Sound Ordnance M75-4

Bang for the buck is amazing, installation was straightforward and Crutchfield was there if I needed them as always.

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Little amp big punch

This replaced a infinity that gave up. This little thing has some punch. Im using Kenwood for Xover. It drives my Infinity Kappas with room to spare. in my 06 Ram 2500. I have the mono version of this in my jeep as well. Great little amps and at good price.

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Sound Ordnance M75-4

Solid product

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Sound Ordnance M75-4

Pleasantly surprised at the quality of sound and the amount of power this little amp delivers.

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Sound Ordnance M75-4

Definitely a good product we buy from them again..

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Nice and compact

Great little 4 ch amp for the money! Two issues tho... mounting holes are in awkward positions, hard to access properly. And the speaker output connections are inaccessible once you've installed the amp. No way to access the speaker outputs for tuning or testing the amp.

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2007 Honda Civic

Does what I bought it to do. Pushing 4- 6" speakers and two tweeters in my Honda. Nice crisp quality audio without having to "crank it all the way up." Happy with this low -ish wattage amp.

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I have been a Rockford Fosgate all my life - this is my new favorite

All I can say is this little amp has an incredible price point and packs a PUNCH (no pun intended, Rockford Fosgate). I needed to replace my amp for my boat and this has brought out sound that I never knew existed. Super small footprint, very high quality, great performance and great sound. I was really surprised all around, as this is a great unit at a great price.

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Sound Ordnance M75-4

Great product! Works just how I needed it to.

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Sound Ordnance M75-4

The m75 Amp makes my car sound awesome!!!

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Sound Ordnance M75-4

Good power, good price, good performance.

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Way to small and cheap.

This amp cannot even power four 75watt 6 1/2" alpines I also bought here. I was told by and trusted the support person to send me the right gear. I even had a professional install it who agrees this amp is the problem.

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Sound Ordnance M75-4

After many years of trying and settling, I've moved on from this amp. There is a certain compression of dynamic range, the bass is not musical and there seem to be an uneven roll-off / filtering at higher frequencies.

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Really nice amp for not a lot of money

So far runs really well, build quality seems to be really nice. Great amp for the price.

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Sound Ordnance M75-4

im sure this is a good amp, but im going to have to return it not 2 days after I received it. I wired everything correctly double checked then triple checked and it seems channel three has died only a day after i have installed the amp. all the other channels worked. I'm sad to say that the amp I received is not a quality one.

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Good amp.

Does what it's supposed to. Mounting holes are a pain to get to because of the way they are deigned. An update there would be a plus.

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Powerful punch!

Nice compact, yet powerful design. Plenty of punch feeding 4 6"+ coax Rockford speakers. Clear signal and easy to tune. Highly recommend for any application, and great bang for buck.

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Sound Ordnance M75-4

Easy to setup/install and perfect size. Put it in my 93 K3500 and it fit in the same location as the factory amp.

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Spend a few extra dollars, buy ANY other amp.

Price is alright, but if you want something with a "familiar" set up, buy a Kenwood, Alpine, JL Audio, etc. The "engineer" that designed the speaker terminals on this unit, is not a friend to audio enthusiasts. The speaker terminals have small flat blade screws at the bottom of the terminal block. One of the amps mounting points, is abundantly in the way of accessing the last screw on the speaker terminal. Attaching speaker wires must be done with the amp raised off the mounting surface, in order to secure the wires into the terminals. It makes for a time consuming and frustrating ordeal. All other reputable amp manufacturers use a screw from top speaker terminal.. NOT Sound Ord.. Avoid the headache... buy any other brand.

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Small, but powerful.

Lots of power coming from this little thing! So far no issues. Great amp at a small price.

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Sound Ordnance M75-4

the size

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Sound Ordinance Amp a great product at a great price.

Great product for a competitive price. Of course you can never go wrong buying from these folks. They pride themselves on customer service as they should. It is second to none. Thank you again from a very satisfied customer.

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Find a better brand.

Not a good amp. Had lots of alternator whine from day one which drove me crazy. Unfortunately, not being a professional installer I figured it was something else. 2 of the 4 channels died at 4 years. Won't go with this brand again for sure.

