Astell & Kern KANN Cube. A big screen portable music player, with dual flagship home audio dac chips for fantastic clarity and a huge built in amp to use with full size headphones. The combination of dacs, headphone driving power and minimal distortion is rarely found in desktop gear, let alone a portable product. (KANN Cube is significantly more powerful than Astell & Kern's own desktop dac/amp.)
The KANN Cube is a large unit - its over a pound of hifi - and has a fantastic clear, powerful, dynamic sound. It is about the size of 3 phones stacked so it is not a daily back pocket type of product, but if you want something that can be taken with you (around the house, to work, holidays, etc), the sound quality is similar to models at twice the price.
Similar to the other A&K players with the new software, you can choose 4 of the currently 20+ music apps that can be sideloaded onto the KANN Cube from a Windows or Apple computer. You download the app and copy/paste to the KANN Cube. More info here. Spotify, Tidal, Qobuz, Deezer, Soundcloud, Sirius, Apple Music and more are options.
Some major features and bonkers specs: