Sennheiser's new IE headphones aren't, I don't think, an indication of in which direction their browser loyalties lie, but instead consumer versions of the company's pro-headphone line. Dynamic transducers can supposedly cover the whole frequency range with just one unit and the cables are reinforced with Kevlar. Top of the range is the IE8, which has a low-frequency dial on each earpiece to adjust the bass response, while frequency response ranges from 10 to 20,000 Hz and passive attenuation can be up to 26 dB.
The mid-range IE7 boasts a frequency response of 10 to 19,000 Hz and attenuation up to 20 dB, while the IE6 relies on passive attenuation up to 20 dB and a slightly reduced frequency response of 10 to 18,000 Hz.
Both the IE6 & IE7 come with a carrying case, while the IE8 has a special transport case with humidity control built in. Multiple ear adapters are supplied in varying sizes.
The Sennheiser IE6 and IE7 will be available in March, with the IE8 following in April 2008.