Stetsom IR 400.4 2 Ohms Compact Digital 4 Channels Amplifier, Iron LINE, 400 Watts RMS 400x4, 2Ω Stable, Multichannel Digital Car Audio Amp TS, Full-Range Sound Quality, Crossover

Sound quiality is awesome! It;s so small that you can hide it anywhere. Looks strongly built. Easy to install.

This amp is awesome for powering my high pass speakers. Just enough power to sound better than simply running components from my head unit. If you have experience in installation of car audio, this amp will be a breeze. My only complaint is that the terminals for power and ground are directly beside one another(unlike most amps, In which, the remote is usually in the center) This being said, I could see how easily one could fry this amp if they aren’t careful. This is a company from Brazil, but they do have a hq in Florida for tech support in the states. Great amp for about half the cost of most brands. I will post updates on how it performs over time. Great job Stemsom!!!!One month later and I figured out how to make this little guy go hard! These Brazilian amplifiers love the voltage from the rca cables to be on the higher side for voltage, so I put my signal through a clarion equalizer first to juice up the voltage, and let me tell you! Louder and richer than before. I don’t care if this amp fries, I have already got my money worth!

Ecxelente calidad

Muy potente de verdad no esperaba tanto de este producto

I purchased this unit for front and rear speakers. They are four and a half inch coaxial in front, and 6 1/2-in coaxial in the rear. There is a significant volume increase, but more importantly, it has made the speakers come alive. It is more than I would have expected. My only concern is that I noticed that I start to get Distortion that is not related to the driver break up, but more so the amplifier. My take on this is that if you want to drive your gear to excessive levels, you may want to get a larger 4 channel amplifier. Let me know that this is at 75% and higher on the volume slider (very loud). Other than that instance, this is a great little unit.

After 1 yr in the frunk of my can am spyder i will say best audio mod on my trike. So small that doesnt take the limited precious space of the frunk.

Nice and loud, but had lots of motor noise

If you're an audiophile and quality sound is a must, after installing anything aftermarket ensure you thoroughly go through all your settings through your deck, amplifiers and e.q.; I had a very tinny and almost hall sound coming through initially after install, had to adjust gain down (10%), and adjusted bandwidth & center channel midrange (for each bass, mid and treble frequency) which does take time. Ensure you go through all your genres that have major difference in sound production, playing classical to ensure you hear each instrument, then songs with heavy bass and so on. I like certain tracks for testing, Simply Red's "Jericho" is a great example but there are tons of tracks that are suitable. If you take the time, you'll enjoy your ride anywhere you go. If you just want to hear bass a few blocks away, you shouldn't have ears.Having said all that, the sound QUALITY is crap. Not 1 review on here talking about sound quality. Just a bunch of kids that are happy to get loud, distorted music. Amp runs extremely hot even at low volumes and I'm now (after 2 weeks) getting a loud popping noise randomly. Tinny sound, hall echo, basically everything you don't want in an amp. Swapping out for another just to give Stetsom a chance but this is 2/2 for #1 the first bass amp (fans kick on and off very quickly on first bass amp, it died) and now #2 this p.o.s.I'm positive I'll be getting an Alpine amplifier to match the quality I already have going in the truck. PROFESSIONALLY installed system; 4ohm front & rear high fidelity speakers (all 3-way), 15" Skar VFX in a sealed box mounted in a blow-though. Big 3, all running double 00, 350A alternator (low rpm) with battery bank set up. 150A and 30A breakers. The list goes on.Brazilian just doesn't cut it for real audiophiles, maybe for bass & loud distortion. Disappointed.Update:2nd amp is identical to the first, of course. I was hoping to have received a lemon the first go-around. You don't need to spend 3k like on my home receiver but remember, you get what you pay for most of the time. Thanks for reading.