Sony Walkman with High-Resolution Audio & 128GB Storage. The Sony NWZ-ZX1 is not an audio player for the masses. This is a player for the audiophiles who demand the utmost definition from their music collection, it's high-end digital audio amplifier, together with its ability to play uncompressed, high-quality audio files make it a contender in a market traditionally fulfilled by specialists like iBasso and Astell & Kern. And buy this Sony NWZ-ZX1 Walkman® with High-Resolution Audio and 128GB Storage Was £549.00 Now £494.10.