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Sound Ordnance M75-4

I was steered into purchasing this amp and after using it for about a year,I am sorry to say this is not worth the money!!!! Too much "whizzing" noise coming from unit.Replaced w Rockford Fosgate p400x4. MUCH BETTER! Anyone interested in a slightly used piece of junk amp?

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Very loud ringing noise, unbearable.

I got this amp to power four 6.75 speakers. The good news is that it's plenty powerful. The bad news is that it makes an unbelievably high pitched ringing sound, which it then sends to the speakers. It's unbearable and I'm very unhappy with the product. I had a pro audio shop install it, so now it will cost another installation change to have a new amp put in. Additionally, the install shop threw away the box, so I don't believe I can return the item (Correct me if I'm wrong Crutchfield).

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Awsome sound

The overall performance is awesome but it's more technical when it comes to setting it up (wiring). I'm getting engine noise which I'm sure is nothing more than I need to change my ground to the amp. Find a better ground.

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Great factory amp upgrade

I just installed this amp to power 4 Polk Audio DB 652 speakers in my 2001 Mitsubishi Spyder. They were previously powered by the stock Infinity amp. What a huge difference!! Easy installation, and a significant difference in sound level and quality. If you're building a system on a budget, I highly recommend this amplifier.

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Works fine, but gets really hot

I like the small footprint of this amp, it doesn't take up much space at all. It sounds good, has plenty of power for aftermarket speakers, and Crutchfield's customer service is always on point. My issue with this amp is that it gets very hot very fast. I have been installing car audio for several years, and this amp was properly tuned using an oscilloscope. It gets very hot and the fan gets very loud. The strange part to me is that it gets extremely hot even without being used/pushed hard. Just having my stereo on, even at very low volume, will cause this unit to get extremely hot. However, even with the heating issue, I haven't had any problems since I installed it a year ago with the amp cutting out or going into protect mode, I just wonder how long it will last getting so hot so often. Some reviews mentioned that the amp doesn't allow larger enough input wires, but 12 gauge is plenty big for 75 watts, so I'm not sure why you would need larger gauge than that. In fact, for most aftermarket speakers, 16 or even 18 awg speaker wire is fine. Additionally, I personally wouldn't use this amp to power subwoofers, there are other amps in the same price range better suites for subwoofer applications.

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Perfect

Small size allowing multiple options for hiding. Plenty of power for running the door speakers in Dodge 1500 quad cab.

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Fan is loud, sounds like alternator whine

The fan that is in this amp is really loud. It is a high pitched sound similar to alternator noise only it doesn't fluctuate with the accelerator... It certainly isn't acceptable at low volumes.

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Sound Ordnance M75-4

Great little amp,makes the speakers bump! And it fits almost anywhere it is so small!

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Great amp

Paired with Alpine type R 6.2 component speakers and they are 130w rms. But at 75w per channel rms this system is perfectly too loud. Crisp clear and bumping . Awesome price as well.

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They sell used products as "outlet" products with missing parts

They sent it without the connector. It's not usable. Don't buy from the Crutchfield outlet. Wasting my time. Purchased a head unit, 4 speakers, and two amps. All pointless without that tiny piece.

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Big bang for the buck!

Works well, especially for the money!

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Mulberry

Im not sure why the yall had to put the word power input directly under the ground wire but i finally put this out of its misery.worst 4 channel amp on the planet.yall dont sell rockville but you sell this trash?i got a refurbished kicker cxa 360 that puts this thing to shame.got some of the sound ordinance 6.5's for the rear door.i dont even think they are 5's

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Good Quality

Good quality amp. I used it on my Harley Road Glide was able to fit nicely under the fairing

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Terrible whine and random shut offs

I don't know if I received a lemon or what, but this amp is horrible! I could not get this thing to stop giving alternator whine noise no matter what I tried. Multiple attempts at regrounding, rewiring the power wire, rewiring the remote turn on wire, new RCA cables but no luck. CONSTANT whine. I spoke with a Crutchfield consultant and they suggested RCA inline filters so I even bought those and it still didn't work. The whine was still always there. Then it would just shut off for no reason. It might run for 2 minutes or 30 minutes but it would eventually turn off. I've since replaced it with a Kenwood and every problem has been resolved with no additional wiring of RCA cables, ground cables or anything.

