Ultimate Ears Triple Fi 10

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.