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,The 500VPR is internally wired for PIN 2 hot, and comes with the API L200PS. The inputoutput jacks are both XLRs. The 500VPR can hold up to ten API modules.