overcome all the sonic enemies of clean loud bass. A wired remote lets you control the level of bass action from the comfort of your front seat.

Give your bass some firepower

Your vehicle's interior is like an audio battlefield with your music fighting to get heard over the noises of the wind and road. Sound Ordnance's M350-1 mono subwoofer amplifier can provide up to 350 watts RMS to your sub — more than enough power to overcome all the sonic enemies of clean loud bass. A wired remote lets you control the level of bass action from the comfort of your front seat.

Rugged and compact

A low-pass filter, subsonic filter, and adjustable bass boost allow you to control the bass tone at will. This amp's tiny size allows it to fit almost anywhere in a vehicle. Its tough construction, rugged looks, and 3-year warranty ensure you will enjoy the full power of your music for the long haul. Even better, you can add this Sound Ordnance amplifier to your arsenal at a great price.

Sound Ordnance M350-1 350W x 1 at 2 Ohms Car Amplifier

This little powerhouse gives you extensive control over your bass.

Confused about impedance? Check out our article on matching subs and amps.

READ LESS

Product highlights:

  • mono subwoofer amplifier
  • 290 watts RMS x 1 at 4 ohms (350 watts RMS x 1 at 2 ohms)
  • Class D amp technology
  • variable low-pass filter (35-150 Hz, 12 dB/octave)
  • variable bass boost (0-18 dB, at 45 Hz)
  • variable subsonic filter (15-55 Hz, 12 dB/octave)
  • wired remote level controller
  • preamp inputs
  • cooling fan
  • fuse rating: 30A x 2
  • 8-gauge power and ground leads recommended — wiring and hardware not included with amplifier
  • 8-1/4"W x 2-1/16"H x 4-3/4"D
  • warranty: 3 years
  • Our 60-day money-back guarantee
  • MFR # M350-1

What's in the box:

  • Mono amplifier
  • Two 30-amp ATO blade fuses (installed)
  • Wired remote
  • 16' Remote cable (RJ-25 connector on both ends)
  • 3mm Allen wrench
  • Six 3/8" Self-tapping screws
  • 6 Split lock washers
  • 6 Flat washers
  • Owner's Manual

Customer reviews

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Sound Ordnance M350-1 reviews

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Features
Connections

Features

Power Ratings: The Sound Ordnance M350-1 is a Class D mono subwoofer amplifier with an RMS power rating of 290 watts into 4 ohms and 350 watts into 2 ohms.

Crossovers: The built-in low-pass crossover is continuously variable from 35 to 150 Hz and the slope is 12dB per octave. Because this is a subwoofer amp, the crossover is always engaged.

Sub Sonic Filter: The frequencies that cannot be reproduced by a subwoofer waste amplifier power and can cause damage to speakers. The sub sonic filter, variable from 15 Hz to 55 Hz, removes the signal below the setting to improve the performance of the speakers by eliminating distortion.

Bass Boost: The Bass EQ (bass boost) is continuously variable from 0 to +18 dB and is centered at 45 Hz.

LED Indicators: There are 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.

Wired Remote: The included wired remote allows you to control the output level of the amplifier from the front of your vehicle. The wired remote can be mounted under your dash and the supplied 16' cable, with RJ-25 phone plugs at each end, connects the remote to the amplifier. The remote's dimensions are approximately:

  • Width: 1-5/8" (2-5/8 including mounting flanges)
  • Height: 7/8"
  • Depth: 1-1/2" (2-1/8" including knob and cable)

Fan Cooled: A thermally-activated fan on the bottom of the amp helps cool the internal components.

Connections

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 also a set screw terminal that will accept up to 8-gauge wire. A 3mm Allen wrench is required to tighten/loosen the terminals (included).

Speaker Connections: The speaker output is a screw terminal that will accommodate up to 8-gauge wire.

Signal Inputs: The amplifier has a pair of stereo RCA inputs.

Remote: Connect the included wired remote to the RJ-25 port on the amplifier.

