Summary: this is a great amp for the price! what i had to figure out though is 2 channel means that's how many additional speakers it will power. so it will power a sub and 2 rear speakers which is perfect since i want to keep the bass that's in my front speakers. but if you want to power all four speakers and say two subs you would defiantly need a good 4 channel amp.
Conclusion: This is an okay amp overall. The power is more than you would expect, even though it only puts out 50 watts rms my 12's were still pounding. The only bad part is that this amp gets hot fast and shuts off. I honestly wouldnt recommend this amp unless you really need something cheap.
Summary: I bought a pyramid car amp about a month ago, it has been great it came with great options like the bass boost and has worked great with my Alpine R 12" speakers. The only problem I have with the amp is that i wish there was a power button.
Summary: I have 2 RCA 6x9 with 500w max hooked up to this and it definetly works great. It sounds like one subwoofer. It could improve your system and i would suggest getting the 1600w one for a little bit more money. Just search it and its the same color and everything.