The sony ier-z1r is a flagship triple driver hybrid earphone, and represents all of sonys audio expertise in a beautifully crafted package. On the exterior, the zirconium alloy earpieces possess a finish and lustre akin to jewellery. Despite the size and weight of this unique design, the ier-z1r remains comfortable and stable in the ear thanks to the thoughtfully designed pre-formed earguides and 13 different variations of included eartips. The ier-z1r includes a standard 3.5mm stereo cable as well as a 4.4mm balanced cable for maximum performance with premium audio players such as the sony nw-wm1z. the sony is a triple driver hybrid, with a magnesium dome 12mm dynamic driver for bass, a balanced armature driver for midrange, and a unique coaxially mounted 5mm dynamic super tweeter for high frequency response up to 100khz. The result is a tremendously cohesive sound with natural timbre throughout the frequency range. Overall in terms of signature the z1r places a mild emphasis on lower sub-bass frequencies and upper treble, but avoids sounding artificially harsh or bassy.