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
First one die after three years. [ SHAWN  Feb 12, 2020 ]
A
Previous experience in another car. Unit rocks, price point is great as well. [ Jorge  Dec 15, 2019 ]
A
This seems to meet the requirements for my sound system. [ Nicolas  Oct 15, 2019 ]
A
It has everything I need and should pair up nicely with the Sound Ordinance sub that I already have. It also comes at good price. [ george  May 12, 2019 ]
A
replacing a amp that has too much power [ Gerald  Mar 27, 2019 ]
A
I just bought a Sound Ordnance B-12 to go with it [ J  Jan 16, 2019 ]
A
This amp was recommended in the past and has great reviews. This will be my first Sound Ordinance product so I cant wait to see how it works! [ Joel  Jan 05, 2019 ]
A
Great reviews [ Robert  Dec 31, 2018 ]
A
Needed a small amp to fit under the drivers seat. This one has desirable specs and good reviews. [ Bryan  Oct 18, 2018 ]
A
Advisor confirmed that this amplifier was a good choice for the subwoofer I chose. [ Richard  Oct 03, 2018 ]
A
My old amp died on me and the sound ordnance m350-1 uses the same gauge wiring kit. Figured I'd use it. [ Ruben  Sep 27, 2018 ]
A
Physical size was critical and have had good luck wit S/O equipment in the past [ gene  Sep 03, 2018 ]
A
Hank also recommended this amp to me along with the Bandpass subwoofer by Sound Ordnance [ Dylan  Aug 22, 2018 ]
A
Need a miniature subwoofer amplifier for my Lotus. [ RICHARD  Aug 19, 2018 ]
A
I needed an amp that would run my 10in DVC 4ohm sub at 2ohm... this is the only amp from S/O available. [ Jason  Aug 02, 2018 ]
A
The amp I had is smoked. [ Robert V.  Jul 26, 2018 ]
A
I have a couple of identical 8-inch active subs, but their amps started malfunctioning. I liked the sound from those subs, and the black aluminum ported enclosures were beautiful and efficient. So, I decided to keep the subs with the enclosures, but power them from the new amp. This Sound Ordnance M350-1 amp I just bought has the appropriate electrical specs to drive my 2 subs, and is not excessively large: the footprint: is about 8" x 5" rather than about 8" x 8" many other amps have. [ Andrei  Jul 20, 2018 ]
A
Cole Recommend This amp for the Kicker box i recently purchased. [ STEVEN M  Jul 19, 2018 ]
A
Small footprint, Good Reviews. Great Price [ Stephen  May 29, 2018 ]
A
Great price for a fan cooled mono block amp. [ SHAWN  May 28, 2018 ]
A
This amp was recommend for my sub which has dual 4 ohm voice coils, 50-250 watts RMS and peak 500 watts. [ Laura  Apr 29, 2018 ]
A
It has the right RMS for the 12" sub I bought, and it has great reviews on Crutchfield and has a very competitive price. [ Ory  Mar 27, 2018 ]
A
I already had this amp in the Jeep. During hurricane Harvey while trying to help some people I went into deep water and got a few inches of water in the floor boards where the amp was located. It of course did not like this. lol But I loved the amp and it pushed my s/o box perfectly so I am just getting one to replace it. [ LESLIE J  Jan 27, 2018 ]
A
cause the legend levi said it would work best with my existing setup [ Brian  Dec 29, 2017 ]
A
Good reviews and price [ SHAWN  Dec 22, 2017 ]
A
Good pairing with the Sound Ordnance bandbox 12 [ RODNEY  Dec 14, 2017 ]
A
Needed a more powerful amp for my subs, tom advised me to try this one [ Phillip  Dec 04, 2017 ]
A
