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Sound Ordnance M75-4

Compact 4-channel car amplifier — 75 watts RMS x 4

102 Reviews | 17 questions - 34 answers

California customers: Please click here for your Proposition 65 warning.
Overview

Our take on the Sound Ordnance M75-4

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 M75-4 4-channel amplifier can provide 75 watts RMS to each of your front and rear speakers — enough power to overcome all the sonic enemies of clean loud music.

Give your music 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 M75-4 4-channel amplifier can provide 75 watts RMS to each of your front and rear speakers — enough power to overcome all the sonic enemies of clean loud music.

Versatility

You can bridge the M75-4 for 2-channel operation to run a pair of subs with 160 watts RMS each, or send 160 watts to a sub while the front channels run your full-range speakers. Adjustable high-pass filters make 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 filters and adjustable bass boosts allow you to control the bass tone at will.

Rugged and compact

This amp's tiny size lets you fit it 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.

Installation note: This amplifier actually has two internal 30-amp fuses that are not user-serviceable without voiding the warranty. When using the M754 in a multi-amp system, we strongly recommend installing an in-line 60-amp fuse between the distribution block and the amplifier.

Sound Ordnance M75-4 75W x 4 Car Amplifier

                The ultimate combo: small size, big power, and serious sonic control.

Product Highlights:

  • 4-channel car amplifier
  • 75 watts RMS x 4 at 4 ohms (110 watts RMS x 4 at 2 ohms)
  • 160 watts RMS x 2 bridged at 4 ohms (4-ohm stable bridged)
  • Class D amp technology
  • variable high- and low-pass filters (50-750 Hz, 12 dB/octave)
  • variable bass boost (0-12 dB at 45 Hz)
  • preamp inputs
  • cooling fan
  • 8-gauge power and ground leads and a 60-amp fuse recommended — wiring and hardware not included with amplifier
  • no user-serviceable onboard fuses — when installing multiple amps in a system, an additional 60-amp in-line fuse between the distribution block and the amplifier is recommended
  • 7-1/2"W (8-1/4" with wiring) x 2-1/16"H x 4-3/4"D
  • warranty: 3 years
  • Our 60-day money-back guarantee

What's in the Box:

  • 4-Channel amplifier
  • 3mm Allen wrench
  • Four 3/8" Self-tapping screws
  • 4 Split lock washers
  • 4 Flat washers
  • Owner's Manual

Powered my speakers great for 3 years and a week. The warranty is 3 years. It quit yesterday lost 3 of 4 channels.

John, Tupelo, MS

Reviews

Sound Ordnance M75-4 Reviews

Average Customer Review(s):

(102 Reviews)

Great amp (so far) for the $

Steve from San Antonio, TX on 1/3/2019

Crutchfield Customer Review (What's this?)

Great little amp so far, drives my speakers very nicely. Had to turn the gain almost off in order to get my volume to 75% of head unit's max. Took a star off because of the speaker connection block. I found this style terminal block hard to work with. Additionally it would be nice if SO had a website with install tips/tricks for different vehicles/locations. Also was an "open box" unit...

Pros: Easy to install, good set up directions, sounds awesome.

Cons: Speaker terminal block hard to use

Tahoe amp.

John from Tupelo, MS on 12/24/2018

Crutchfield Customer Review (What's this?)

Powered my speakers great for 3 years and a week. The warranty is 3 years. It quit yesterday lost 3 of 4 channels.

Pros: Sounded great

Cons: Quit yesterday

Sound Ordnance M75-4

Guest from Faber, VA on 11/12/2018

so far so good

Pros:

Cons:

This one's the bomb! Get it? Sound Ordance?

Ronald from Peoria, AZ on 10/21/2018

Crutchfield Customer Review (What's this?)

Easy install; definately beefed up the sound from stock (aftermarket) head unit! Adjustments where precise and clear.

Pros: Compact, easy install, stays cool, great upgrade.

Cons: Instruction manual a bit weak but easy enough to figure out.

Good little amp

Sebastien from Knoxville, TN on 10/13/2018

Crutchfield Customer Review (What's this?)

Good little amp. I don't know if it is because I already have good after market speakers but the difference isn't as noticeable as expected. It is good but nothing crazy.

Pros: Small. Has a fan to cool down

Cons: You need to fix the amp on an hard flat surface (plywood) to let the air go under the amp for the fan. Also, the access to fix the amp on a flat surface is not the most convenient. Not as powerful as expected.

Clear sound. Loud

Shade from Lakeland, FL on 10/3/2018

Crutchfield Customer Review (What's this?)

Good little amp, powers my speakers beautifully. with a good clean sound

Pros: Loud, Clear sound from a built in cross over

Cons: screw placement when connecting the speaker wire input

Sound Ordnance M75-4

james from Richland, MS on 9/24/2018

Crutchfield Customer Review (What's this?)

great sound from an amp with a small footprint.

Pros: great clean sound

Cons: speaker wire hookups a little difficult to get to. they are under the bottom of the unit

Sound Ordnance M75-4

Chase from Harbor Springs, MI on 9/24/2018

Crutchfield Customer Review (What's this?)

Sounds very good! Green connectors on the back are a bit finnicky but nothing went wrong at all! Great amp, not name brand, but for my first amp, it works great!

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Sound Ordnance M75-4

Crutchfield customer from Alexandria, VA on 9/18/2018

Crutchfield Customer Review (What's this?)

Working good to drive 4 6.5" speakers. Very happy!

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Sort Far, So Good!

Craig from Princeton, IL on 9/4/2018

Crutchfield Customer Review (What's this?)

I have only had this hooked up for a week now, but so far, I am very satisfied.

Pros: Price, easy to hide.

Cons: None yet.

Excellent amp

Crutchfield customer from Jacksonville, FL on 8/9/2018

Crutchfield Customer Review (What's this?)

This amp makes everything better. It's tiny but packs a punch. I used some Velcro backing and attached it to the carpet in my truck instead of using the tiny screws they gave me in the box.

Pros: Small size Powerful

Cons: None yet!

Great Mini amp!

Jason from San Angelo, TX. on 8/2/2018

Crutchfield Customer Review (What's this?)

The amp is great on the eyes, small in footprint. Settings are clear and easy to get to. Wiring is a little difficult as the input screws are located under it but feasible. Luckily the plug can be removed to do the wiring. I do like the fan, but if put on a flat surface or carpet there will be no air flow, as it is located on the bottom of the amp. It fit under my passenger seat with no problems.

Pros: high pass and low pass crossover built-in size is excellent for hard mounting locations good power for the price has a built-in fan!

Cons: speaker wire inputs are small and hard to get to unless you remove the inputs terminal its self fan built on the bottom, not good for flat surface as will not get air flow

No luck with SO

Ricky from Navarre, FL on 7/21/2018

Crutchfield Customer Review (What's this?)

Lot of good reviews. Out of the box, i would have given it a great review. Little over a year later, Not so much. I received this amp after a SO 4 channel amp went bad on me. This was the new 4 channel at the time of the swap, so i was pretty stoked at the time. Now little over year later same problem, channel 3 and 4 not working and channel 1 and 2 are intermittent if you tap on the x-over switch. A jeep is not the best environment for audio equipment, so this amp may be great in a sealed car or left in the box on a shelf. No slam on Crutchfield, these guys are great and will be ordering again from them soon. Im just staying away from Sound Ordinances products. By the way, who even makes Sound Ordinance? Right!..... that's probably the first question i should have asked.

Pros: Great company to buy from

Cons: Below average product

Get off that fence and buy this amp already!

Mike from Sacramento, CA on 7/20/2018

Crutchfield Customer Review (What's this?)

