I have a pair of Nuraphones, which have in-ear microphones for personalized frequency sensitivity calibration. They sound great with the SXFi amp, but it's quite clear that the full potential hasn't been reached yet. There's obviously no Nuraphones profile in SXFi, given that it's such a niche market. Would be great if Nura and Creative can combine their powers for spatial and frequency personalization. The best would be for Nura to get the patent for SXFi and do a firmware update for the Nuraphone.