A Crutchfield advisor recommended it for the JL Audio Stealthbox [ Matthew  Nov 09, 2017 ]
A
Doing the research I found the consensus was the combination of the Kicker sub I bought and this Sound Ordnance amp. Then talking with the Crutchfield support staff enabled me to make the choices I made with confidence. With Crutchfield doing all the leg work and testing there is no question that information you're being given can be taken to the bank. [ Gina  Sep 24, 2017 ]
A
recommended by staff [ Geoffrey  Sep 20, 2017 ]
A
It's a great little amp with serious power. The Houston flood of 2017 killed my S.O. 350. [ LEONARDS  Sep 17, 2017 ]
A
Bought this in 2010. It recently broke. [ Kevin  Aug 14, 2017 ]
A
I picked this amp because its made in the USA and is small and compact. I hope it performs as rated. It is small and compactand should fit nicely in the dash above my glove box were I plan on putting it. [ keith  Jul 29, 2017 ]
A
Smaller size and good reviews. [ Mike  Jul 07, 2017 ]
A
Gives just what I need for my daughters S/O sub , plus a little extra [ Joshua  May 15, 2017 ]
A
price / size / feature - remote gain control. replacement for another amp sold at Crutchfield that only lasted 2 years in a non-abusive application [ David  May 09, 2017 ]
A
I need a compact amp for my sub: this unit has more features and performance for the size and price. And it received many positive reviews. I'll be installing it under the driver's seat of a 1987 Suzuki Samurai. I will provide feedback after I install it. [ Vincent  Mar 08, 2017 ]
A
size. needed something that would fit my 2015 silverado double cab. With sub box its difficult to fit standard size amps behind the sub box and rear wall. [ christina  Jan 28, 2017 ]
A
Because you can't beat the warranty and the quality. THis littel amp pounds the single 12" S/O amp my son has. Sounds like 2 12s in there! [ LESLIE J  Dec 27, 2016 ]
A
Was looking for great mono power in a small package and an unbeatable price! [ Kris  Nov 08, 2016 ]
A
This is my 3rd S/O amp they are small and powerful easy to adjust and this one comes with a remote. [ John  Nov 03, 2016 ]
A
Class "D" performance in a small inexpensive package. [ M  Sep 30, 2016 ]
A
Larry helped to spec this out. It is a powerful amp that will run the sub perfectly and is very reasonably priced. Thanks Crutchfield! [ Jason  Sep 29, 2016 ]
A
Price and power rating. A lot of bang for the buck, I don't have a show car or system. I just want good solid sound at a decent price. [ GENE  Jul 11, 2016 ]
A
Had great reviews [ Abigail  Jul 07, 2016 ]
A
Based on the excellent advice of Chip, the advisor who guided my selection. Chip's Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=210 [ LARRY  Jul 05, 2016 ]
A
Compact size and good reviews. [ lovethetwins  Jun 25, 2016 ]
A
it's a class d and has a cooling fan which I like. [ charles  Jun 22, 2016 ]
A
Size, size, size!!! I need something small but powerful to get more bass in my system. This will fit right where I want it to. I can't ask for more. Price and power were right at my level also. Good stuff. [ Michael  May 16, 2016 ]
A
Needed a mono block and for the brand new sub. [ A  Apr 24, 2016 ]
A
Get 50 extra amps for $30 less [ Ben  Apr 04, 2016 ]
A
This just seems like it will make a decent amplifier for my single 1262W infinity sub woofer. [ Samuel  Feb 18, 2016 ]
SHOW MORESHOW LESS

