Customer Ratings & Reviews

Excellent sound Quality

If anyone have a question of how good is MbQuart RA640.4, I can honestly say It's excellent. I had JL 300/4 original and JBL Px300.4 and all I can say is, it sound if not the same, better than the JL. It kills the JBL. I replace the JL with JBL because it died after 8 year and I could tell the the sound quality went down, then I replaced the JBL Px300.4 one week ago with Mb Quarts RA640.4 and WAW incredible sound difference, it also took away some engine noise that I was getting with the Jbl. To be totally honest WAW, WAW, WAW and it does not get hot. " I have it under my car seat pushing 4 JL C-5s and could not be happier. I don't write reviews but this was an excemption. I was researching for over a month and I could not get a stright answer, so I hope this can help someone.

A real amp

This is the best buy I've ever had from sonic I'm telling you when I have a hertz energy setup in my car and this amp isn't even turned up a quarter of the way man this amp has some serious power and sound's clean to the bone and looks so nice.

Music to my ears!

Ordered amp, and it arrived two days later, installed that evening after I removed the Alpine MRP-F300 that was running my mids and highs, dont get me wrong, the Alpine was a great amp, just not strong enough for me. Got the MB up and running and WOW is all i can say,the clarity, the subtle details in the music, the warmth, and the power, this amp is rated 80W x 4 and I'm sure it's underrated, very clean and quite, midbass,midrange and highs soar with this amp, very very happy with purchase

Not what I expected from a "SQ" amp

I had this amp installed for a couple of weeks powering two sets of MB Quart QSD213's (the last handmade in Germany components sets from MB). I expected the reference amps to be in the same class as the prior equipment before Maxxsonics bought the MB Quart name. I was not impressed. From the plastic mounts and end caps to the cover that was drilled incorrectly, this amp felt as cheap as it is made. Clean power was not an option with this amp. Crossovers were still letting the low end through even after setting it higher than I usually would on other amps. I had Sonic cross-ship me a JBL 4 channel and the sound quality is in a different league than the RA640.4. I thought maybe my components were starting to show the wear and tear of 7 years of playing, but it was just a poorly designed amp that was the issue.

info

great amp for the price. has the power to drive your speakers to loud levels with decent clarity. if you are on a budget this amp works. crossover setup doesn't work like regular crossovers so look into that to see if it will work for you

Good Deal: Loud with Good Sound Quality

I have had my RA640.4 powering a set of polk component speakers and infinity 6x9's for about a month now. All the speakers ask for about 90wrms at 2 ohms, each, and this amp does the job. In fact, it does the job better than my old infinity 4 channel amp (I think it was the 360.4) which is significantly pricier than this amp. Although I would say that this amp does not push 640 wrms, but hey, it is a little more powerful than the infinity and sounds just as good. Overall I would recommend this amp for anyone looking for a budget bang-for-your-buck amplifier.

best amp for the price

It will be hard for one to find an amp that is as powerful as this one and as cheap. The best part is you are getting a quality amp. Everyone who knows me, knows that I buy what I want. If the amp i want is very expensive, ill wait and get it when i can. i wont settle for something else. So after doing my research and being content with buying a product that is cheap (which was a first for me in car audio) i am very pleased. For the money, you aren't taking a risk.

Great amp

Have this wired to push my mids/highs. Plenty of power and looks great next to my 1000w MB amp.

Clarity, Power, Value. Concert in a Car...

Installed the MB Quart RA640.4 with 0 AWG and a 1.2F Cap and I am impressed!
I installed the amp in a '76 Ventura with 6x9" (Eclipse) in the rear deck and 6.5" (Alpine) in the kick panels.
The subtle parts of music don't get lost as the music becomes complex.
A friend asked if I had a subwoofer, because of the clarity and extension of the bass.
Thinking of buying another for my Silverado.
Great Amp for the $$$.

Great sounding amp

I'm running this amp pushing two sets of mb quarts 5 1/4 in a boat. It sounds great and gets loud, really loud

Great Amp for basic door speakers

Nothing to write home about but this amp does deliver decent RMS power to door speakers. A large upgrade over the stock amp in my 2014 Cruze. I like this brand but the design is pretty bland.

By Joshua on February 17, 2020 Verified purchase