Mackie MDB-1P Di Box set of 4 pcs. Mackie MDB-1P Passive Direct Box is ideal for live/studio applications and performs with both low noise and distortion. On board is a high-impedance jack input with thru output, a balanced XLR output with ground lift and a built-in -15dB pad switch for high-level sources. The MDB-1P is contained in an extremely robust enclosure and is a practical and reliable companion for every applicable situation. Passive Direct Box 20Hz-20kHz Frequency Response Resolution: 24-bit/96kHz High-Impedance 6.3mm Jack Input with Thru Output Balanced Low-Impedance XLR Outs with Ground Lift Pad: 0dB/–15dB Noise-Free Operation Plug and play I a selling on this auction 4 pcs. of MDB - 1P.