New! PX 210 BT with apt-X®
“No matter whether they are “paired” with a mobile phone or an MP3 player, the PX 210 BT guarantees perfect sound when you’re on the move. The PX 210 BT headphones have been specially designed for enjoying music from portable players, and their powerful neodymium magnets provide a detailed, lifelike sound image and a frequency response of 15 to 22,000 Hertz. The new apt-X audio codec ensures that audio data are transmitted with outstanding audio quality.”
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New! PXC 310 BT with apt-X® and NoiseGard™ active noise cancellation
“Newcomers to the Sennheiser product range in August 2009 are the PXC 310 BT and PXC 310 travel headphones. No matter which model one chooses their proven Sennheiser acoustics and patented NoiseGard™ 2.0 technology offer optimum sound quality even in noisy surroundings. As a further feature, the PXC 310 BT for the first time combines all the advantages of travel headphones with the Bluetooth apt-X audio codec.”
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THE SUNDAY TIMES, Sunday, October 25 – on page 20 of the InGear supplement, by Alex Pell…
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Which attributes of headphone design have an objective affect on the performance perceived by the listener? One of the most important aspects is “frequency response”: the range of frequencies over which the headphones can effectively reproduce sound energy. 
