Mackie MDB-1A Active Direct Box Features:

• Clean, uncolored, and acoustically transparent
• Proven “Built-like-a-Tank” construction
• Premium active analog circuitry
• -20dB pad protects your input from high-level sound sources
• Merge switch sums a stereo input (utilizes the Thru and Input jacks) down to a mono output
• Low Cut, Ground Lift, and Polarity switches
• Requires external +48-volt phantom power source