Sennheiser MM 450
Sennheiser MM 450 closed-back supra-aural headphones, with Bluetooth connection and NoiseGuard 2.0 active noise cancellation, designed for portable use with a smartphone or computer.
Description
The Sennheiser MM 450 is a closed-back, supra-aural headphone designed for wireless listening via Bluetooth. It connects to any device fitted with a Bluetooth transmitter: computer, phone or portable player, with compatibility particularly highlighted for Apple devices such as the iPhone, iPad and iPod touch.
Its main feature is the integration of an active noise cancellation system, named NoiseGuard 2.0, which reduces ambient noise during listening. The navigation controls, along with the switches dedicated to this noise cancellation system, are placed directly on the sides of the earcups, allowing quick access without having to reach for a separate control unit.
The headphones also feature a boom microphone on one of the earcups, allowing phone calls to be taken without removing the headphones. This microphone placement, away from the mouth, does not prevent voice pickup quality recognised as excellent for this type of design.
In terms of power, the MM 450 charges via a mains adaptor or a USB cable, making everyday use easier by making it compatible with the charging solutions already used for other portable devices.
These headphones are aimed at users looking for a wireless listening solution for daily mobile use, particularly when travelling, on public transport or in the office, where active noise cancellation provides listening comfort against surrounding noise. Their extensive compatibility with smartphones and portable players makes them a suitable companion for combined use with a mobile phone, for both music listening and calls.
Technical specifications
| Type | dynamic, closed-back |
| Configuration | supra-aural |
| Nominal impedance | 590/100 Ω (active/passive) |
| Total harmonic distortion | < 0.1% (1 kHz) |
| Connectivity | 3.5 mm stereo jack |
What to check before buying used
The earpads and headband, in faux leather, tend to stiffen or crack with age and are worth inspecting before purchase. The internal battery charge should be tested during actual listening, as reduced battery life or failure to charge are the most common signs of wear on this model. It is also worth checking that the side switches dedicated to NoiseGuard work correctly, along with the reliability of the Bluetooth pairing and the boom microphone.
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