If you are on the fence on this one, get off! First, it cant be very comfy and second S/O makes the "best" products for the money I have ever been fortunate enough to come across. I started with one enclosed 12" sub with the most amazing fit finish and ungodly tight bass that I bought 2 more the day after installing the first. I am currently running that sub with a bridged 2 channel 1000 Watt JBL amp. With gain at 3/4 I can not make that sub crack under load!!!! So for chuckles and grins I bought this amp for far less cash and used a line driver and no difference between it and the JBL. I am sure you were expecting me to be biased and say that it hit harder, louder and cleaner. It did not. Why is this a good thing? Because, it was half the price, it's a 4 channel amp, (which can be bridged to 2 channels) and only 150 watts with that set up and I could not tell the difference from the much more expensive and much much larger 1000 Watt JBL. So do the math. I have yet to make it jump into protection mode which was an ongoing issue with the JBL (constantly had to adjust the remote gain knob on the line driver). But not anymore with this amp. And it has a nice quality chrome finish that looks great with the lights in my trunk. Thank you a thousand times Crutchfield for introducing me to an amazing product line at an even more amazing price!

Pros: Everything

Cons: Are you serious? Did you even read my review?

Sound Ordnance M75-4

Crutchfield customer from Corpus Christi, TX on 7/1/2018

Crutchfield Customer Review (What's this?)

This amp sounds wayyyy better than I expected!!!

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Small amp, good performance

Don from Chino Hills, CA on 6/25/2018

Crutchfield Customer Review (What's this?)

A lot of performance for the money. Upgraded front speakers with 5" Polks and added 6x9's in self built boxes in back. This amp cranked the speakers up and added a lot of base to the rear. It fits under the front seat, but mounting screw locations are hard to access since they are tight against amp body.

Pros: Small Good power Great base

Cons: Screw mounts close to body Speaker wire connections on amp not labeled. Make sure to have directions nearby as you hook up speaker wires.

Bought 2 since it was so dang good

Travis from Springdale, AR on 6/17/2018

Crutchfield Customer Review (What's this?)

I love this amp, it's power, it sounds great, adjustable sound settings and it's fan cooled. This is my second one. I bought a additional one for my other truck because the first one was so impressive!

Pros: Sound, size, settings, fan cooled, quality, bridge-able

Cons: Yet to find one

Nice amp!

Robert from Paso Robles, CA on 6/15/2018

Crutchfield Customer Review (What's this?)

Nice power for my 6x9s.

Pros: Good power, compact size!!

Cons: None

Sound Ordnance M75-4

Crutchfield customer from Aberdeen, MS on 6/7/2018

Crutchfield Customer Review (What's this?)

Good sound, but it takes a second to cut on and channel 1 has low "thud" sound every now and then.

Pros: Good sound Small size, easy to tuck away.

Cons: Thud sound in channel one every now and then. Takes a second to cut on.

Sound Ordnance M75-4

P from Saint Louis, MO on 6/5/2018

Crutchfield Customer Review (What's this?)

Great amp for the price

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Cons:

Sound Ordnance M75-4

Crutchfield customer from Prescott Valley, AZ on 5/23/2018

Crutchfield Customer Review (What's this?)

now i can here the speakers with the top down in my 2018 Jeep JK. very easy to install and adjust for many music styles.

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Sound Ordnance M75-4

Craig from Milton, VT on 5/21/2018

Crutchfield Customer Review (What's this?)

install easy, sounds great, output perfect for the speakers chosen

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Cons:

Sound Ordnance M75-4

Crutchfield customer from Denver, CO on 5/6/2018

Crutchfield Customer Review (What's this?)

Provides more than enough power for new pioneer speakers in my '98 f150 and the size gave me flexibility in placement not afforded by other models in the same price/wattage range. A nice little amp.

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Sound Ordnance M75-4

Crutchfield customer from Windsor, VA on 5/2/2018

Crutchfield Customer Review (What's this?)

Compact little amp! Great sound!

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Sound Ordnance M75-4

James from Roswell, NM on 4/25/2018

Crutchfield Customer Review (What's this?)

Love it

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Cons:

Kicks butt

David from Covington, LA on 4/22/2018

Crutchfield Customer Review (What's this?)

Installed in my son's 2003 ford taurus ses. I paired with 4 each pioneer 4 way 6x8 350 watt and it sounds awesome! My son was very happy ??.

Pros: Great for door speakers!

Cons: None

Sound Ordnance M75-4

Nicholas from Cleveland Hts, OH on 4/15/2018

Crutchfield Customer Review (What's this?)

This is a great amplifier. It's compact enough to fit anywhere, puts out more than enough to power two 6.5s on separate channels a 4ohm 10 bridged. Couldn't be more pleased.

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Sound Ordnance M75-4

Patrick from Kent, WA on 4/4/2018

Crutchfield Customer Review (What's this?)

Small package, good ratings, sound is decent. I haven't had a lot of time listening yet, but so far it's good for what I'm using it for.

Pros: Small footprint, good power.

Cons: Speaker wire connectors are labeled oddly

Big power in a little amp.

Juan Salazar from Humble, TX on 3/29/2018

Crutchfield Customer Review (What's this?)

I was not sure about buying this amp but I went ahead and tried it. This little amp Rocks!!! I'm running 4 6x9 Jbl 939. It sounds so clean I'm impressed. I read about the speaker connector and I really didn't have any problems. I like that you can take part of the speaker connector and tie your speaker cables to it before installing the amp.

Pros: Super small Clean sound Powerful

Cons: Don't have anything to said

Sound Ordnance M75-4

Crutchfield customer from Wilmington, NC on 3/24/2018

Crutchfield Customer Review (What's this?)

I bought this amp, though skeptical at first, and am amazed. This little amp packs a pretty good punch. I have it pushing the Bose factory speakers and a 12 inch Kicker comp in my 2003 Miata. It's more than enough power and sounds great. Thanks Crutchfield.

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Sound Ordnance M75-4

Daniel from Morristown, TN on 3/20/2018

Crutchfield Customer Review (What's this?)

Love this little amp! It powers the Focal ISS 165 compent and rear ISS 165 2-Ways in rear! Works great! Perfect size and price! Second one I have bought. It also makes the PERFECT upgrade to a 5th Gen Camaro w/ JBL OE system!

Pros: Size and power w/ 4 channels at a great price

Cons: Other than no user servicable fuse I have none. ADD this SO!!

Sound Ordnance M75-4

Crutchfield customer from Portage, MI on 3/4/2018

Crutchfield Customer Review (What's this?)

Power as promised, gives my 4 Kicker speakers the punch I wanted so my knobby tires are not the chorus to songs anymore. Killing road noise in a Wrangler is not the easiest of of tasks and this amp did it.

Pros: Power, size

Cons: Internal fuses

Great affordable amp

Kevin from Washington, IL on 2/5/2018

Crutchfield Customer Review (What's this?)

I love this amp. If you're looking for an affordable, easy amp to upgrade you sound, this is the one to buy. I was concerned with the small size when I got it, but once I heard it, all my worries went away

Pros: Great sound, compact size

Cons: Wiring is a little hard, due to the size

Lots of power

Rod from Dawsonville, GA on 1/26/2018

Crutchfield Customer Review (What's this?)

This little amp really packs a punch. Small enough to mount just about anywhere. Really surprised at the power it produces. My old truck sounds great! If there's a negative, the 4 mounting holes are tucked up "inside" the casing of the amp, which makes mounting a little tricky. But that's the price of being a small amp I guess. Would've been better to have the 4 mounting holes extend outside the amp casing. This SO amp is pushing a pair of 6x9 3 way Kickers and a pair of 6x8 Kenwoods and does it very well. Overall, I highly recommend it.

