Listening smartphone is very good, but this is not the place to expect the main use. The quality is real, but the semi-open design hifiste inconvenience the neighborhood. The detachable cable is provided with a control that allows receiving calls while listening. A second press during a call puts the caller on hold without ending the call. Tested with the new Mobile Sosh, android.
In Hifi, in my opinion the optimal use of Fidélio L2BO, my first point concerns the length of the cable. I bought a Grado cable 4.50 meters for 35, the certainty of a perfectly neutral cable checks listening. I have not found an extension cord on the Philips website, it is well hidden! Tested on many musical style headphones reaches its sound better after ten hours of running. Very good and very musically neutral, helmet excels precision, dynamics and fidelity. Excelling on music Jazz, Rock, Modern, he performs in small formations. By cons on large orchestral ensembles, there is a lack of breadth. However, we must consider the Fidélio had respect to its price. This ranks the top in this category currently in vogue with new developments that are increasing, including among specialists Hifi.
In conclusion, this headset likely to fill you up. Hearing is clear, precise and detailed, the bass well controlled without excess and impeccable comfort. Just an extension to predict forgetting stuff two bullets that would affect listening.