Foreword: No need for much introductions but I'll do it anyway. One of the multi-BA revolutionaries when it released in 2006, the TF10's reputation stemmed from its going price of $99 during numerous Black Friday sales and have been a staple "reshell model" for many IEM enthusiasts throughout the decade. Frequency Response Warm, downward sloping response. There is a little bit of higher treble shimmer (around 10-11k) but has a dulled midtreble response. Soft notes, not particularly sharp around the edges but does make for a non-fatiguing experience. The technical ability does show its age. Impulse A little bit of linger going on but relatively free of any massive rubberbanding. Nothing really exceptional but also nothing to fault. CSD Nothing wrong on CSD. Stable decay. THD Those BA drivers really showing off their third-order distortion on paper. Subjectively speaking, the pervasive warmth does help to mask any plasticky timbre commonly associated with BAs. Impedance Reactivity Expect treble to be killed with increasing output impedance. With the TF10 being already pretty warm, near-zero Zout sources are highly recommended. Additional notes Horrendous fit but you probably already know that. Timbre and tonality still holds up pretty well, even if transients are little smeared and blurred at times. DO NOT USE FOAM ON THESE. Turns them into a muddy mess.