Pros: Size, controls, power, sound

Cons: If you're all thumbs or have big hands, could be a little cumbersum when mounting and attaching speaker wires.

Sound Ordnance M75-4

Phillip from Dickinson, ND on 12/17/2017

Crutchfield Customer Review (What's this?)

Right now 5 stars will update after a while of running it. Got this to power 2 setz of JBL 600 components for my 08 Silverado. Love the size and the fact it has a cooling fan. Heres to hoping for awesomeness.

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Sound Ordnance M75-4

Scott from Milton, FL on 11/28/2017

Crutchfield Customer Review (What's this?)

Fantastic amp. Installed in a 2005 Jeep Wrangler. Sounds amazing.

Pros: Great

Cons: None

Solid

Jason from Parker, CO on 11/15/2017

Crutchfield Customer Review (What's this?)

This is a great little amp in a small footprint. I've got it wired with all the main speakers in series (my car presented 3ohms / channel) on the front, and bridged for a sub on the rear channel. I'm not using the bass EQ at all as I've driving an 8" Pioneer sub in a small enclosure. At first the sound was terrible, but that was because of ground loop issues, so after installing a pair of isolators (also from Crutchfield), this amp really came to life. Solid

Pros: small footprint, the right power for what I needed

Cons: The pots to adjust the amp are close to the RCA connectors, and in my install they are kinda hard to get to. Would have been nice to have them elsewhere (like on the top) but that is just a nitpick!

Sound Ordnance M75-4

Muhannah Wilkinson from Harvey, LA on 11/14/2017

Crutchfield Customer Review (What's this?)

I know I read some reviews on this amplifier about the mounting location of the speaker wire but speaking to D and he insisted that this was a good amplifier to push my focal ISS 570 s and my focal 570 AC performance speakers at first I was a little skeptical but after the install man all I can say is wow this is a great combination that was put together and also the compact size of the amplifier allowed me to install under my rear seat with no room lost in the cab of my vehicle all I can say is excellent choice Jo

Pros: Compact size makes for easy installation and easy to hide

Cons: None

Would recommend

Crutchfield customer from Brooksville, FL on 10/10/2017

Crutchfield Customer Review (What's this?)

I would give it five stars but it gives out just before the sound peeks at its best. Still a very good amp at the price. Really gives the music a good tone, just needs a bit more power. If your not looking for loud this would be a good amp.

Pros: Gives good tone to the music.

Cons: Needs just a little more power, like 100-125 watts.

Sound Ordnance M75-4

Michael from Calhoun, La on 10/8/2017

Crutchfield Customer Review (What's this?)

So far so good on this amp. Priced right and provides enough juice for my four mid range speakers @ 75 watts per channel.

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Sound Ordnance M75-4

Jody from Texas on 9/27/2017

Crutchfield Customer Review (What's this?)

Great amp for the price. Wish they had a little more powerful compact 4 channel, 100-125 watts, so you could cut the gain back to avoid distortion & still get the full potential of premium speakers.

Pros: Compact size fits under almost any seat. Affordable price.

Cons: THD is on the high end but can't expect much better for a budget. Keep gain cut back to stay distortion free.

Small Size -Big Sound

Mark from Dallas, TX on 9/25/2017

Crutchfield Customer Review (What's this?)

I was very pleasantly surprised at the small size but amazing sound this amp provides. Two thumbs up!

Pros: Small size won't eat up interior space

Cons: None come to mind

Perfect small amp

Zach from Chicago, IL on 9/18/2017

Crutchfield Customer Review (What's this?)

does exactly what i need it to do. I have 4 kenwood door speakers that i paid 40 and 50 per pair and they sound like high quality speakers. This is comoared to the old amp where it made it sound groggy.

Pros: Gives great power, no noise, no heat, small, comes with sticker

Cons: None

Great price for what I needed

Scott from Sacramento, CA on 9/8/2017

Crutchfield Customer Review (What's this?)

Sounds great. Nice and compact to hide easier.

Pros: Small, sounds great.

Cons: None

Sound Ordnance M75-4

Felix from San Antonio, TX on 8/24/2017

Crutchfield Customer Review (What's this?)

Awesome little amp! With amp and radio (kdc-x701) tuned to play distortion free at max volume, it does a heck of a job pushing a pair of Infinty 6.5 components (REF-6520cx) and a pair of 6x8 coaxials (Infinity REF-8602cfx).

Pros: power for price and size

Cons: none

Sound Ordnance M75-4

Crutchfield customer from Oceanside, CA on 7/20/2017

Crutchfield Customer Review (What's this?)

Good power, good price, easy to install, small and doesn't require a lot of space.

Pros:

Cons:

Absolutely Legit.

Chris from Riverside , MO on 7/2/2017

Using this to power up a set of Image Dynamics CTX6.5cs comps front sound stage only and I must say that this amp is legit . Super clean sound even at full tilt volume , why pay more for the bigger brands when this does the job just as good . Do yourself a favor and try Sound Ordinance amps , I doubt you'll be disappointed.

Pros: Price point , compact , super clean , plenty of power . 3 yr warranty.

Cons: None yet

Powerful / great value with 2 flaws

Mark from North Plainfield, NJ on 6/5/2017

Crutchfield Customer Review (What's this?)

Small size, powerful clean sound, great value. There are 2 problems I have with this amp. The speaker harness needs to be wider. The holes where you connect each speaker wire into the harness is too close together making installation more difficult then it needs to be. The second problem is every time you turn the amp off it makes a single pop sound thru the speakers. I've had 2 other amps from different brands that did not make any noise when turning off. I would rate this amp 5 stars if it were not for those 2 problems.

Pros: Small size, powerful clean sound, great value

Cons: speaker harness needs to be wider for easier installation, speakers pop when amp turns off.

Sound Ordnance M75-4

Crutchfield customer from Portage, IN on 6/5/2017

Crutchfield Customer Review (What's this?)

Great sound for the size and price. I have had this in my Jeep for 2 weeks and have no complaints so far.

Pros: great sound and small size

Cons: wiring diagram is not well done

Compact & Clean

Aaron from Kansas City, MO on 5/19/2017

Crutchfield Customer Review (What's this?)

Love this lil amplifier. Extremely small footprint, class D, crisp clean powerful sound from 2 JBL components and 2 JBL 6x9s.

Pros: Clean power, extremely small footprint, great value.

Cons: None

Sound Ordnance M75-4

Crutchfield customer from Pinson, AL on 5/8/2017

Crutchfield Customer Review (What's this?)

Wiring diagram is pathetic. Mounting screws supplied and thats it. Performance is average so far

Pros:

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Great bang for

Crutchfield customer from Houston, Tx on 5/2/2017

Crutchfield Customer Review (What's this?)

Small footprint and small package made this work well for my Harley. So far very pleased with power output and crossover controls. Wished it had a 2/4 channel switch, running in bridged mode having to use a y adapter and split my inputs.

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Looks way to good to hide !

Florian from Salt Lake City, UT on 4/24/2017

Crutchfield Customer Review (What's this?)

I use this amp in my travel van to control 4 speaker pairs in a total of 7 speaker pairs. So I own a concert hall on wheels, absolutely great sound :-) The amp gives me an incredible control to balance the 4 speaker pairs and the 3 speaker pairs controlled by the dash radio. I'm still experimenting to find the right balance, it's kind of time consuming to fiddle around with the many controls. Nice is the option to use the amp just as amp or to control speakers as kind of subwoofer using the cross over options. The amp gives you a lot for the price you pay. Would buy it again without a question.

