Studio balanced line output module / zSUM-4 expander.

zOUT provides two impedance balanced 1/4" (6.35mm) line outputs wit adjustable gain and short-circuit protection.

http://motovilo.com/zsum-4/zout/

• 15 mA +12V
• 15 mA -12V
• 0 mA 5V
• 46 mm Depth

No info about availability.