16 questions already asked

Q
What is the distortion percentage on this amp?
[ Chase  May 12, 2020 ]
1 answer
A
Total harmonic distortion is 0.05%.
[ Bryan  May 13, 2020 ]
Q
Will this amp work as a replacement for my 03 mustang gt so I will be able to use aftermarket front door speakers?
[ Kyle  Apr 08, 2020 ]
2 answers
A
This is a mono-amp, meaning 1 channel. If you are talking about a Left / Right speaker setup, this would only produce sound for one channel. Typically this would be used for subwoofers either by a Sub out from the head unit or splicing into the Right and Left channel and plugging that into the amp, the output would be 1 channel.
[ Michael  Apr 20, 2020 ]
A
No this is a single channel sub woofer amp. You need a 2 or 4 channel amp
[ Michael  Apr 20, 2020 ]
Q
With the amp having only one set of outputs, how would you bridge to get 4 ohms?
[ Jim Jim  Oct 28, 2019 ]
1 answer
A
You can not bridge that amp. The subwoofer(s) will dictate the impedance. You will either need to connect a single voice coil 4 ohm sub or something you can wire in series to 4 ohms. You can find a good chart in this article about all the different subwoofer impedance combinations: https://www.crutchfield.com/I-rET1c290/learn/how-to-match-subwoofers-and-amplifiers.html
[ Cosmo  Nov 11, 2019 ]  Staff
Q
With the amp having only one set of outputs, how would you bridge to get 4 ohms?
[ Jim Jim  Oct 28, 2019 ]
3 answers
A
I do not know of a way to bridged this amp into 4 ohms load. You could however connect a 4ohm sub but the output will only be 290 W. You will get 350 W with a 2 ohm sub!
[ Jorge  Nov 08, 2019 ]
A
The amp doesn't 'bridge' An amplifier outputs power based on the impedance ( or resistive load) presented to it. If you put a 2-ohm load on the amp, you can get 350 watts RMS, if you put a 4-ohm load on the amp you can get 290 watts RMS from the amp. To get 4-ohm power ratings, you need a 4 ohm sub.
[ Calvin  Nov 08, 2019 ]  Staff
A
The beat I figure is that the amp switches to 4ohms from internal circuitry. I have a sub with the capability of switching between either 2 or 4 ohms. The change in load requirements should make the amp switch to the proper impedance.
[ ORELVIS  Nov 07, 2019 ]
Q
I already own this amp paired with the B-17 sub, my question is can I get the exact same amp/sub setup and daisy chain the amps together to push each B-17? Thanks!
[ Walter  Mar 10, 2019 ]
3 answers
A
But you can power a second b-17 if you wanted to or have the room for it
[ Bryan  May 13, 2020 ]
A
I am by no means an audio installer or genius. But my first guess would be to say absolutely no. Using two amps to power one speaker either in series or parallel is a big no no.
[ MICHAEL  Mar 19, 2019 ]
A
I have 2 m-350's pushing 2 seperate subs but they are not chained together as there is no master/slave switch and there is no hole for RCA out. You will not be able to "daisy chain" the amps but you can still happily pick up the same amp and sub and wire it into the system, the only thing to make sure of is that you upgrade the fuse on the positive connections feeding the system, your battery will experience more amperage draw due to having a second amp and could heat the wire to a destructive level if it is too skinny or too short to handle the extra current your drawing. Best of luck! If i havent answered your question properly and you are still unsure of yourself cruthfeild will most likley contact you soon regarding my failed attempts :)
[ ANTHONY  Mar 19, 2019 ]
Q
How loud is the cooling fan?
[ B  Mar 24, 2018 ]
4 answers
A
you do not hear it
[ Perry  Apr 03, 2018 ]
A
Not even noticeable when you have music playing. Powered up with no music I would compare it to a CPU fan, maybe a bit louder, but nothing intrusive and it's certainly nothing worry about when considering the product unless you're sensitive to a fan humming.
[ Kyle  Apr 03, 2018 ]
A
I have never heard the fan at all. I have it installed in the stock location of the 3000GT which is on a bracket underneath the front passenger seat. All of the material around it would deaden any noise it might create otherwise.
[ David  Apr 03, 2018 ]
A
I don't even hear it and it's right behind my seat.
[ THOMAS  Apr 03, 2018 ]
Q
How loud is the cooling fan? Can you hear it when the music is on mute?
[ B  Mar 23, 2018 ]
4 answers
A
No you can't hear the fan. It's quiet
[ Anthony  Apr 03, 2018 ]
A
It is very quiet it would ramp up if needed but it is quite
[ Dan  Apr 03, 2018 ]
A
I've never heard the fan unless I put my ear right next to the amp. It's a pretty small fan too.
[ Daniel  Apr 03, 2018 ]
A
I have never heard the cooling fan, if it has one.
[ Drake  Apr 03, 2018 ]
Q