Pros: I love the fact that you can control the level separately for Channel 1&2 resp Channel 3&4. This gives me total control over the 3 speaker pairs controlled by the dash radio and the 4 speaker pairs controlled by the amp. Really looks very good, I'm kind of sorry to hide this "beauty*

Cons: I read the fuse is within the amp, how to I replace the fuse without opening the case and voiding the warranty?

Sound Ordnance M75-4

al from Edison, NJ on 4/24/2017

Crutchfield Customer Review (What's this?)

this amp is great,made my speakers come to live,small investment big return on sound

Pros:

Cons: not so far

Sound Ordnance M75-4

Crutchfield customer from Anacortes, WA on 4/18/2017

Crutchfield Customer Review (What's this?)

I've had this amp installed for just over a month now, and I've had zero issues or complaints. Great sound from a 75x4, and small enough to hide just about anywhere!

Pros:

Cons:

It Works!!

Rick from Fishers, IN on 4/9/2017

Crutchfield Customer Review (What's this?)

A OK! Works and does what it's supposed to.

Pros: Good quality, Good price

Cons: None so far.

AWESOME Product!!!

Don from Helotes, TX on 4/8/2017

Crutchfield Customer Review (What's this?)

Perfect size, easy to hide under dash! Easy to hook-up and performs flawlessly! AWESOME product!!!

Pros: Compact size very easy to put in small areas, easy to install, sounds awesome.

Cons: None I've found!!!

Perfect fit

Todd from Orlando, FL on 3/29/2017

Crutchfield Customer Review (What's this?)

Awesome power for the size and cost. Perfect fit in my ST

Pros: Size, power, efficiency

Cons:

Sound Ordnance M75-4

Crutchfield customer from Denver, CO on 3/10/2017

Crutchfield Customer Review (What's this?)

Nice compact unit easy to hide, and easy to install. This is my second S/O amp I would buy again if I had another project!

Pros: Small

Cons: Heavy

Sound Ordnance M75-4

Harry from Jonesboro, GA on 3/8/2017

Crutchfield Customer Review (What's this?)

I have just had this Amp installed and have not really had time to review. However I have a Sound Ordnance 8" powered Sub which is small and fits very well under my rear seat and sounds very good, so I'm sure that the Amp will also be good. I would recommend Sound Ordnance Products to anyone looking for good products at reasonable prices.

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Sound Ordinance M-75 4 channel amp

Hal from Pearl Ms. on 2/18/2017

Crutchfield Customer Review (What's this?)

The Sound Ordinance M-75 4 channel amp is unreal.It is compact,fits pretty much anywhere you want to mount it. It will also blow your mind with so much clean power,the Allman Brothers have never sounded better! I absolutely love it. 10 stars.Thanks Crutchfield Team. Hal

Pros: Small,super easy installation, no background noise,just pure clean power! Awesome amplifier.Thanks Crutchfield.

Cons: Zero.

Nice little powerhouse!

Mike from Houston, TX on 2/13/2017

Crutchfield Customer Review (What's this?)

Packs a lot of punch into a very small package! Included filters are a nice touch. Fit easily under the front seat. The speaker harness is removable for easier wiring, which is a great feature (especially for those of us with big hands). Couple of minor issues: The channels are labeled CH1,2,3,4 - not your typical front left/right, rear/left right. Was a tad confusing at first, but easily figured out (one of the wiring diagrams in the manual has +/- backwards - no big deal if you just look at the amp itself). Fuses are internal and opening the amp voids the warranty - not ideal, but with Crutchfield's customer service it's not a huge worry. Even tuned down it's too much for the Pioneer speakers currently installed in my Jeep. Good news for me - I get to upgrade!

Pros: Small footprint; powerful; removable harness; solid construction

Cons: Channel labels; internal fuses

Compact Monster!

Jim from Surprise, AZ on 2/11/2017

Crutchfield Customer Review (What's this?)

Totally impressed with this amp. I was skeptical at first because it's a name I didn't recognize but I took a chance based on the performance numbers and other reviews of the amp and I'm glad I bought it. This little thing jams. I have it pushing a pair of Polk DB 6x9s and a pair of Polk DB 6.5s. Once I got the amp dialed in and the tuner equalized I was absolutely amazed at the clean power this thing lays down. Those Polks SCREAM with this little monster! Sound quality is outstanding. The highs are crisp without being piercing. The mids are warm and not muddy. And the bass even at volume is smooth and tight at the same time. I have this paired with a Sound Ordnance M350-1 pushing a Fosgate 10" P2D4 wired at 2ohms in a sealed box and it's a perfect match for the Polks and the M75-4. As always, Crutchfield service and quality is outstanding. Love my system!

Pros: Powerful, clean/quality sound, small form factor, fan cooled (almost silent)

Cons: None so far.

S.O. amp

Lance from Velva, ND on 2/3/2017

Crutchfield Customer Review (What's this?)

Soun is outstanding. Such a compact amp and I love the adjustability of the crossover. Would definitely buy another one.

Pros: Small, very clean sound. The crossover adjustment in front and power and speakers hookups in the back.

Cons: Speaker connection screws are on the bottom. So you need to install the speaker wires before mounting the amp permanently.

Sound Ordnance M75-4

Crutchfield customer from Ogdensburg, NY on 1/31/2017

Crutchfield Customer Review (What's this?)

Good sound from a little package. Install was a bit of a pain. You have to attach all the wires before securing it to the surface due to weird placement of securing screws for the wires. Other than that, I'm happy

Pros:

Cons:

Decent for price

R from Az on 1/30/2017

Crutchfield Customer Review (What's this?)

Decent amp for dollar. Does distort a bit but all in all good deal. And small profile fits in tight places.

Pros: Small and inexpensive

Cons: Distorts some at mid to high volume .

nice boom for a little amp,,love it

pete from budd lake, NJ on 1/18/2017

Crutchfield Customer Review (What's this?)

i set this amp up with my 2 rear deck speakers and my new 10 inch alpine sub,,and i was very impressed

Pros: great price, great sound and great help from all of the crutchfield team,,, thanks

Cons: no cons

Sound Ordnance M75-4

Crutchfield customer from Sarasota, FL on 12/21/2016

Crutchfield Customer Review (What's this?)

A big punch in a small package. Fills my Mini Cooper with robust sound! Great value for the money!

Pros:

Cons:

Sounds Great

Steven from Tennessee on 12/7/2016

Crutchfield Customer Review (What's this?)

Just had it installed in my 2003 Accord Coupe with stock head unit, 2 Kicker 6x9's in the rear, and 2 Kickers in the doors. Fit under the driver's seat--its very small. Sounds Loud and Clear. Thanks for the advice Crutchfield!

Pros: Low cost, sounds great

Cons: none, yet

Good amp, small footprint

Mike from Greater Memphis TN area on 11/29/2016

Crutchfield Customer Review (What's this?)

I recently installed this amp. It has good power and a small footprint. After about an hour it's pretty warm, but not hot. The fan is mounted on the bottom of the amp. This amp is pushing two pair of JBL GX600C with no problems. I cannot hear any amp noise in my speakers.

Pros: Good power, small footprint, 4-channel, price, 3 year warranty

Cons: Have not found any...

Great purchase

Conner from NY on 11/18/2016

Crutchfield Customer Review (What's this?)

Great buy, powers my 2 Rockford Phosgate 6.5" and 2 Rockford Phosgate 6x9" very well.

Pros: Sounds great, easy installation and adjustment, and for a really good price. Instructions were pretty clear on how to properly wire it up.

