The J48 is an active 48V phantom powered direct box featuring a -15dB pad, 180º polarity reverse, a merge function to mix two signals to mono, an 80Hz high-pass rumble filter, and ground lift. The design is optimised to produce maximum headroom while working within the limited current available from standard 48V phantom power. By employing a switching power supply, the J48 is capable of peak transients to 9 volts without choking. The result is reduced harmonic distortion and significantly improved dynamics. A welded I-beam construction equips the J48 for life on the road.