Sonnet Cable, Power, for one Avid HDX card in Breakaway Box, Echo Express III-D/R, xMac Pro Server & xMac mini Server - Professional Audio Design, Inc | Professional Audio Design, Inc
Power Adapter (for Echo Express SE II/III/IIIe & Echo 15 Dock) – Sonnet Online Store
Sonnet Technologies Echo Express SE I Single PCIe Slot, Thunderbolt 3 Expansion Chassis | Sweetwater