For what it's worth, the Audio Envy O'nestian XLR beat the AQ carbon 48 I2s connection in my system with more sonic weight and a wider out of the speakers soundstage.
DH labs versus audio quest, HDMI
Have heard audio quest has very good HDMI cable's but also DH labs has very good HDMI cable's and about half the price.
Always been suspicious that audio quest is kind of over priced and they carry too many Lines for the various cables. These guys offer nearly 30 HDMI cable's, this is crazy.
My focus is audio quality coming out of an Apple TV box along with video signal.