As I listened to music, the Sennheisers and AKG earbuds sounded very good driven by the iFixCAN.
The HD 800s present a relatively difficult load of 300 ohms, but the xCAN had plenty of gain to drive them to uncomfortably loud levels, even when I played an album of very low average loudness through its single-ended output. And with all its sound enhancements disengaged, I found the iFi effectively transparent.
Most of the enhancement options provided by the xCAN proved useful in maximizing my enjoyment of music. The 3D+ setting is yet another implementation of a crossfeed circuit, which tends to bring the soundstage forward while narrowing it.
iFi Audio’s xCAN is a great product for those looking to improve their smartphone listening experience. Without its enhancements engaged, its sound was thoroughly transparent, providing enough gain for most any pair of headphones without any colorations or ill effects.
More than that, it’s the feature set that matters. XBass II sound enhancement couldn’t be easier to use, and provided serious improvement in sound quality through two clever options: Bass and Presence. And iFi’s 3D+ crossfeed circuit is available for those who enjoy this sort of effect, or find long-term headphone listening fatiguing.