Product Information The Ibanez Promethean P20 is a compact, ultra-portable practice bass amp. It features a closed-backed cabinet housing an 8" driver with a 4-band EQ and -10dB pad switch for use with active electronics. Additional features include an auxiliary input and a headphone out, making it an ideal, all-around practice amp. Specifications output 20W@8Ω speaker 8" Speaker controls High, High-Mid, Low-Mid, Low, Master, -10dB Input Pad i/o's Input, AUX Input, Headphones Out cabinet Closed Back size (mm) 330mm(W) x 350mm(H) x 310mm(D) weight 7.3kg