The Yamaha A-S501 amplifier keeps every tone as close as possible to the original sound. Thanks to Yamaha's ToP-ART-design, the interior is completely symmetrical. The left and right channel in the amplifier are separated so they don't influence each other. The Pure Direct option provides undistorted music reproduction by transmitting the signal over the shortest possible route. All possible adjustments to the tone are bypassed, so you hear the music in its purest form.