The best one in its class, just don't add the last start because the power supply, if you will power a pair of middle power speakers, then the power supply is enough, but if you want to have all the power and gain from this little amplifier, then buy a 24V and 4amps power supply, you will be surprised how the power will increase

First things first, the power supply that comes with thing is not only bad, it's actually dangerous

That was enough to convince me that the power supply should NOT be trusted

All three worked fine with the exception of one of the units which had a horrible hissing, static-y sound when the TV it was connected to was first turned on.