Roland CUBE-20XL Bass 20-Watt 1x8-Inch Bass Combo Amp Ultra-compact 20-watt bass amp with custom-designed 8-inch speaker Six COSM amp models onboard Seven effects, including the new DRIVE and POLY OCTAVE POWER SQUEEZER for big, rich sound at low volumes; great for home practice and other volume sensitive environments Three-band EQ for fine-tuning your sound