I'm also curious to know his setup. Long story short, I haven't been on headfi in years and I have no agenda and I can confidently say that the Galaxy Note 8 (FiiO CL06) to the FiiO Q1 mark II to the FiiO A5 to the Etymotics ER4XR made Tool's Fear Inoculum a tranced and lucid experience. The instrument separation on Miles Davis' Kind of Blue was better than I expected, having owned an e17 years ago. I've also owned ifi's micro idsd and there's a possible disadvantage in the Q1's stage parameters; and not that the Q1 and A5 pairing sounds overly congested, I could easily discern the saxophone and piano to my left from the drums behind me and the bass towards the center, etc., but I distinctively remember the micro idsd being able to provide greater dimensions or a more enveloping sound using the ER4XR's, especially with the 3d matrix. Where the Q1 is communicative, the idsd is that while also being more demonstrative but these are only my initial impressions.. I've only had the unit since last weekend and I intend to have a more thorough experience withe the Sony xb90ex on my trip to Philly next weekend.