Roland CUBE-20XL BASS Compact 20-Watt Bass Amplifier 20-watt power output 1 x 8 in speaker POWER SQUEEZER switch maintains tone while dropping output volume 6 x COSM bass amp models: SUPER FLAT, FLIP TOP, B MAN, BASS360, SESSION, and CONCERT 810 7 x effects including chorus, poly octave, delay, and reverb types