Sennheiser ( has launched enhanced versions of its MM 400-X, MM 450-X, MM 500-X and MM 550-X TRAVEL Series headsets. The new models are now compatible with the apt-X codec, which the company says provides enhanced fidelity and clarity whether users are listening to music or making calls.
The apt-X codec is designed to offer audiophile travelers an enhanced Bluetooth listening experience through the use of proprietary audio codec compression algorithms. Just like the earlier MM models, the new Sennheiser apt-X compatible headsets are compatible with any Bluetooth-enabled device that supports A2DP and HFP/HSP profiles including computers, smartphones and tablets.

Consumers using computers without apt-X can still benefit from Sennheiser’s use of high-quality Bluetooth chipsets by pairing any of the new TRAVEL Series headsets with the new Sennheiser BTD 500 USB dongle to add Apt-X transmission to their computer-based music system, according to Eric Palonen, senior product specialist, consumer electronics, Sennheiser USA.

These headsets features Sennheiser’s NoiseGard 2.0 active noise cancellation technology and TalkThrough technology enabling travelers to communicate with people nearby without removing the headset. Additionally, the MM 550-X utilizes SRS Labs’ SRS WOW HD technology. The MM 400-X, MM 450-X, MM 500-X and MM 550-X are available now at the street prices of US$269.95, $449.95, $329.95 and $499.95 respectively.