The AMP HEAD is a compact, but high-power headphone amp based on four OPA2604 or NE5532 opamps. It’s ability to sum and mix multiple inputs (via 10k resistors) make it a great option for a headphone monitoring solution.

• Low distortion: 0.001% THD
• Balanced input
• Volume control
• Buss connector for slaving multiple units
• Drives 6-800ohm headphones
• Easy to add mute and mono switches
• Several units can be powered w/ IDC connector

Price: $35 AUD for full kit
More Info:

• The JLM forum build thread