The Radial J48 Mk2 Premium Active DI is a professional active direct box that has been optimized to produce maximum headroom while working within the limited current available from standard +48V phantom power. By employing a unique switching power supply, the J48 is capable of peak transients to 9V without choking. The result is lower harmonic distortion, half the inter-modulation distortion and significantly improved dynamics over other DIs.