With a selectable 125 or 250 watt KT88 vacuum tube power section, active treble and bass control with a passive mid knob, and a five-position voicing switch, the Mesa Boogie Bass Prodigy Four 88 Bass Head stands proudly as the company's next step in amplification technology. Packing a preamp built on three 12AX7 vacuum tubes which puts the power into the EQ and voicing options, the Prodigy's additional balanced XLR line output and buffered effects loop make it one of the most powerful and versatile options on the bass market.