api 500 slot500VPR is a lunchbox from API tailored to host up to ten 500-series modules. The rack is wired to PIN 2 hot, and comes with a dedicated tri-polar power supply (L200PS). Both inputsThe 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,