Yamaha AR-1500LIVE: your new guitar amplifier comes with 15 watts RMS output power and is equipped with a 20 cm (40) speaker. It has two channels: a clean and a drive channel. The clean channel produces lively sound without distortion, making it suitable for electric acoustic guitars and cutting during playing with non-distortion sound. The drive channel with its two volumes produces various kinds of distortion sound. You can select the channels using the VOLUME (PULL SHIFT) knob or the foot switch connected to the F.SW. terminal.