Cons: A little weird fitting a fat ground cable into the ground receptacle, but I could always just use a smaller gage wire to make it fit better.

Sound Ordnance M75-4

Steven C from Hartford, CT on 11/16/2016

Crutchfield Customer Review (What's this?)

This amp does a great job pushing my Alpine SPR-68. Have no problem turning up the volume.

Pros: Quiet, easy to install.

Cons: Haven't found any YET.

Sound Ordnance M75-4

Randy from Polk city fl on 10/23/2016

Crutchfield Customer Review (What's this?)

Perfect size to power ratio. I have a jeep, not much room to mount an amp. This fits behind my glove box. Running 4 pioneer 3way 6.5 and a 8" sub bridged off the stock radio

Pros: Size power

Cons: None

small and powerful

jt 32 from Oviedo, FL on 9/19/2016

Crutchfield Customer Review (What's this?)

Small powerful and good looks

Pros:

Cons:

Don't let the price fool you- great quality and power

John from Sierra Vista, AZ on 8/1/2016

Crutchfield Customer Review (What's this?)

I took a chance on this amp because it is compact and had good specs. It definitely delivers the goods, and is super quiet (no hums or fan noise.) I am pushing a set of component speakers and an 8" sub with great results. My only beef is with the speaker outputs.

Pros: Small footprint, dirt cheap power, looks nice, 3 yr warranty.

Cons: You have to remove the amp from its mounting shelf if you want to disconnect or reconfigure the speaker wires. The screws that tighten them are mounted upside down.

SO Rocks

Crutchfield customer from Nashville on 7/19/2016

Crutchfield Customer Review (What's this?)

Really great amp. Easy install and great cranking power. Thru it in the 02 wrangler and the entire neighborhood can hear as I drive with the top off. Only con and it's a small one was the speaker connections and their proximity to the screw holes for holding down the unit itself. Very tight but made it all work

Pros: Great power good price easy install

Cons: Tight area for speaker connections and screw down of the unit.

Nice little Amp

joseph from Grand Island, NY on 7/14/2016

Crutchfield Customer Review (What's this?)

This is a nice compact amp. I installed it in my boat and it really powers my 6x9s nicely as well as a pair of 5s. The fan started making loud whining noises but the good people at Crutchfield sent me a replacement next day. Very please with the service and new amp.

Pros: Compact, loud, easy to install.

Cons: Cooling fan malfunctioned after a weeks use.

Powers Six Alpine 5X7 Speakers With Ease

Chuck R. from Walnut Creek, CA on 7/6/2016

Crutchfield Customer Review (What's this?)

The amp powers up six Alpine 5X7 speakers with ease, is extremely small and has many options to control output which makes it very flexible overall. Very nice unit especially for the price.

Pros: Small Powerful Numerous settings available Great price

Cons: None

Sound Ordnance M75-4

Ancient Mariner from Bainbridge Island, WA on 6/19/2016

Crutchfield Customer Review (What's this?)

I know that new amps can need some break in time to sound their best, but this one was very good right out of the box. Despite the howitser graphic on the box, there is more to this amp than boom. The M75 drives my JBL bookshelves and subwoofer nicely. All the music comes shining through in detail and with a good soundstage to boot.

Pros: small size, efficiency, musicality

Cons: none

Boat

Crutchfield customer from Spencer, NY on 6/15/2016

Crutchfield Customer Review (What's this?)

Outstanding

Pros:

Cons:

Nice Amp ????????

Osiris from Bronx, NY on 5/27/2016

Crutchfield Customer Review (What's this?)

Great sound

Pros:

Cons:

Wow...Better than the JL Audio amp it replaced

James from Garner, NC on 5/18/2016

Crutchfield Customer Review (What's this?)

This little amp might fool you....It did me. I replaced a 4 channel JL Audio amp of similar RMS with this unit because of the price. Well, this little thing rocks. Driving a bridged Pioneer slim series 10" sub and a pair of Alpine SPR 6's it is amazing. I was thinking I would end up getting a mono for the sub but it has been so clean that I stopped right where I am.

Pros: Small, Great Power, Clean, Ability to set up in multiple configurations

Cons: None

Sound Ordnance M75-4

Kevin from Homestead, FL on 5/15/2016

Crutchfield Customer Review (What's this?)

This amp helps the sound especially when the top comes off!

Pros:

Cons:

1999 Sea Ray 380 Sundancer

Travis from Broken Arrow, OK on 5/12/2016

Crutchfield Customer Review (What's this?)

Used to push 4 JL 6.5's and they sound amazing

Pros:

Cons:

M75-4 Amp Review

Crutchfield customer from lawton, OK on 3/29/2016

Crutchfield Customer Review (What's this?)

Compact yet powerful! Pushes my JL subwoofer with some kicker mids without a problem. Couldn't be happier.

Pros: Compact, Easy to connect, Powerful

Cons: Mounting it can be a little challenging (tiny screws and the holes to mount are close to the speaker connectors)

Awesome!

Shaun from Dallas, TX on 3/24/2016

Crutchfield Customer Review (What's this?)

I was skeptical when the support agent recommended this because I knew it was a house brand but I figured I would give it a shot. I am very happy I did! I have it paired with (4) 6x8 Infinity Reference speakers and the clarity and volume is excellent! I highly recommend!

Pros: Great value, power output, ease of installation. Size

Cons: None so far

Great little amp

Jason from liberty, SC on 3/21/2016

Crutchfield Customer Review (What's this?)

If you need a powerful amp and don't have much room to work with this would be a great option. I have this powering 4 6 1/2 300 watt kickers in my doors and they sound great. Actually to much power, I have the amp turned way down. Overall works for my needs and beyond.

Pros: Great for tight spaces and a ton of power.

Cons: Don't like the speaker terminals.

Great Bang for your Buck

Ty C from Ithaca, NY on 3/14/2016

Crutchfield Customer Review (What's this?)

The amp is just as advertised. Handles 4 60 Watt Kickers with no problem. My system now sounds incredible. I installed it under the passenger seat of my 1998 Nissan Sentra and you cannot see it. Also, installation is straightforward with any amp kit. The bass boost also works considerably well, although don't expect to feel any bumping unless you have a subwoofer. The one downside is that you need a screwdriver to adjust the EQs, and for my case this means taking off the passenger seat every time I want to fine tune.

Pros: Fair price, decent power rating, slim

Cons: Not super easy to adjust EQs

DOA

mark from union city ca on 3/11/2016

Crutchfield Customer Review (What's this?)

the amp didnt work when i took it to get installed...it didnt power up. i had to buy one where i got it installed because i didnt want to have to wait for new one to be sent.

Pros: its cheap

Cons: it didnt work...maybe the one i got was defected but because my jeep is complicated to open up the front dash speakers i didnt want the shop i had do the install have to close up the dash and then reopen when a new unit arrived so i bought one from them

Great bang for the buck

Leadsled Coupe from Greeneville TN on 2/29/2016

Crutchfield Customer Review (What's this?)

I gave it top marks as I greatly enjoy the improvement over my factory powered system - for the dollar spent! Not an audiophile here but wanted a. Improved system and this did exactly what I'd hoped for. Thanks Crutchfield!

Pros: Sound per dollar, easy install.

Cons: None.

Excellent value and quality

Bret from paradise, CA on 2/1/2016

Crutchfield Customer Review (What's this?)

Easy to install, high quality parts. This is my second Sound Ordance Amp. I love me both!

Pros: Quality Workmanship Clean power

Cons: None

Good value amp

XRider from Manati, PR on 1/7/2016

Crutchfield Customer Review (What's this?)

