Amir's review is here...
This is a review and detailed measurements of the AIYIMA A07 desktop amplifier based on TPA3255 class D amplifier chip. It was kindly purchased new by a member and drop shipped to me. The cost is US $72 on Amazon including prime shipping. And as of this shipping, it also included a 32 volt, 5...
www.audiosciencereview.com
First lets have a look at the Fosi TPA3116 ... I've probably set about 30 TPA3116 amplifiers up as "sound bar killers" for friends and clients. They're pretty good little amps. But in the typical Chinese style, you are not going to get 100w/ch out of it... in all truth you will get about 45w/ch on 4 ohms and 30w/ch on 8 ohms ... and yes, that is more than enough for most people.
The TPA3255 chip is next generation Class D from Texas Instruments, one big step improved over the 3116. Here you can reasonably expect 180w/ch on 4 ohms and 100w/ch on 8... but with far lower distortion and greatly improved linearity. So yes, it's a better chip.
The Aiyima A07, is a good amp. Don't think otherwise. But you also have to realize the limitations of the way the 3255 chip is implemented in this case. First it's in a sealed enclosure, with no ventillation so you are going to run into thermal limitations long before you reach maximum power (which requires a 48v 8 amp power supply.) The amp is supplied with a 32volt supply which is probably the best compromise between performance and longevity. On 32 volts you will get about 100w/ch on 4 ohm loads and 60w/ch on 8 ohms.
The power bricks also warrant comment. These bricks are designed for other uses and adopted by the amplifier makers as off the shelf parts. They are designed to be plugged in with no load and then have the load connected later. Turning the AC on and off with the amplifier connected will eventually kill the power supply due to the huge inrush of current with both the supply's internal filtering and the even larger filters in the amp when AC is first turned on. The answer is to plug it in and leave it powered on, all the time.
I have about a dozen in client use now and they're all happy as clams. One came back with a small problem that I was easily able to fix and my personal one had a problem with a bad IC socket under one of the op-amps which, after more than normal head scratching, is now fixed and working fine.
So... if you are looking for a really nice 60w/ch amp and you hook it up and leave the AC on continuously, using the standby switch on the amp to turn it on and off... you're in luck... this is a great choice.