The Ibanez Promethean P20 Bass Combo Amplifier is a bass guitar amplifier combo, with an output of 20W, through an 8" speaker, with 4-band tone control. The P20 amp features a simple 4-band tone control to adjust the tonal character. The included aux input allows you to play along with a connected MP3 or CD player. The headphone out is great for bedroom jam sessions or sound checks at rehearsal. The main features of the Ibanez Promethean P20 Bass Combo Amplifier include: Output: [email protected]? Speaker: 8" Controls: High, High-Mid, Low-Mid, Low, Master, -10dB Input Pad I/O's: Input, AUX Input, Headphones Out Cabinet: Closed-Back Size: 330 x 350 x 310 mm Weight: 7.8 kg