Nice features in a compact and well assembled package. This amp has the power I need to pump my speakers and a good price.

Pros: Power Low and high pass switches Versatility to bridge channels for 1, 2 or 4 speakers

Cons: No speaker level inputs.

Sound Ordnance M75-4

Ray from Utah on 1/4/2016

Crutchfield Customer Review (What's this?)

Well made. compact.

Pros:

Cons:

Amp replacement

Chubba from Massachusetts on 12/22/2015

Crutchfield Customer Review (What's this?)

Replaced an Infinity with this upon recommendation from Crutchfield. Smaller box, easy setup, efficient, clean signal, integraded well with existing speakers. Outstanding value. Better set up with separate single channel bass amp too.

Pros: Small, efficient, clean sound.

Cons: Connectors to speaker cables are good enough, but light, and plastic. Channel markings and diagram was minimal. Took time to associate front rear, left right correctly.

Awesome sound

Ernest from Illinois on 12/18/2015

Crutchfield Customer Review (What's this?)

Now installed I just can't believe the big power out of this space saving Amplifier. GREAT SOUND !!!

Pros: size, power and price

Cons: Non so far

Works great

Xavier from DC on 11/27/2015

Crutchfield Customer Review (What's this?)

It has been pushing the sound. So far seems to be a good product.

Pros: Cost

Cons: None so far

Sound Ordnance M75-4

Tim from West Virginia on 11/9/2015

Crutchfield Customer Review (What's this?)

Crutchfield is great to work with. Fast shipping Amp works like it say. Only been in about a week.

Pros: Powerful little box. Great warranty.

Cons: None yet

Great addition

Jet1959 from Liberty, Mo on 10/26/2015

Crutchfield Customer Review (What's this?)

This was a nice addition to my system. After following Crutchfield's amp setting site, I got the sound I deserved.

Pros: Everything

Cons: Mounting holes too close to unit and wires for drill and screw driver bit No mounting template

Why pay more?

Sourdough from Arizona on 10/11/2015

Crutchfield Customer Review (What's this?)

The amp is compact with internal fan to keep it Kool. It gives a serious boost to my door speakers of my crew cab truck. Now my door speakers can keep up with my sub box to give a balanced sound. For the price, it is hard to beat this little Sound Ordnance amp.

Pros: Small, internal fan, value

Cons: huh?

Sounds great!

acdcrulz from Kentucky on 9/29/2015

Crutchfield Customer Review (What's this?)

Amp sounds great! I replace a very nice Infinity amp with the Sound Ordnance amp. The sound quality is equally pleasing!

Pros: Very easy installation. Great sound quality.

Cons: none

M75-4

Ken from Wisconsin on 9/6/2015

Crutchfield Customer Review (What's this?)

I was a bit skeptical about purchasing this amp instead of a name brand unit. Glad I did! This amp replaced two 2-way amps that were old and deteriorated. Installation was easy due to the size of the unit. Great power and sound quality! Compared to what I had, this was a great upgrade to my system! Now It needs to stand the test of time. I'll let you know in about 10 years. The old pioneer amps lasted about 25 years!

Pros: Price, size, power and sound quality of the amp.

Cons: Instructions did not give any input amp rating spec. Had to go to the Crutchfield website to get the amp rating so that I could install the proper gauge wiring and fuse protection. (60 amp)

M75-4

Crutchfield customer from Maine on 8/2/2015

Crutchfield Customer Review (What's this?)

Great amp! I upgraded from the m-4050 and this this is more than half the size, more powerful, stays waaay cooler when being pushed. It may be the cheap amp but i think it sounds and functions just as well. I'd buy this amp again, but make sure you realize that this amp doesn't come with a preamp output so i had to buy a rca splitter. all in all this is a great compact amp that does exactly what it's supposed to do and does it well

Pros: Very small, powerful, stays cool

Cons: No preamp outputs :(

Details

Hands-on research

Product Research

Features
Connections

Features

Power Ratings: The Sound Ordnance M75-4 is a 4-channel Class D amplifier with an RMS power rating of 75 watts per channel into 4 ohms, and 110 watts per channel into 2 ohms. The amp can also be bridged into a 4-ohm load for a power rating of 160 watts (x 2). Power ratings are measured with an input power of 13.4 volts.

Crossovers: The M75-4 is equipped with independent crossovers for the front (channels 1 and 2) and rear (channels 3 and 4) channels. Each can be set to high-pass, low-pass, or full range. The crossover points are continuously variable from 50 to 750 Hz. The crossover slopes are 12dB per octave.

Bass Boost: The front and rear channels also have independent Bass EQ settings. The bass boost is continuously variable from 0 to +12 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.

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

Speaker Connections: The speaker terminal can be removed from the amp, which makes connecting the speaker wires easier. The terminal is mounted to the chassis of the amp with two screws. Bare speaker wire, up to 12-gauge, is held in place by screw-clamps on the terminal. A flat blade screwdriver (not supplied) is required to tighten/loosen the screw-clamps.

Signal Inputs: The amplifier has two pair of stereo RCA inputs, one for the front channels and one 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 (item number 120RCAY1, sold separately). Front-to-back fader capability is lost when using Y-adapters.

Fuses: The M75-4 is protected by two internal 30-amp ATM fuses, accessed by removing the bottom plate. However, removing the bottom plate voids the warranty, so the fuses are not user replaceable within the warranty period.

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 verify what’s in the box, 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.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

