I'm LOVING the SXFI Amp with my Massdrop FOCAL Elex (using Creative's SXFI AUDIO-TECHNICA AD700 audio profile), FOSTEX TR-X00 Purplehearts & E-MU Ebony (both headsets using the E-MU Teak audio profile), SENNHEISER HD 6XX (650 audio profile), AKG K7XX (K701 profile), HIFIMAN HE-4XX (HE-400S profile) & MONOPRICE Monolith M1060C Planar Magnetics (AUDIO-TECHNICA AD700 profile), BEYERDYNAMIC DT 770 Pro (oddly, the AUDIO-TECHNICA AD700 profile...