Currently auditioning an iFi Pro Ican Signature. Straight out of the box, the the iCan has miles more authority than my trusty Burson Conductor 3xp. Notes (and not just bass) have much more weight and presence. The soundstage has expanded in both width and depth. Looking forward to further improvements with break in and trying the tube modes, which I haven't yet touched. As an aside, anyone who says you only need an amp with enough power to get the Susvara "loud enough" is talking absolute bollox.