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Sound Ordnance M75-4

All good except after you mount it you can't install the speaker wires. Major malfunction in the design. Otherwise very happy..

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Noisy, terrible amp

I bought this amp at the suggestion of the Crutchfield rep. Not sure why, but he seemed to be talking me out of a slightly more expensive name brand amp in favor of this one. Well, I trusted him, and that turned out to be a mistake. This amp is terribly noisy, emitting a high pitched noise intermittently through the speakers. I knew it wasn't alternator whine. It'd do it with the key in any position and wasn't affected by revving the engine. Checked the ground. Double checked the ground. Same issue. It's a noise almost like when the ballast in a fluorescent light fixture is going bad, but louder. "EEEEEEEEEEEE" Mind numbing. On top of the whine, the amp distorts the signal so terribly that quiet, acoustic guitar intros sound as though they were recorded through a megaphone. Just terrible, terrible sound quality all around. Well, Crutchfield is always good about returns, so I put in for one. Unfortunately, my wife mistook the box for trash, and threw it in the garbage. The truck had come and gone by the time I noticed. I guess it's fitting, because that's exactly where this amp belongs - in the garbage. I ended up going with a Kenwood that cost $20 more than this one. No noise, crystal clear sound. Don't make the same mistake. Remember, buy once, cry once. Unless you're installing this in a lawn mower, go with something better.

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Sound Ordnance M75-4

The footprint of this amp is very small. It is currently installed in a 2020 F150 Crew Cab along with the Sound Ordnance M350-1 along with AudioControl's LC6i. I am currently using the 4 channel to push my factory speakers until, well, they give up. I will be replacing them soon. This is a great amp, especially for the price. It is small, plenty of power for mids and highs. I was concerned given the price point and the fact that I was not familiar with the Sound Ordnance brand name. I am not disappointed at all. This 4-channel amp, their mono amp and their 12 inch sub are fantastic in the truck.

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CEASAR CABREJA

Íam very happy with every service every one does,everything I call for help you are best god bless everyone on crutchfield and thank you crutchfield for having things I need and have many beautiful years to come god bless everyone Mary Christmas and happy new year's god bless crutchfield Thank you. Ceasar cabreja

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You Get More Than you Pay for

You've heard the term, "you get what you pay for?" With this amp, you get quite a bit more; I suppose that's the advantage of a house brand. The sound is crisp, clear, and a lot of power for the price paid. It powers four 75 watt rated speakers to distortion easily; and much louder than my ear can handle at full power :-). My opportunity for improvements are to make the speaker wiring harness easier to get on and off. Consider a snap-off, or snap-on instead of the long screws. And make the instructions larger - especially with the speaker wiring diagram. Random advice: Get goo shielded RCA cables. I had to run them twice due to engine noise being present when I turned the amp on. (My fault, not the amp's. All amplifiers have this issue).

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Sound Ordnance M75-4

Works great! really made my Polk door speakers come alive (Dakota Quad Cab). Easy to install under the drivers seat. Very happy with the purchase.

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Sound Ordnance M75-4

Hooked these up in my daughters car to the factory replaced speakers a set of 6in JBL and 6X9 JBL 3 ways. The built in high pass filter makes the high pop.

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Nice little amp

Just installed this little monster, sounds way better than my 20 year old California amp. This drives my Infinity References nicely. Only reason for 4 stars is the speaker connectors....to small.

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Sound Ordnance M75-4

vary good, professional audio.

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Sound Ordnance M75-4

Love it ! Works just like I was promised. Your people are great

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Great affordable amp

Works great and compact. Fits under the driver seat well.

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Sound Ordnance M75-4

Wow its so small and pretty i don't even want to install but sounds amazing and a cooling fan best amp i have owned.

