The Look & Texture of Quality: Offers the look & feel of the top-class A-S2000, with elegant aluminium front panel & silky touch volume/selector knobs. You can feel Yamaha’s commitment to quality when you touch the knobs. Pure Direct: Music signals travel the shortest possible route, bypassing the buffer amp & tone, loudness & balance controls to virtually eliminate any signal degradation for the purest sound quality. Highest Quality Parts: The quality of each individual part, as well as how they work together, basically determines the sound quality of any component. Yamaha uses only very high quality parts, carefully selected & tested. New Speaker Terminals: These high grade speaker terminals have gold plating for best connection & outstanding durability. The pitch between jacks is wider for easier insertion. Centre bar to reinforce the internal structure: Centre bar reinforces the internal structure to further prevent vibration from affecting the sound quality. Dual aluminium-extruded heat sinks: Dual aluminium-extruded heat sinks ensure effective heat dissipation & help achieve crisp, clean sound. Continuously Variable Loudness Control: Our ears lose sensitivity to high & low frequencies at low volume levels. This control lets you turn down the volume while maintaining the optimum frequency response. Also known as:AS500, AS-500, A-S500