Yamaha XP7000: Power Amplifier Excellent sound quality realized by careful selection of parts, design emphasizing on sound quality and vibration tolerance: Superior sound quality equivalent to upper-class models has been realized by circuit design and careful selection of parts focusing on sound quality, and the inheritance of vibration tolerance developed for the Yamaha PC-1N. The Yamaha XP7000 features tight low tones, full and rich high tones and abundant, stable mid-tones. Especially, the Yamaha XP7000 features high resolution for spoken words and vocals.