This is a handsome set whose colors harmonize well with a player like the iPod - white and a very attractive light gray. The K27i also has a clever folding system so that it takes up limited space. It comes with a carry bag, making it a highly portable model. It's a classic set for its category, but with larger-than-average earpieces. It's a closed-style earphone, which is not all that common. Due to this operating principle, it provides a certain level of sound isolation, but largely in the upper part of the spectrum; so don't expect it to greatly reduce the noise of trains, subways, or airliners. Its cable includes a small sliding potentiometer for volume adjustment, which is convenient if you like to keep your player stowed out of sight. The K27i showed very wide response, but with a bass level that was significantly higher than the rest of the spectrum. Also, the bass response extended well down without attenuation.
Very broad response, both in the bass and in the treble, but with a clearly predominant lower end.
The efficiency of this model is very high, meaning that it can deliver high sound levels from a small player - sometimes with a little distortion, however. You can't expect miracles from that kind of combination.
Efficiency: approximately 110 dB/V