If you've read the
Sony MDR-NC11A review, you know that the first thing I did was hook the Sennheiser PXC 250 up to my A/V receiver. Unlike the Sony, these actually sounded pretty decent! Don't expect your head to be blown off by the bass, but the sound was pretty balanced throughout the low, mid and high range. Pretty impressive really for such a small headset.
Next on the list was of course to test its noise canceling capabilities. I wasn't in an airplane of course, but I figured I should be able to test it with the noise generated by the fans of my computer. I unplugged the headphones from my receiver and switched on the noise cancellation circuitry. Sometimes you do things that make you go "oh crap". This was one such moment. At first I thought that I had somehow shorted something by switching on the headphones because I actually thought my computer had switched itself off. I then realized it was still on, but the headphones almost completely canceled out its noise! When I tried it while playing music, I noticed switching on the noise cancellation also caused the volume to increase, probably due to some amplifier being thrown into the equation.
A few days later I was able to test the Sennheiser on a bus and again it was able to cancel out the noise coming from the bus engine almost completely. Last summer I was finally able to test them on an airplane - with the same convincing results. Be aware though that noise cancellation is mainly aimed at low frequency noise like those coming from plane-, train- and automobile engines - so don't expect to be wrapped inside a quiet, soundless bubble. You can still hear people and other
nuisances noises around you. But the Sennheiser's noise canceling capabilites are really very, very good.
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