The Westone W60 features a full-range, six balanced-armature driver with 117 dB SPL @ 1mW sensitivity, 10Hz – 20kHz frequency response, and an impedance of 25 ohms @ 1kHz, 25dB Passive Noise Attenuation
The Westone B50 features a full-range, five balanced-armature driver with 118 dB SPL @ 1mW sensitivity, 10Hz – 20kHz frequency response, and an impedance of 35 ohms @ 1kHz, 25dB passive noise attenuation
The Westone B30 features a full-range, three balanced-armature driver with 117 dB SPL @ 1mW sensitivity, 15Hz – 18kHz frequency response, and an impedance of 110 ohms @ 1kHz, 25dB passive noise attenuation
The Westone W10 features a full-range, single balanced-armature driver with 122 dB SPL @ 1mW sensitivity, 20Hz – 16kHz frequency response, and an impedance of 19 ohms @ 1kHz, 25dB Passive Noise Attenuation
The Westone W20 features a full-range, dual balanced-armature driver with 117 dB SPL @ 1mW sensitivity, 20Hz – 18kHz frequency response, and an impedance of 33 ohms @ 1kHz, 25dB Passive Noise Attenuation
The Westone W40 features a full-range, four balanced-armature driver with 118 dB SPL @ 1mW sensitivity, 10Hz – 18kHz frequency response, and an impedance of 31 ohms @ 1kHz, 25dB Passive Noise Attenuation