I connected this amp, never imagined the power and the sound quality you don't even need to adjust amp level too high. I recommend this product you would not regret it having one.

very sturdy amp it is very solid!! heavy and it is HUGE , hasnt got hot on me just warm but very nice

theres nothing special about this amplifier except that its very strong. it is very large for the wattage.

I have been running this amp for a good wile now and it has proven to be up to any task i ask of it, driving 2 ohms or 4 x 4 nothing stops this amp and it does it with style and awesome audio too, power is right on par with my meters right to the end of its range heat was their but cool down was fast, well done MB Quart!!!

I love this amp, the quality of the sound is great, it actually produces the power it claims, and doesn't run hot, I'd recommend it to anyone, pushes my crescendo pwxs excellently.
Only con is the amps size, it easily dwarfs my aq 2200

I have this amp powering my two 15 in subs and this amp is way under rated it actually puts out 850w RMS I tested this with a digital multi meter and test tones to prove it. I have had this amp for about 2 months and have not had a single problem with it and its extremely clear at every frequency.

Installed now for a few days and its really surprised me, very loud.

I bought this amp to use for a new set of components I purchased at the same time a few months back and it is pretty rad. This amp is easy to use, had a very sleek and nice design, and is in unbeatable for the price. It pushes what it says and is very efficient. I use it to push a set of Rockford T2 components and some pioneers (temporary) and it does amazing. It has popped a couple tweeters sadly but at least I know it's powerful. Overall I would recommend this to anyone on a budget and looking for some power. I will most likely purchase another for my new rebuild.

This 4 channel amp give off mad!!! Power, Its the best voice amp i ever had, its Kinda Big, but its well worth it in the end. Does not get hot, it fact i wonder if it ever will because i play it so hard.
Get this amp you wont be disappointed.

Mb quarts onyx 4.125 amp is so amazing! Im running 6 rockford 6 1/2s and 10 tweets on this amp and it handles them like nothing! The amp gets warm but never hot! It even comes with a cleaning cloth to wipe it down! If ur looking for a 4 channel amp thats gonna be a goood buy and perform awsome buy this one I promise you wont regret it!

If you are looking for an amp thats cheap (price), puts out alot of power and sounds good this is the amp for you! I am using this amp to power 4 sets of Image Dynamics components and it does it with ease and sounds amazing! I would recommend this amp to anyone looking for a 4 channel.

The characteristics of this amplifier would be natural mids and highs, smooth midbass, and a seamless blend from the sub to the mids and highs. I am currently using this amp as a 3 channel set up with Hertz High Energy 3 ways in the front and bridged RF P3 10" at 4ohm. I have not heard such great fidelity and clarity from even some high end amplifers. I have had Stegs, JL, Alpine and many more brands of amps and this amplifier by far reproduces the most accurate sound I have heard. I am at awe how low the price is for this amp. I guess the only downsize is the size of the amp. As along as you have the space to mount the amp and let it breathe, you will not be disappointed. Audiophile sound indeed! Thanks Sonic. I'm considering buying a second one. It's that good!

I ordered this amp after purchasing the ONX4.80 hoping that this amp would be like 2 old school phoenix Gold M-100s strapped together and it is just that! I got it running my whole system right now 125x2 to my highs and 500x1 to 4-12" in a wall in my 95 Geo Metro. I have 13 trophies for SPL comps guys, so I know amps and have used many different brands and i will say I can't wait to buy a couple of ONX1500.1 for my vehicles. The ONX 4.60 is the same size as the ONX1000.1 and the ONX4.80 is the same size as the ONX1500.1 for those who like to match things up. This amp is VERY powerful and is definately more than enough for the average listener...as a matter of fact if you are an average listener then this amp is not for you. Go with a smaller amp. This amp is for someone who is very serious about their cars system. I am going to be using this amp for highs and midbass once I buy the ONX1500.1 or a pair of ONX1000.1s. I still can't believe that this amp is only $179! Where were you back in the mid 90's? BTW, I used to own 4 Phoenix Gold M-100's 3 M-50's and an M-25. I also used to own a whole slew of Memphis amps any where from 50x2, 75x4,150x2, 1000D etc. These MB Quart amps fall right in line with the power and sound quality of those amps. You won't be disappointed.

I have always considered the old school US amps to be uncomparable in sound. I was wrong the new manufacturing of today's technology far out weighs the past. The amp does the job extremely well, Doesn't get hot and the dynamic headroom is as good or undetectable against my a/d/s of the past that I paid 10 times more than this. Time to upgrade everything. This amp is worth every dollar.

How in the world is this a 165 bucks?!?! I have owned a LOT of amps, and this one is hands down the best bang for your buck I have ever seen. Clean, Loud, and Purdy! Its a big amp so be prepared, but it has an awesome glossy black finish and plenty of controls. I have it pushing a pair of Polk MM6501s and this thing pushes them perfectly. Subs are in the mail, but I can only imagine that this thing will just pound.

I almost missed this amp when searching for a new one and I am so glad that I found it. There is nothing even remotely close in price that is even almost close in specs.

Definitely would buy again.

The other reviews are correct. This amp is awesome and powerful and a steal for the price. I also owned the DSC4125 and I didn't notice as big of a difference as they are but it is a extremely powerful amp.

running 4 JBL P963 6x9's at 2 ohms and it does not break a sweat

The ONX series essentially replaces the DSC amps and let me tell you although this amp is bigger, it sounds cleaner, less distortion, and more powerful than the DSC. Although the DSC put out a TON of power, this amp puts out even more, cleaner power. I am very impressed by this amp and would recommend it to anyone especially at the prices I've seen them at sometimes. Amp is large, but that's a manageable trade off when considering the amount of power and good clean output you get from this amp.

I replaced the DSC4125 I has from MB Quart with this ONX4.125 in my buddies car. The ONX is even better than the DSC4125. It's got more detail, more power, and overall better fit and finish. The sound drastically changed and has opened up the front stage dramatically. It also is pushing the subs even better than the DSC4125 did. Overall I rate this amp a 10/10 for price/performance and overall value.