This 4 channel MB QUART 4200 amplifier is a great amplifier indeed. This amplifier is one of the best amplifiers I have yet come to purchase. My first amplifier was an Alpine, they are pretty good, but the MB QUART is even better. This MB QUART 4200 series amp is pushing my 6 1/2" Polk DB Component system, along with two 5 3/4" Polk DB speakers in the reaer doors. The amplifier is so powerful that I couldn't even turn the gain half way up, this amp is a good amp for the price. I want to get a MB QUART 2400 series amp just to have it in case I want a pair of subwoofers in the back. For the price I prefer you to even load up to on this.

I gave this a 4 just because I've never really had anything else to compare to. This amp is powering my polk db 6500 series components up front and one 12" polk db 124 sub in the back(bridged). I always wanted a sytem with overall balance in the lows and highs and this amp does that. I am listening to metal in a whole new way, so much clarity and the right amount bass to blend with it. I also tested it out with some rap/hip hop, it also gets the job done. Hell of an amp for the price.

Ive been into car audio for almost 20 years now and have used my fair share of low to high end gear. Out of all the amps Ive used I have always favored my out dated 15 year old A/D/S PQ series. I've tried everything from the newer A/D/S to Xtant with no luck. The sound quality just wasnt the same. Then I saw the MB Quart RAA4200 on clearance and thought what the heck for the price and told my wife I wanted it as an early fathers day gift!

My first impression when I took it out of the box was man this amp is big! Not to mention fairly heavy. But the build and quality of this gem does shine.

Installation was a breeze with its quick disconnect type connections. Tuning it is even easier since all of the controls are right on top.

Sound quality is excellent! I could hardly believe my ears. This is probably one of the cleanest amps Ive ever heard. I listen to variety of music everything from Jazz, alternative, Hip Hop and a little classical. So I loaded up my 6 disc changer with a variety and listened to about 30 seconds of each song from each CD and this amp was very impressive!

My system consist of A/D/S components, plates and Single 12 inch sub. So Im not really into heavy bass just balanced sound quality. But what this amp did for my 12" sub was pretty incredible.

So overall I rate it a 4 only because its a little to big for my liking. But as far as sound quality this amp is a 5. Ill probably purchase the MB Quart 2 channel or Mono amp to match this so I can take my 12 off of it and dedicate it as a "Highs" amp only. But you could just bridge this into 2 channels to run a couple subs with no disappointments but that would be a waste!