Sennheiser MM 400
Sennheiser MM 400 Bluetooth stereo headphones, closed-back supra-aural design, originally designed for use with iPhone.
Description
The Sennheiser MM 400 is a closed-back, supra-aural headphone fitted with Bluetooth connectivity for wireless listening. It was originally designed for use with iPhone, with a view to mobile stereo listening.
The closed-back supra-aural design means the earpads rest on the ear without fully enclosing it, whilst partially isolating outside noise thanks to the closed construction of the headphones. Bluetooth connectivity removes the need for an audio cable and allows use with compatible wireless devices.
These headphones are aimed at those seeking a lightweight, wireless mobile listening solution for everyday use with a smartphone or any other Bluetooth-compatible device.
Technical specifications
| Type | Closed-back supra-aural headphones |
| Nominal impedance | 590/100 Ω active/passive |
| Sensitivity | 107 dB SPL at 1 kHz and 1 Volt |
| Total harmonic distortion | < 0.1% at 1 kHz |
| Connectivity | 3.5 mm stereo jack |
| Length | 1.4 m (audio cable) |
What to check before buying used
When buying a used Bluetooth headphone such as the MM 400, it is worth checking the condition of the internal battery, a wear item specific to wireless headphones that determines actual battery life. The supra-aural earpads also deserve particular attention, as their foam can compress or crack over time. Finally, it is useful to test proper Bluetooth pairing and connection stability before extended use.
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