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Sound Ordnance M75-4

So far it's a pile of junk. The fuse keeps popping no matter how I have it wired. I talked to Crutchfield and they are going to exchange it so hopefully it will be a 5 star then.

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Looks nice

Mine was not a good amp, it made this noise where after a while it got irritating. Went to my installer and was swapped out with a Kenwood, no more noise. Hopefully this can be returnable.

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sound ordinance 4 channel

excellent compact amp for the money. Choose wisely where you mount runs hot within a few minutes so make sure you have adequate airflow underneath . I love that I can add the bass back into the factory speakers that the factory radio eliminates , the factory door 6x9's really thump and put out some satisfying bass and it really made the rear doors sound like i have aftermarket upgraded speakers. You will need an Audio Control LC2 or 6 if your using a factory radio with no rca outputs, overall I recommend upgrade with this amp before you invest in upgrading your factory speakers .

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2 year review

I used this amp in 2 systems over 2 years and it has done its job. First system was in a 1996 Saab 9000, warranty sticker fell off right out of the box, powered 4 inch speakers in the front and 6x9s in the rear and it was clean, that system had a lot of engine noise coming through, probably because I routed the rca's next to the power cable. The bass boost is pretty nice. The second system was in a 2007 Chevy Monte Carlo, 6.5 infinity components in the front, 6x9 kickers in the rear. I used quality rca's and routed them away from the power cables, I have a clean power and ground with good cables and I still get engine noise, its noisy too so it has to be the from the amp. Otherwise it works great, sounds clean but you have to be careful with the bass boost knob, you can get into clipping pretty quick. Speaker terminals take 16 gauge, I do not see someone shoving 14 gauge in. It does get pretty hot but has not shut off on me. In the first build it was mounted upside down under the passenger's seat, cut the carpet away from where it was mounted, and that was in Arizona. Second system I have it mounted under the rear deck in the trunk, plenty of airflow there and it gets run hard. I believe it puts out its rated power but seems like it outputs less power after it gets warm, like 10 minutes in.

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Sound Ordnance M75-4

Very compact and easy to install. Sound is crisp. I'm far from a pro, yet managed and am very happy with my sound system. Paired with kicker speakers(6x9 & 6 1/2)

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Nice fit for Jeep Wrangler

I love this amp! Sounds great and fit right into the factory install location in my Jeep Wrangler without a problem.

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Best deal!!!

I absolutely love this product. I've been using sound ordinance amps for years and they have always outperformed and outlasted others of the same power, the price really cannot be argued. For what you get it's basically a steal. Would definitely recommend for anyone looking to get amazing sound out of their aftermarket speakers.

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Sound Ordnance M75-4

I love this amp! I had it installed under the seat to save cargo space. I have it connected to my four door speakers. Added so much depth to their output. Was just the right wattage not to much not to little ya know that goldeezy lo locks

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Sound Ordnance M75-4

I like the compact size of this amp, it compares well with sound Quality of my old A/B class amp.

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Sound Ordnance M75-4

it is a birthday gift for my Daughter. KILLS IT !!!

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Sound Ordnance M75-4

easy to conceal and packs a lot of power for a small amp perfect when you dont have alot of available space ,will easily fit in a console or glove box or under seats

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Great amp

Great clean power, very surprised for the price this amp is excellent.

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good for price...but.

nice compact amp but... pros: -compact -powerful -easy to install and use cons: -fan is really loud -requires 8 gauge wire, if you were to use a 4 to 8 gauge reducer, its gonna stick out where it is unable to mount on a flat surface. most audio installers will use 4 gauge for normal systems. -angled wire mount -mounting points. why on the inside? good price for this 4 channel, but be aware of the cons. plan accordingly before install

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Mine got really HOT

The size of it is perfect as it is compact but specs are great for it's size. It felt very sturdy out of the box, well built. However, I did not like the small input for the speaker wires and they were difficult to get to once the unit is installed. My old Boss amp is bigger but much easier to get the speaker wire inputs and to double up. The thing that really made me lower the score though is the unit got really hot in a short amount of time. I used the same speaker wire setup on the m75-4 as I did on my 13 year old Boss amp. I started with just one wire per connection the same as my Boss. The Boos amp stayed perfectly cool but not he m75-4. Maybe a I got a bad model. I doubt I wired it wrong given how straight forward it is and that I followed the manual to be sure. I returned it it very quickly as I did not want a fire hazzard.

