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"Frequency Response : 4 - 100,000 Hz"
OK now this is just getting absurd. To "hear" 4hz (would be more just feeling something) you need a lot of power, granted handling 2watts is pretty impressive. And 100KHz? Even self-proclaimed 'golden ear' audiophiles could MAYBE hear 25KHz or 30KHz (most people can only hear up to around 18KHz and that goes down with age) but 100KHz?!
...OK glad to get that out of my system. They do look nice though.
Its just 'spec' things lol. Of course we cant easily listen above 18khz - 20khz, but perhaps testing equipment can. They are putting that to show off their 'skills'.
Whenever I see unqualified frequency response, I instantly discredit any other stated ratings. 4Hz? At what, -100dB? Why not list it as at 2Hz ( implied to be at -160dB)? Hell, how about DC (-infinity dB)?
High end FR doesn't bother me so much as long as it's an honest rating. It's almost never a bad thing to have headroom even if you can't hear the tones.
Here are some actual measurements for these cans: http://www.innerfidelity.com/images/SonyMDRZ7.pdf [thanks, Tyll]