What gauge wire would you recommend for running from the amp to the speaker?
[ tomdjr  Feb 11, 2018 ]
2 answers
A
16ga is fine for up to 100watts and 2ohm X12FT(length of run) and 4ohm X24ft, in low voltage applications more wire strands is better, that is a wire with 40 strands is better than a wire with 20 strands.
[ Anthony  Feb 19, 2018 ]
A
I'm using 16g speaker wire which may be overkill
[ Michael  Feb 12, 2018 ]
Q
What is the max gauge power wire this will accept?
[ Donny  Feb 06, 2017 ]
1 answer
A
The Sound Ordnance M350-1 uses set screw terminals for the power and ground connections which accommodate up to 8-gauge wire. I hope that helps!
[ Larry  Feb 18, 2017 ]  Staff
Q
Does the amp use the L or R input RCA to transmit to the sub? I dont want to wire both channels.. whats the mono channel? normally its left.
[ scpy15  Nov 07, 2016 ]
1 answer
A
Whichever channel you send from your head unit is the channel it will process. So for instance my head unit has a left right and sub RCA channel. I use the sub channel to this amp because it is powering my sub. Your head unit will have the Front channel, rear channel, and/or sub channel. If you only have front and rear, then use the rear channel and set your cross over appropriately and you'll be good to go.
[ Wasey  Nov 07, 2016 ]
Q
Where/how would you set the INPUT LEVEL on the amp when the receiver (KDC-X799) has its own level adjustment (-15/+15)?
[ Mustang  Aug 15, 2016 ]
2 answers
A
Agreed with setting the sub out to zero but make sure all settings are set to zero or flat before setting the gains on any amplifiers. That includes any bass,treble,equalizer, and even level out settings. Once the gain/s are set then you can do your adjustments.
[ Bryan  May 13, 2020 ]
A
I would set the Kenwood to 0DB on that negative 15 to positive 15 adjustment then set your amplifier gains I believe that will give you the least distortion
[ Dan  Aug 17, 2016 ]
Q
Is the remote required for operation?
[ Mustang  Aug 15, 2016 ]
4 answers
A
Nope. It's optional.
[ Anthony  Aug 18, 2016 ]
A
I don't believe you need to have the remote hooked up to use the amp you would just have to set the amplifier gain from wherever the amplifier is mounted instead of next to you or your seat.
[ Dan  Aug 17, 2016 ]
A
No
[ Charles  Aug 16, 2016 ]
A
I honestly can't say if it's required as I haven't run mine without it. I will say that I do use the remote more than I thought I would. Radio, satellite radio and streaming all have different audio levels, so as I change between them, I regularly adjust the remote to change the impact of the subwoofer. Sorry I couldn't answer your question directly.
[ Drake  Aug 16, 2016 ]
Q
Is this designed for 1 sub or two?
[ CHad  Aug 13, 2016 ]
3 answers
A
One
[ SHANNON L  Aug 15, 2016 ]
A
You can run 2 subs but they together need to be compatible with the specs of this amp. So if you run two 4 ohm subs in series that'd give you your 2 ohms overall. Also the two subs could only be 175 watts rms max a piece (to accommodate the 350 watt output of the amp)
[ Wasey  Aug 13, 2016 ]
A
One
[ Thomas  Aug 13, 2016 ]
Q
Is this amp a good match for a 30 watt, 8 ohm sub?
[ Maria  May 08, 2016 ]
1 answer
A
Thanks for your question. For information on selecting the best amp for your subs 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.
[ Kenny  May 10, 2016 ]  Staff
Q
Would this amplifier be too much power for a JL Audio 8" W3V3-4 if the gain was set properly? JL Audio recommends 250 watts or less RMS for that driver but the options are limited to either 150 watts RMS or over 250 watts RMS at 4 ohm's and these are all rated at 14.4 volts and most charging systems are 13.8 volts so 14.4 is unrealistic. I have 160 watts RMS now and feel I need at least 200 watts RMS. Price, size, and power consumption is a consideration.
[ John C  Apr 25, 2016 ]
2 answers
A
Yes, with the gain set properly /lower. This is a good match. When selecting/matching speakers to amplifiers. You want to supply close to but not more than the the upper RMS rating of the speaker. For example a speaker with a operating range of 5-60watts RMS, you want to supply 45-60 watts for the best performance.
[ Anthony  Apr 03, 2018 ]
A
The Sound Ordnance 350-1 says it puts out 290 watts @ 4 ohms so you're probably safe using it for your subwoofer.
[ Daniel  Apr 25, 2016 ]
Q
Which amp would be a good match for the MTX Terminator TNE212D ?
[ Brian  Apr 16, 2016 ]
1 answer
A
Per MTX's website, the TNE212D is rated to handle 400 watts RMS at 2-ohm so the Sound Ordnance M350-1 would be a better match to sufficiently drive those subs. I hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=159
[ Larry  Apr 19, 2016 ]  Staff
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