The Radial J48 is a phantom powered active direct box that employs a digital switch-mode power supply to increase internal rail voltage for greater headroom. Linear from 20Hz to 20kHz, the J48 is ideally suited for bass and acoustic guitars where maximum dynamic range is desired in both live touring and studio environments. Features -15dB pad, stereo to mono merge function, polarity reverse, 80Hz rumble filter and ground lift.