The TPA3116 amplifiers are attracting quite a following, as this thread audiokarma.org/forums/showth … ht=tpa3116 will evidence.
There are a number of boards to choose from, of which I have chosen two, and put them together quite successfully. I am currently using passive preamplifiers, but I have just ordered the parts necessary to build a jfet preamplifier - why? Because I want to see if I can do it, I suppose. I guess an opamp preamplifier will follow for the other TPA3116 board.
I am running one with a Geekroo Picobber DAC on a Raspberry Pi B, and another with a B+, and Behringer UCA202 USB DAC, while I decide which I2S DAC to purchase.
The projects are fun, and the sound is rewarding, and not expensive either. I now just need to look for some nice sensitive vintage speakers to complete (at least one of) the projects.