Stereo Passive Direct Box. Samson's MD2 Pro Stereo Passive Direct Box combines two premium direct boxes in a single case. Rugged, roadworthy construction and two shielded transformers provide high-quality signal connection solutions for a variety of live sound and recording applications. The MD2 Pro is perfect for converting unbalanced stereo line level or instrument signals from keyboards, electronic drum kits, acoustic-electric guitars and more. Features include:; All-metal, impact resistant design; Dual Samson STLX Mu-Metal shielded transformers; Stereo/Mono sum switch; Dual 3-position 0dB/-10dB/-20dB attenuation switches; Dual Ground Lift swithes; Dual 1/4"; Inputs and Thrus; Dual balanced XLR outputs; No Phantom or Battery power required