This product matched the RMS rating of the door speakers I currently have. It was priced for a cheaper budget, but also had a large number of positive reviews that made me feel comfortable in making this purchase. [ Jacob  Jan 17, 2019 ]
recommended by Mick [ Steven  Dec 27, 2018 ]
Needed an amp to fit under my front seat next to the SO m350. This will power my dsc6704 door speakers. If its anything like the m350 i already know im going to be happy. [ Bryan  Oct 26, 2018 ]
Best price and best options available. [ D  Oct 08, 2018 ]
Taking a chance [ Timothy  Sep 26, 2018 ]
Amplifier for aftermarket speakers [ Alec  Jul 24, 2018 ]
to replace one that is not working. [ DAVID  Jul 24, 2018 ]
Size and price, something new for a budget buiild [ Jason  Jul 18, 2018 ]
Performance details beat other name brand amps, warranty is one of the best and value. [ David  Jul 14, 2018 ]
Have two others. Work great! [ DANA M  Jun 25, 2018 ]
Kevin helped me with the choice [ ROMAN  May 10, 2018 ]
Hogan, was great and very knowledgeable and sold me on this amp. thank you [ WILL  May 08, 2018 ]
I just installed it in my son's car and liked it so I had to get one for myself. [ David  Apr 22, 2018 ]
Great reviews from customers [ David  Apr 09, 2018 ]
Good price, small size, positive reviews. [ VITALIY  Apr 07, 2018 ]
I have used a SOUND ORDINANCE powered subwoofer in the past and it was a quality item at an affordable price so I thought I would give the power amp a try [ JAMES D  Mar 31, 2018 ]
Small Compact Size With Amazing High Output and Very Versatile Setups! [ Matthew  Mar 29, 2018 ]
Advisor recommendation [ Rahul  Mar 23, 2018 ]
I've had other SO products and been happy with them for their intended price point. I have not tried one of their amps and thought this old truck project I have is a good chance to try one out. The M75-4 looks good on paper and is reasonably priced. Hopefully it delivers like their other products! [ Patrick  Mar 20, 2018 ]
best bang for buck! [ ANTHONY  Mar 14, 2018 ]
Primary reason is unit size and reviews. [ Paul  Mar 12, 2018 ]
Sonny Recommended [ Robert  Mar 12, 2018 ]
Power new larger speakers. [ William  Feb 08, 2018 ]
I chose this amp because of its output and mainly for its size. I need to install it inside the dash, and since it was fan cooled even better! [ Russell  Jan 31, 2018 ]
For better cleaner sound with factory system and of course to be louder !! [ BRUCE  Jan 13, 2018 ]
Suggested by Crutchfield expert for my application. [ DEREK  Dec 29, 2017 ]
small size ,cooling fan [ Dave  Dec 09, 2017 ]
Research [ JAMES  Dec 05, 2017 ]
Need a compact 4 ch amp and Tom recommended this one [ Phillip  Dec 04, 2017 ]
Advisor recommended [ CHRISTOPHER  Nov 30, 2017 ]
Compact enough for my install, powerful enough for the 2 sets of components I chose, fan cooled, reasonably priced, good reviews. [ MICHAEL  Nov 25, 2017 ]
The price and reviews by other purchaser [ Jared  Nov 25, 2017 ]
I researched this Vs the Rockford Fosgate line both on Crutchfield as well as from other sources, and in nearly every single review I saw these compared favorably to better known brands such as Rockford Fosgate. With a 3 year warranty AND Crutchfield's lifetime customer support, I don't feel I could have a "better *BANG* for my buck". I am a professional auto tech w/30+ yrs exp, and every single vehicle of mine could be quantified as a "stereo on wheels!". Great way to NEVER have to hear rap! [ KCBon  Nov 21, 2017 ]
By far the highest signal to noise ratio of all the inexpensive amps on Crutchfield. And a higher wattage than all other Class D amps in its price range. [ James  Nov 16, 2017 ]
Crutchfield guy recommended [ Robert  Nov 15, 2017 ]
Value and price are excellent. We will see if the product performs to expectations. [ Keith  Nov 01, 2017 ]
Recommend from a friend [ Cody  Oct 16, 2017 ]
The finishing touch to my upgraded system in my Nissan Frontier. Replaced the head unit and all the speakers and now for the power. More than enough punch and cheap as chips. [ Robert  Oct 09, 2017 ]
compact and good price point [ Derek  Sep 29, 2017 ]
I think this is Crutchfield's house brand. While I would've rather bought an Alpine or JLAudio, this had good reviews AND it had a full set of controls on it. In particular I'm looking for gain settings which seem to be missing in most compact amps. Plus if it's backed by Crutchfield, that means a lot. [ H  Sep 05, 2017 ]
size wattage and price were all a match for my needs [ RICHARD PAUL  Aug 23, 2017 ]
The best advisor in the world recommended it as a replacement...Thanks Sam! [ Patrick  Aug 18, 2017 ]
I like the fact that its made in the USA and I already bought the M350-1 for my subs. I haven't got it installed, wired up and running yet but looked like some good quality stuff. should fit in my dash above my glove box. I like that they are fan cooled. I usually run a small computer fan or two on my amps for thermal protection. [ keith  Jul 29, 2017 ]
Great reviews and great price. [ Mack  Jul 17, 2017 ]
Small, inexpensive and good reviews. [ Randy  Jun 28, 2017 ]
Compact, lots of power, not alot of cost [ Mike  Jun 27, 2017 ]
Very reasonable price for the amount of sound you're getting. [ G  Jun 03, 2017 ]
This appears to be a great value with many features for the buck. The compact size will fit easily in my 2013 Miata and it's 2 Ohm stable which will work with the OEM Bose woofers. The plug terminal block is a nice touch. Reviews were solid. Crutchfield has always been great! [ Thomas  May 29, 2017 ]
This amp is a very great 4 channel amp for any factory or after market speakers to bring it to the next level. Very sleek design with a lot of options to modify your audio. [ Austin  May 23, 2017 ]
It has everything I need to run my speakers. I really like that it has a fan in it. It will be running infinity kappas 4x6 plates up front. And 6x9 polks in rear of car. Will be using a MTX crossover too. [ GREG  Apr 28, 2017 ]
Size, reviews, power and it's a class D 4 channel that fit my budget. [ Ken  Apr 28, 2017 ]
The technician I spoke with ( manny ) recommended this amp for my project . I feel good with it [ Ken  Apr 02, 2017 ]
Best price for the watts and channels. I heard some good things on a few car audio forums about Crutchfield's in house brand, so I thought I'd give them a try. [ Lucas Shaffer  Mar 29, 2017 ]
3 Years Warranty, great specifications [ Florian  Mar 26, 2017 ]
I chose the M75-4 Amp because of the reviews, size, options and value. [ Gregory  Mar 24, 2017 ]
Size and power [ MIKE  Mar 15, 2017 ]
Good reviews [ JOE  Mar 04, 2017 ]
advisor recommendation [ JEFF W  Mar 03, 2017 ]
perfectg little amp it makes good clean power. i would reccomend [ chris  Feb 15, 2017 ]
Customer Service rep's suggestion and with much better features than what I was going to purchase. Additionally it saved me some money which is always great! Thanks Cooper! [ Anthony J.  Feb 01, 2017 ]
It met the specifications I was looking for, had a great price, and the reviews were almost all 4-5 stars. [ Michal  Jan 31, 2017 ]
cheap good reviews [ JOSHUA S  Jan 30, 2017 ]
Great ratings at a low price [ Timothy Shane  Jan 27, 2017 ]
I believe the price is reasonable and I'd like to try this amplifier with my new component speakers just ordered. I loved the reviews of this product, so I am taking the opportunity to try this amp. Although I have a nice amplifier now. [ mark  Jan 24, 2017 ]
meets my needs [ A  Jan 21, 2017 ]
Needed a compact size to fit into my Miata's trunk, plus more than 40W/channel. [ Patrick  Jan 11, 2017 ]
Price value. Good reviews. Nice protection insurance. [ Dennys  Jan 08, 2017 ]
Its a great littel amp with a great warranty that runs great power into four channels. It runs cool and performs amazingly. What else can you ask for. Oh, a great price too? YOu get that too. [ LESLIE J  Dec 27, 2016 ]
Larry recommended this amplifier to match my Polk db652s and dxi6501s. I thought it was a good price and I like the size compared to others that are 3 times as big. Looking forward to getting this put in and finally wrapping this car system set-up up. This is my first install. It wasn't difficult, you just have to pay close attention to everything you do and follow every detail recommended. [ s  Dec 07, 2016 ]
good reviews price and compact size [ WILLIAM  Oct 31, 2016 ]
Recommendation from Tyler at Crutchfield as the best amp under $200 and it had great reviews. [ Michael  Sep 30, 2016 ]
Class "D" performance in a small inexpensive package. [ M  Sep 30, 2016 ]
It's affordable price [ Lance  Aug 26, 2016 ]
freind has one [ Roy  Jul 10, 2016 ]
have a mono amp by SO and love it [ DANA M  Jul 06, 2016 ]
Good price for power and small size. [ Kenneth  Jun 26, 2016 ]
Good review, small size for motorcycle install, class D, low heat. [ Bret  Jun 22, 2016 ]
Not sure I guess, price, maybe power. We'll see [ johnnie lee  Jun 18, 2016 ]
This will be used in the fairing of my Harley and I liked the idea that it ha a cooling fan. [ STEPHEN  Jun 12, 2016 ]
Size, power, and price. They all look good in regards to this amp. I had purchased the Sound Ordnance M-4050 but when I received it, I realized I hadn't anticipated how big it was in person. My Honda Element doesn't leave a lot of room on the floor to mount amps. My plan was to mount this amp and a small mono sub amp on either side of the rear door in the small cargo pockets. This will fit perfectly. I can't wait to get rolling! [ Michael  May 16, 2016 ]
good bang for buck [ Rick  Apr 23, 2016 ]
Recommended by Specialist, good reviews and has a fan to help prevent overheating. [ Harry  Apr 23, 2016 ]
sound like a great deal [ amos  Apr 04, 2016 ]
Quality, price, usability, and versatility. [ Jack  Mar 26, 2016 ]
I need 4 channel car amplifier that fits under my car seat. This product is small enough but has great power. [ HINDARMAN  Mar 10, 2016 ]
Great amp plenty of power [ Wayne  Feb 27, 2016 ]
Compact, power and price [ Robert V  Feb 23, 2016 ]
Powerfull and compact [ orlando fernand  Jan 31, 2016 ]
Great specs and warranty at a cheap prize. [ CARLOS R  Dec 23, 2015 ]
75 WATTS 4 CHANNEL, SHOULD GO WELL WITH THE POLK COMPONET SPEAKERS. MORE WHEN IT ALL GETS INSTALLED [ PAUL  Dec 15, 2015 ]
Great Amplifier with power and fits anywhere. [ ERNEST T  Dec 14, 2015 ]
Pleased with previous SO purchase [ Tony  Dec 09, 2015 ]

