The Astell & Kern 300 is a portable HiFi audio system which reproduces a high-resolution sound source (MQS) as it is recorded in a studio. Femto Clock was installed and PEQ was applied to deliver the original sound. The design concept is “light and shadow”, which represents the innocence of a shadow that does not reflect the light. The shadow without a splitting light is embodied moderately and nicely. It features the purity of the original sound of Astell & Kern. The home key is made with a metal touch and operated with micro pressure. The frontal area of the knob symbolizes the wavelength of a sound that can fill a gap between fine tunes.