TECPRO AD903 2 to 4 Wire Adapter

Specs:

• 4 wire via XLR 4 pin male
  
• Intercom ring (2-wire) via XLR 3 pin male and female (loop-through)
  
• Mic/line switches and 10 turn presets to external system input and output
  
• Sidetone null: 10 turn preset