This Quad-Driver, True Three-Way Earphone. step up your game up… Westone Series, the quad-driver Westone 4 earphone will take your listening experience to an entirely different level. Four balanced armature drivers and a three-way crossover network deliver breathtaking clarity and realism. Westone’s True-Fit technology provides superior ergonomics and comfort. More info after the jump…

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Westone 4 Specifications
Sensitivity: 118 dB SPL/mW
Frequency response: 10 Hz -18 kHz
Impedance: 31 ohms
Driver: Four balanced armature drivers with a passive three-way crossover
Features: Premium comfort tips, Travel Case Cleaning Tool, one-year parts and labor warranty on internal components, 25 dB average acoustic separation, user manual