According to one embodiment, a heatsink includes a base and heat radiation fins placed on one of surfaces of the base and arranged in parallel to each other with a submillimeter narrow pitch. The factoring in of emotional state can be combined with other performance metrics that can include, for example, any suitable metric for expressing or describing agent performance or agent skill level. The inner surface is generally flat and preferably slopes towards the outer surface considered in a direction moving towards the extremity of the tip at an angle of slope of no more than 8 degrees. Acoustic damping material can be included in the various leakage paths in order to achieve the desired properties, depending on the type of speaker to be used, the acoustic design of the headphone, the mechanical properties of the headphone body, and the desired frequency response characteristics of the headphone.