Sennheiser IE 100 Pro vs LETSHUOER S12 Planar IEM

The LETSHUOER S12 is the stronger pick for most listeners: its 14.8mm planar driver gives more detail, faster transients and deeper bass reach than the IE 100 Pro's single 10mm dynamic driver, and owners rate it far higher. The Sennheiser is the safer choice for stage and studio work, where its light shells, secure over-ear fit and easy 3.5mm wired hookup matter more than resolution. Build quality favors the S12's CNC-milled metal chassis and 2-pin cable system; the IE 100 Pro is plastic and lighter, and its Bluetooth is only an optional add-on.

• Choose the Sennheiser IE 100 Pro if you need a light, low-impedance in-ear for live monitoring or tracking, want a cable that detaches for easy replacement, and prefer a relaxed, non-fatiguing sound.
• Choose the LETSHUOER S12 if you want maximum detail and bass punch for music listening, a metal shell and a quality 2-pin cable with a balanced option, and you don't mind a brighter, more revealing tuning.