Ibanez Promethean 20W 1x8 Bass Combo Amp Power: 20W (solid state) Single channel Single input Speaker: 1x8 Ibanez Controls: 4-band EQ, volume -10dB input pad Aux. input Headphone output Closed-back cabinet Dimensions: 12.9 in. x 13.78 in. x 12.2 in. Weight: 17.19 lbs. The Promethean 20W bass combo from Ibanez comes loaded with a single 8-in driver, and simple controls for any level of player The 4-band EQ allows for easy and nuanced tone shaping, the -10dB pad accommodates basses with active pickups, the aux input lets you play along with your favorite tunes, and the headphone output allows you to practice silently while still having great, smooth bass tone in your ears