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Good amp

Installed in my 2007 HD Electraglide and so far very pleased. Using with a Kenwood BT518 receiver and Hogtunes 356F G3 speakers in the fairing and Rockford Fosgate T152 speakers in the rear and it made a huge improvement. The Kenwood alone (50w/channel) didn't have enough volume for highway speeds and the SO amp gives it plenty with plenty to spare. Now I can hear my music nice and loud and very clear at 75mph. Also is small enough to fit on top of the receiver between the receive mounting brackets so it can be installed under the fairing.

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Sound Ordnance M75-4

This little guy packs a powerful punch. I have it powering a 10" sub and 2 6x9 and it doest its job great. My only beef is the "warranty sticker" came off during install.

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Great size

Nice compact amp

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Sound Ordnance M75-4

Small and powerful! I purchased this to power some focal isu200's in a miata. It's small enough that I was able to hide it under a sheet metal panel behind the passenger's seat. It is a strong amp. I turned the gain up maybe half way and it drives the speakers great!

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Amazing mini amp !

This amp is amazing for it's size. It has some power to it. Adjustments are very nice and functional also. One valuable bit of information everyone needs to realize is... Due to its size, cooling is very necessary as heat sinks are not as bountiful. This is addressed by having a cooling fan incorporated into the amplifier. This fan resides and pushes air through the bottom of the casing. If you flush surface mount this amp, you are eliminating the functionality of this cooling necessity. You need to raise the case up some to allow air to move in and out of the unit to cool.As mentioned, the speaker connections are odd, small and a little awkward, but still plenty functional. I still give this amp 5 stars due to its incredible power for its size !

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Sound Ordnance M75-4

Don't be surprised of the size of the amp it's small but it rocks .

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Sound Ordnance M75-4

great little amp which fit in my glove compartment

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Sound Ordnance M75-4

Easy to install due to small size. Will fit about anywhere. Cleaned up the sound in my truck.

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Sound Ordnance M75-4

Can't beat it for the price.

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Nice piece that makes the whole system work beautifully

The performance of the amp (installed for about 1 week) has been exemplary. The following equipment is installed in a single cab 85 Chevy K10. I have a Kenwood KMM-X503 head unit feeding the M75-4 amp via RCA cables from the Front Preamp outputs and the Sub Woofer Preamp outputs. Amp channels 1 and 2 are driving a pair of Focal ISS-165 Component Mids and Tweeters. Amp channels 3 and 4 are bridged to drive a Kicker RT-675 2 ohm dual voice coil sub. The Focals are in the doors and the amp and sub are behind the bench seat. Crutchfield was very helpful in making sure I had all of the components properly matched with each other and the result is the best system I have ever had. I was patient and pieced it together over time with everything being at a sale price which always helps. My only criticism of the M75-4 amp is that the output connector is a bit challenging for larger wire diameter, in particular the 12 gauge output leads to the sub. Not a big deal but a better connector would make life a bit easier. I now have more than enough volume to easily overcome windows down driving in a very loud old truck. Matching your components is key!

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Sound Ordnance M75-4

small but powerful and with clear sound

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Awesome!

Was a little sceptical before my purchase, just because it's one of the cheaper amps out there, but I'm nothing but happy with this product... Period

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Amp died in one week

I bought this amp to use on my motorbike, mounting it inside my Road Glide fairing. The amp is small and light, I installed it inside the fairing using velcro to hold it under the glovebox. The speaker screws are upside down, as others have said, and the fuse is internal. My amp blew within one week of use, taking out one of my Polk MM652 speakers. You can't open the amp to replace the fuse unless you wish to void the warranty, so I sent it back to Crutchfield under warranty (they also replaced the Polk speaker as I bought it from them as well). Crutchfield customer service was great to deal with, per usual. I wished this amp was the 'great buy' for my bike, but I cannot recommend it to others.

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