Installed with a pioneer deh-3000ib head unit and pioneer 6x8 4-way speakers. Sounded decent and got loud (nothing mind blowing for a guy that likes his music loud though), but removed for a day to try powering my speakers with the head unit. Sq shot way up (especially at louder volume) and spl remains the same if not louder than with the amp. Surprisingly still had excellent bass response from my 6x8s even after removing the amp. All in all felt like I wasted money on a 4 channel I didn't really need. Worked, just didn't do it as cleanly as my head units amp, and was overrated for rms power.

-Shipped fast - 4days
-Arrived with everything in box, clean, undamaged.
-HI-Inputs did not work, however the RCA inputs did.
-Looks clean and sturdy.
-Was easy to hook up, and still works today (4 month daily use)
-Underpowered, no where near 50w @4ohm x4.
-Couldn't power 60w RMS - 120w MAX 4ohm speaker.
-Did however power a 25w MAX 4ohm speaker.
-Overall it's clean and looks nice but it doesn't supply what it says it supplies. More like 30watt rms x4.

i think this boy is enough for amplifying your factory speakers , i installed it with x2 pair of jbl's speakers set max wattage 380 for the 4 speakers i don't think this thing pushes 100 watt for them its not close for 20 watt per speaker , don't repeat my mistake if you have a set of high end speaker get a high end amp with them from brands like pioneer,kenwood,rockford
i forgot to mention it make annoying noise with rpm load when you accelerate you will hear more annoying noise from the speakers i think because its trying to reach its peak power .

What do you expect from an amp that costs less than 50 bucks? Don't expect much of anything, and this amp will fill the bill.

The output from this amp comes from two old-school two-channel hybrid modules that produce no more than 16WRMS per channel. That's right. Sixteen. There is no switching power supply in this amp, the output modules run on straight battery 12V, so there's no way it can produce more power than that running an old school class AB power module.

How do I know all this? Because the amp failed after 3 months of use - blown output module - and I repaired it.

I ran 2 pairs of Alpine 6.5 separates with this amp and it truly is underpowered. My Alpine head unit had much better dynamic range and more power. I opened this amp up to see ONLY 2 MOSFETS!! One on each side. I had the amp measured and it puts out 26 WATTS RMS X 4 @ 10% THD!! Not (.10) but a full (10.0) THD.