The Marshall JCM900 valve powered amplifier offers complete flexibility to ideally suit any type of player or size of performance. It features two independent channels, independent Gain and Volume controls, Treble, Middle, Bass and Presence tone controls, as well as Reverb level controls for each channel. The JCM900 has a Series Effects loop and Compensated Line Out to give the player the ability to customize their sound. There is a High to Low power switch that enables you to change between 100 Watts and 50 Watts.