- INCREDIBLE HI-RES CERTIFIED SOUND: The Hi-Res logo is a of exceptional audio quality, awarded only to audio devices capable of expressing the most excellent art. Unlike ordinary headphones, Pro 10 deliver sound up to 20 KHz for the richest, most nuanced listening experience. Large, 50 millimeter speaker unit drivers combined with neodymium magnets; powerful bass, clear vocal, and crisp high tones form stereo sound.