Crystal clear and no distortion. This is all due to the open aural design. The sound or the extra bass doesn't stay trapped inside, anything extra comes out throught the pores on the headphone, thus creating distortion free sound. But, the sound is audible to others sitting near you as if it's coming out of neighbour's window.
From wikipedia:
Open headphones, sometimes marketed as “open air” headphones, have an open grille on the back of the earcup, exposing the driver to the outside and allowing sound waves to propagate away from the ear freely. This backing type does not isolate the listener from outside sounds; in addition, sound through open headphones can be heard by others in the vicinity of the user. They usually have less distortion due to the lack of earcup resonances. Closed headphones have a sealed backing, which attenuates sound waves propagating away from the ear. As a result, listeners away from the headphones cannot hear the produced sound easily. In addition, sound from outside is attenuated by the sealed backing, providing a level of isolation to the listener. A sealed chamber is often claimed to have the negative effect of distorting sound in certain frequencies due to resonances within the earcup housing.
how good is philips shp2700
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