2-CH Hi-Fi Stereo Amplifier for Car/Motorcycle with USB Port

Pros: Definately not Hi-Fi by audiophile standards, but for the price, the quality is quite acceptable. It needs a good clean power source to produce good sound though, a 12v Auto battery is a good test.
Bass and trebble boosts worked well with little distortion.
Will power 4 3-4ohm car speakers sufficiently if properly cooled. (see cons)

Cons: heatsinking on the unit is not sufficient for maximum volume listening, on my car battery, especially when powering all 4 speakers. Unit will get hot and start to distort. I got around this by attaching an old cpu heatsink to the underside of it and blow a fan on it during testing, and the distorting at high volumes stopped. I'll modify something more permanent When I install it.
Audio quality on this still has a kinda cheapness sound to it compared to higher end audiophile grade equipment, I'm guessing some of that could be attributed to cheap non-audio grade components (resistors, capacitors, etc) used. but sound quality is about the level you would expect from a consumer grade car audio deck's Pre-Amp, but not quite as much raw power.
Power is good enough to power a portable device on near maximum volume quite loudly, but if your feeding it an unamped signal (such as through a line out) it will not be enough for people that like to blast their music. You'll get comfortable listening volume with windows up, but that's about it.

Other: Descent Sound quality, for the price its worth it, If even as just a backup. If your the type that is quite content with the sound of your Ipod with your $30 headphones, this may be usefull to you, but if your an Audiophile that likes nothing but the best and most accurate, this will do you more good in your trash can.
There are T-amp solutions out there, mainly using the TA-2020 and TA-2030 chips that will produce better more audiophile like sound than this for the 30-50$ range, if you'd rather spend a little more to get better quality, but usually lack the nice package with control nobs that this has. "41hz" comes to mind when it comes to DIY projects using these chips. Would be nice to see some of these kits show up here.

Pros: It is cheap and powerfull enough to drive 2 speakers. It also has an USB port to charge any device, from a mobile phone to a mp3 player.
It also has RCA and 3.5mm jack inputs.

Cons: It is pink. Black or white, or blue would have been better. Anything but pink.
The volume knob has some leds around it which stay flashing anytime it is on. Some people might not like it as it does not look serious.

Other: A nice and cheap, and surprisingly loud amplifier.

Pros: -Low power consuption -12v Power supply (very common) -IN signal (high sensitive ) -OUT signal ( high power considering heat sink size and power consuption ) -Output resistence range is very aplicable when we use diferent tipes of speakers. -Bass and Treble Control very Accurate -Very Cheap

Cons: Just one point, internal led siwtches the color every 1 sec., at first look is not good looking for a device that normaly comes with strong color as pink and blue.

Other: For this price is very good device to achieve, depending of appliance is possible to use in professional sound as pre-amp something like that.

Pros: A very good amplifier. I test it with an AC/DC power suply of 12V - 3A from a HDD external, 2 speakers Aiwa 30W-6 Ohms and a mp3 connected with a 3,5mm jack M-M. Music in test: Electronic music and Heavy music. With the Amp at maximum volumen and the mp3 at 3/4 of maximum volumen it works perfect, without distorsion. ONLY HAVE DISTORSION IN ONE CASE (SEE CONS)

Cons: When you connect the mp3 (or another thing) in USB port to charge it, the sound have distorsion. It can hear when change song. The volumen of the distorsion is proportionally at the volumen of the Amp.

Other: Best Quality/Price. Good buy.

Pros: Cheap product, does what it say it does. Connect to 12V, speakers and to any sound input and it will work perfect.
Build quality looks ok.

Cons: Sound quality is bad. I did not expect more in this price - but it is important to know before buying it. Also it is 10W device - which is very low.

Other: If you need to amplify sound, and you do not care much about quality - this product is for you. Do not expect more then a very basic amplifier.

Pros: Very low price. Ability to adjust bass and treble. Pleasant appearance. Very easy to use. uses 12v Sound is loud and good at adjusting net! High power output for its size and price! Works well with auto acoustics

Cons: Well, conveniently located USB charging. For me the cons of it do not!

Other: For their excellent prices amp cons as there are none. I recommend to buy

Pros: It is cheap and powerfull enough to drive 2 speakers. It also has an USB port to charge any device, from a mobile phone to a mp3 player. It also has RCA and 3.5mm jack inputs. It reaches a very high volume

Cons: The Led Light that is continuing changing colour is a bit anoying, But you can block it with anything. La luz que cambia de coor puede llear a ser un poco molesta

Other: A nice and cheap, and surprisingly loud amplifier.One of the best items i have bought LO RECOMIENDO!!!

Pros: If you need to drive some speakers and don't want to spend a lot of money, this amp will do wonders. Try to find something like this for less than a hundred dollars. It doesn't sound quite as nice as a more expensive amp will, and is only two channels, but for speakers in your garage, kitchen, or bedroom, this works great.

Cons: The flashing light is annoying if you're using it in a dark room. If it bugs you too much, open the case and just bend the LED around backwards.

Other: 100 watts will drive most speakers pretty well.

Pros: This is an excellent amplifier. It is most likely a class D amp with excellent specs. It requires a good stiff power supply as does any amp for best results. Of course the quality of the speakers plays a big part too. I am running it from a 12 volt battery supply that can supply 250 amps at 12 volts so there is no chance of sag. The speakers I use are decent 3-way Hi Fi speakers with 10" woofer and proper crossovers for the midrange and tweeter. The output is at least 10 watts per channel and it has good clean anti-clipping circuitry. This amp produces excellent bass and highs with no audible distortion. I have very good ears too and used to work repairing audio systems many years ago. For only $14 US it is a bargain. I do hope DX gets more in because I want another one or two.

Cons: The pot for the volume is cheap and makes noise when adjusted. That doesn't matter to me since I don't use it to adjust volume. The "cute" light on the volume pot is unnecessary but not very annoying.

Other: Very good value for the low price.