api 500 slotThe lunchbox comes standard with a +48 volt internal phantom power supply, bussed to pin 15 for interface with the API 512c Mic Preamplifier. API makes several modules for the 500-6B,API 5006B 6 Slot Hh Current Lunchbox. The API 5006B 6 Slot Hh Current Lunchbox is a 6 slot rack desned to accept all API standard 5.25″ X 1.5″ modules