I have a Raspberry pi 2 with a Hifiberry+ clone (I2S). It is a Hifiberry+ clone but since they use the same PCM 5122 chip, I think they are the same. I use Volumio 1.55.
My test is to rip an audio CD using iTune to Applelossless format and play the songs via the Raspberry pi + Hifiberry and compare to the same songs played using a DVD player connected to a low end DAC via an optical S/PDIF.
I found the DVD player + S/PDIF sounds much better than Volumio with Raspberry pi/Hifiberry+.
Is it expected? Are people having the same results? Anything I can do to improve Volumio + Raspberry pi + hifiberry combo?