SWR 550X Bass Head w, FootswitchWorld famous SWR power in a convenient 2 space rack unit. 550W at 4 ohms, all tube preamp, dual independent input jacks both compatible with active and passive basses, exclusive Aural Enhancer circuitry, Subwave with level control, limiter with defeat switch, active bass and treble controls, variable midrange EQ, effects blend control, and ultrahigh polished aluminum front panel with chrome rack handles. Back panel features include sidechain mono