Overview: The PSB M4U 2 headphones are part of the Music for You (M4U)
series of high performance headphones. The M4U 2 has Active Noise Cancellation,
powered by two "AAA" batteries (supplied), which
eliminates external noise. The
headphones come with two 5' cables (one with an in-line remote/microphone and
one without), airline and 1/4" adapters, an extra set of earpads, and a
semi-hard zippered storage case.
Operation Modes: The M4U 2 headphones feature three modes of
operation, controlled by a 3-way switch on the right earcup: Active Noise
Cancellation (ANC), Active Mode, and Passive Mode. When ANC is activated,
external noise is picked up by the built-in microphones and canceled by
introducing an inverted (out-of-phase) signal. At the same time, the incoming
audio signal is amplified by the built-in amplifier. In Active Mode, the audio
signal is amplified, but there is no Active Noise Cancellation. In Passive Mode,
both active circuits (ANC and amplifier) are shut off, and the music is driven
by the connected device. You can listen in Passive Mode when your batteries are
Room Feel: The M4U 2 has Room Feel technology, which gives the
headphones the same true-to-nature sound as a pair of PSB's in-room
Ear Pads: The soft earpads are designed for comfort and fit. The
ergonomic ear pads are gyro-suspended and self-adjusting to give you a precise
fit. The M4U 2 comes with a spare pair of earpads.
Cables: The M4U 2 includes two 5' tangle-free cables, which can plug
into either side. Both cables have an in-line Monitor button (see Monitor
Function below). One cable is designed for use with your smartphone, and
includes an in-line remote and microphone. The remote lets you answer and hang
up your call, and play/pause, skip forward, and skip backward. The controls are
compatible with iPhone and Blackberry. The other cable has no in-line remote/mic.
A dual-input airline adapter and 1/4" stereo adapter are included.
Note: The cables must be plugged in with the straight
end in the headphones and the right-angled end in the playback device.
Monitor Function: Both included cables have an in-line
Monitor button. When pressed and held, the current audio track is attenuated by
30dB, and the surrounding sounds will be amplified through the headphones. The
Monitor Function only works when the headphones are in Active Noise Cancellation
Batteries: The M4U 2 noise-canceling headphones are powered
by two "AAA" batteries (supplied), which are inserted into the left earcup.
Battery life is approximately 55 hours on average when using Active Noise
Cancellation. You can use rechargeable batteries if desired, however, battery
life will be shorter.
- Frequency Response (+/- 1.5dB): 20-20,000 Hz
- Sensitivity (1kHz/1mW): 102dB
- Power Handling: 30mW maximum
- Impedance: 32 ohms (passive), 10k ohms (active/ANC)
- Driver Size: 40mm
- Weight: 12.8 ounces
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