The Blackstar U250ACT is a Unity Series 15" 250W powered speaker cabinet designed to deliver powerful amplification for bassists in the studio, onstage, or at rehearsal. Its custom-designed Eminence Opus 15" speaker handles 250W at 4 Ohms. A passive 1/4" speaker input enables it to function as a traditional speaker cabinet, while the active XLR-1/4" combo input allows a connection from an external preamp or a Blackstar Unity Series bass amp.An XLR thru jack functions as an output to another Unity Series active cabinet and features a ground-lift switch to minimize hum. A dedicated volume control is provided for the active section of the U250ACT. The sturdy MDF cabinet has a top-mounted carry handle for easy transport between gigs or rooms. An IEC power cable is included.