At $129 it's hard to beat the loaded features of the Aiyima T9 amp. Three digital inputs ( USB, optical and coax ) and its DAC is pretty good. It has a sub out, blue tooth, VU meter, tone controls, remote and a tube preamp stage.
There was a faint clicking noise issue with early models which has been corrected. Its price could even drop during this week's Amazon Prime day sale. I use it on my covered porch in good weather where it easily drives a pair of outdoor Axiom speakers and the sub shown in the picture.