17 questions already asked

if you are talking about the remote wire,,then you have to look at the rear of your head unit,,there is a purplish wire that should have a little tag that says remote wire,,connect the wire to the back of head unit,,then run the remote wire to the amp,,,done [ Pete  Sep 14, 2018 ]
That's for the switched turn on lead from the radio itself. That way the amp is only powered on when the radio is on. On aftermarket stereos it's usually a blue wire in the wiring harness of the stereo itself. The 12v should come directly from the battery and the ground should be attached to the body of the vehicle close to the amplifier. [ Michal  Sep 14, 2018 ]
Check your wiring. The remote or input from the headunit should be in between the power and ground cable if that's you're asking. [ Steven  Sep 11, 2018 ]
That is the remote control connector. It will power on the amp when it receives +12v current. There should be an output on your radio for it. [ Benjamin  Sep 10, 2018 ]
Olathe output?? Hmm. I don't understand. You need a 12 volt battery system to run the amp. It's output is in watts. It's 75 Watts a channel and has 4 channels at 4ohms You can bridge down from there if you want to 2 channels. It's a nice amp for a beginner or basic system. It will give you very good sound at a pretty high volume just not a compatition amp [ DANA M  Apr 07, 2018 ]
If you're referring to the fader controls on your head unit, then that would affect the RCA outputs on your head unit. For more details or to discuss further, please feel free to contact an Advisor directly by phone (888.955.6000) or online chat. Thanks! [ Larry  Feb 06, 2018 ]  Staff
I don't even think it needs that much. A 12v power source from anywhere will work. I think it's 100 miliamps or something like that. The power cable that comes into it is actually what powers up the amp, the remote turn on just tells it to turn on. [ Austin  Feb 04, 2018 ]
That should be plenty. It technically turns on with a 12v input, but you can get away with 10-14 [ Jacob  Feb 03, 2018 ]
Sorry I don't know the answer but I do like the amp [ PATRICK  Feb 02, 2018 ]
I have no problem with amp turning on at 11 vdc [ DAVID  Feb 01, 2018 ]
Should be ok to run in any positon, as long as there is good air flow. [ ZEKE  Nov 20, 2017 ]
I run mine vertically with no issues. [ Ryan  Nov 20, 2017 ]
Yes, the Sound Ordnance M75-4 amp will support one pair of 2-ohm speakers and one pair of 4-ohm speakers connected to the front and rear channels. For more specific details about that, please feel free to contact an Advisor directly by phone (888.955.6000) or online chat. Thanks! :) [ Larry  Oct 24, 2017 ]  Staff
The Sound Ordnance M-75 does not have any preamp outputs to "daisy chain" two of them together. If you would like to discuss further please feel free to contact an Advisor directly by phone (888.955.6000) or online chat. Thanks! [ Larry  Jun 13, 2017 ]  Staff
For additional 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. [ Kenny  Jun 02, 2017 ]  Staff
It is small, 4.25w by 2h by 7.25 deep inches [ Greg  Mar 01, 2017 ]
4-3/4" X7"X1" with 7" just make sure you leave room for your plug-ins on one end. Great little amp. Very happy with it. [ IRA  Mar 01, 2017 ]
Though we don't have anything "concrete" regarding how the S/N ratio is measured on the Sound Ordnance M75-4, our product researchers informed us that it was likely obtained from the rated power (75 watts RMS @ 4-ohm) at 1kHz; since that's how most non-CEA 2006 compliant amplifier's measure the S/N ratio. If you would like to discuss further, feel free to contact an Advisor directly by phone (1-800-324-9695) or online chat. [ Larry  Feb 07, 2017 ]  Staff
Yes [ DAVID  Feb 01, 2018 ]
Absolutely. You could power the pair of Alpine 6x8" with 2 of the channels and bridge the other two to power the subwoofer. You'll just need to wire the dual 2 Ohm coils in series to present a final 4 Ohm load to the bridged channel. I hope that helps! My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=5 [ Ryan  May 18, 2016 ]  Staff
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you. [ Kenny  Mar 05, 2016 ]  Staff
this is a 4 channel amp it will power your main speakers but not the sub [ ROBERT  Mar 04, 2016 ]
For me, this amp comfortably powers 4 speakers of similar caliber. It is crisp and clean. However it will not also power a sub at the same time. You can power 2 speakers and a sub, but not 4 + sub. In terms of the existing head unit, it has to have the ability to accommodate an external amp. My 2000 Jeep could not so I bought a new head unit. Running all of the wires through mounding, etc was time consuming and drilling a hole through my firewall to run the power to the battery was intimidating, but I did it all in about a day and am very pleased. [ Robert  Mar 04, 2016 ]
The Sound Ordnance amp will give your speakers the power they need even with your factory head. However, you'll need a separate amp to power the JBL sub. [ Joshua  Mar 03, 2016 ]
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. [ Kenny  Feb 24, 2016 ]  Staff
I'd have to say yes. Geek Squad was able to install this bad boy in a compartment in the lower part of my dashboard in a '07 Malibu. That leads me to believe the SO M75-4 fits just about anywhere. [ Joshua  Jan 15, 2016 ]
yes it will [ ROBERT  Jan 14, 2016 ]
Dimensions are 8 1/4" X 4 3/4" X 2 1/16" so this is a small package. I don't know how much room is under the seat of a JK Wrangler but I would say you have plenty of room. I mounted it on the waterfall space between the seats of my 1972 Corvette. Works very well and I love the features. I will tell you, get the speaker wires connected prior to mounting the amp down as you can not access the screws to the connector with it mounted. Really the only down side to the whole package! [ KimIN  Jan 13, 2016 ]
Absolutely!! It is a very small amp, but has plenty of power. I am very pleased with it, and would recommend it to anyone. Matt T [ Marilyn  Jan 13, 2016 ]
It fit under my driver seat in my 2013 wrangler jk fine, it's a small amp and works great! [ Julie  Jan 13, 2016 ]
Yes [ kenneth  Jan 13, 2016 ]
Im not really sure. It is pretty small. But, it does require room for ventilation. This thing is built well and works great. [ IRA  Jan 13, 2016 ]
I Believe it should. You will have to be careful with your wiring. My only complaint with the amp is that. With the size of the amp and having the wires enter on both ends increases the length of it by 3 - 4 inches [ Joe  Jan 13, 2016 ]
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