QS400.4 2 Ohm Mini Compact 4 Channel Car Audio Amplifier 4 x 100 Watts RMS at 2 Ohm - 400 Watt Amp Stereo 12 Volts Amp Class D Full Range Bridgeable

Small and easy to mount. Sounds good for my jeep.

Very small, performance is very nice, and good power!

Very impressive sound out of such a small package. About the size of my palm. Watts will very dependent on your setup and speaker ohm rating. If you have never delt with Brazilian amps? Setup is a bit different having 6 ports for 4 channels. Do a little research on YouTube. They might not have this brand specifically, but search Brazilian 4 channel for tutorials.

Very small amp works well

Engaña por su tamaño es muy pequeña pero con un poder que impresiona la recomiendo para mi todos los productos de PRV son los mejores en car audio llevo mas de 4 años usando la marca y es lo mejor que eh puesto de car audio

Resultó ser bueno ps trabaja bien con mis 6 bocinas y dos Twitter tiene buen volumen y por el precio parece que esta bien

I purchase this item twice and both of the amps stopped working shortly after installation. Contact the manufacturer and they tried to help me trouble shoot the amplifier but nothing worked. The manufacturer told me to return it because it was defective.

When I first received the amp I was a little skeptical because of the size and my experience with cheaper amps in the past. Not only did the little amp meet my expectations it blew them out of the water. I added this amp on top of my budget sound system in my 08 VW. For the money and the size this amp is worth every penny.

Sound quality is OK. For its size and price it's pretty good.

It seems to be good build quality and it has a year warranty but when I hooked my unit up I could not get any sound. I contacted tech support and they verified that my install was correct and got me to contact their warranty department. Waiting to see if they are going to send me a new unit or if I will have to return mine to be fixed. Update: they wanted me to send in my amp for repair which I ended up having to pay the $30 shipping fee for. Now my unit is in the USA and they informed me that they do not ship to Canada. They sent it to one of their distributors to ship to me and that was 4 months ago and I still have not received my amp back. I am $70 plus $30 for shipping into an amp that showed up defective and now I don’t even have it as a paper weight.

I cannot get more than 60-75% its rated power cleanly and it's very sensitive to static/background noise past 1/3 gain. The RCA max level input is very low and anything over 1.75V will make it clip as soon a you turn ON the gain dial. Before testing I contacted PRV to know the max RCA input voltage since it wasnt mentioned, only the minimum 200mv, and they answered saying they did not know this specification about their product. I made it work with being able to adjust gain at reasonable dial sensitivity with a signal maxed at ~1V out my LOC. The highpass filter is fine to cut some bass but the lowpass bass boost is awful and clip the output hard even at low volume. I found while testing that to run it bridged you need both channels RCA connected, it wasnt mentioned in the manual. I do not recommend this amplifier, it's the cheapest one and there's a reason... Please note that all my test were conducted at 14.0V with an oscilloscope and clean signal input at 40hz and 1Khz.

Was extremely hard to balance and very harsh, Would stick with AB class as it’s softer and cleaner sounding