Stageline Pro Co DB1 Direct Box Floating Transformer-Balanced XLR Output for Maximum Isolation SPKR Mode Handles Amplifiers Up to 600W RMS Hi-cut Filter Reduces Distortion. GND/LIFT Switch Eliminates Hum and Buzz Heavy-Duty Steel Enclosure for Super-Strength and Shielding. Recessed Switches and Connectors Resist Damage Passive Design Requires No Batteries or Phantom Power