PSB M4U 1 & M4U 2 Headphones

PSB M4U 1 Headphones

• Transducer: 40mm dynamic
• Operating principle: Closed
• Ear coupling: Circumaural
• Frequency response: 20 Hz–20 kHz, +/- 1 ½ dB
• LF cutoff -10 dB: 10 Hz
• LF cutoff -3 dB: 15 Hz
• Sensitivity: 102 dB at 1 kHz / 1 mW
• THD: 0.25% at 1 kHz / 1 mW
• Maximum power handling: 30 mW
• Impedance: 32 ohms
• Headband: Polycarbonate
• Driver enclosure: ABS + polycarbonate
• Ear pads, headband: Leatherette
• Travel case: EVA
• Connection: ⅛ in (3.5 mm) stereo jack (left or right)
• Cable: 59 in (1.5 m) detachable, tangle-free cable
• Overall dimensions: 7 ⅞ x 7 ⅞ x 2 ⅞ in (200 x 200 x 70 mm)
• Ear cushion outside: 2 ¾ x 3 ⅞ x ¾ in (68 x 98 x 17 mm)
• Travel case: 6 ⅜ x 8 ⅜ x 3 ½ in (160 x 210 x 86 mm)
• Weight: 12 oz (340 g)

PSB M4U 2 Headphones

• Transducer: 40mm dynamic
• Operating principle: Closed
• Ear coupling: Circumaural
• Frequency response: 20 Hz–20 kHz, +/- 1 ½ dB
• LF cutoff -10 dB: 10 Hz
• LF cutoff -3 dB: 15 Hz
• Sensitivity: 102 dB at 1 kHz / 1 mW
• THD: 0.5% ANC on, 0.25% ANC off at 1 kHz / 1 mW
• Maximum power handling: 30 mW
• Impedance: 32 ohms passive, 10 kohms active/ANC
• Headband: Polycarbonate
• Driver enclosure: ABS + polycarbonate
• Ear pads, headband: Leatherette
• Travel case: EVA
• Battery life: 55 hrs
• Connection: ⅛ in (3.5 mm) stereo jack (left or right)
• Cable: 59 in (1.5 m) detachable, tangle-free cable
• Overall dimensions: 7 ⅞ x 7 ⅞ x 2 ⅞ in (200 x 200 x 70 mm)
• Ear cushion outside: 2 ¾ x 3 ⅞ x ¾ in (68 x 98 x 17 mm)
• Travel case: 6 ⅜ x 8 ⅜ x 3 ½ in (160 x 210 x 86 mm)
• Weight without batteries: 12.8 oz (362 g)

With PSB M4U 1

• Protective travel case
• Extra ear pads 
• 2 x 59 in (1.5 m) cables: standard and mic-equipped
• 3.5–6.3mm stereo plug adapter
• Airline connection adapter
• Cleaning cloth 

With PSB M4U 2

• Protective travel case
• Extra ear pads 
• 2 x 59 in (1.5 m) cables: standard and mic-equipped
• 3.5–6.3mm stereo plug adapter
• Airline connection adapter
• Cleaning cloth 
• 2 x AAA batteries