Yamaha RS500BL Stereo Receiver (Certified Refurbished) This Certified Refurbished product is tested & certified by Yamaha to look and work like-new. The product includes all original accessories, and is backed by a 1 year warranty. ToPART (Total Performance AntiResonance Technology) design uses a symmetrical layout for accurate sound field reproduction and the ART Base to eliminate effects from external vibration. Music signals travel the shortest possible route, bypassing the buffer amp and tone, loudness and balance controls to virtually eliminate any signal degradation for the purest sound quality. These high grade speaker terminals have silver plating for best connection and outstanding durability. The pitch between jacks is wider for easier insertion. 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 and tested.