Two Knowles drivers paired with a beryllium-plated dynamic driver placed near the opening of the sound tube, controlled by a physical + electronic frequency crossover system masterfully cover the entire frequency response range.
High-frequencies: the Knowles RAD-33518 driver provides extremely clear sound with well-extended yet smooth treble.
Mid-frequencies: the ED-30262 gives sweeter and fuller vocals as well as a wider soundstage.
Low-frequencies: a 10mm-beryllium-plated diaphragm dynamic driver provides explosive bass with shocking authority.