Since its introduction almost 5 years ago, the DirectStream DAC and DirectStream Junior, have altered the expectations of audiophiles worldwide, and proven their ability to be upgraded in the field at no cost to their owners—obsolescence is obsolete. The Sunlight operating system upgrade provides further reductions of jitter sensitivity, lowers audible noise, improves upon the work Ted Smith performed in Windom. The sound quality of Sunlight is significantly better than any iteration before it. The upgrade is free via download and self-installation or by purchasing this pre-formatted SD card, or USB memory stick (DSJ only) delivered to you ready to install. Instructions for the upgrade are here.