A terrific practice or backstage amp,the Ibanez SW20 Sound Wave Bass Guitar Amplifier has a closed-back cabinet for enhanced low-end, and an 8" coaxial speaker for wider frequency response. Bass, mid, treble, and presence controls let you dial up the sounds you want, and a limiter keeps you from shredding the speaker. Other features include a variable input with 10dB gain, CD inputs for play-along, and headphone out for silent practice.