Could you please tell me the frequency response of the 'E1' in ear phones?
The frequency response of the any earphone is dependent on the individual's ear canal. Shure earphones have a very wide range and superb fidelity, and can be considered 20Hz-20kHz. But, due to the many variations of individual ear canals, it is not feasible to accurately specify an exact frequency range or response curve. The best thing is to find a dealer who will let you listen to a pair and then you can make a subjective decision.