Unlike most of the full-sized headphones marketed to Apple device users today, P3 doesn’t attempt in any way to emulate the glossy plastic looks of Monster’s ubiquitous Beats by Dre family; instead, it’s a study in class at a comparable price. Sized to nearly cover average adult ears, P3’s speaker housings combine three materials: brushed black metal ovals sit atop soft-touch rubber-coated rounded rectangles and padded fabric…