MOON 820S Reference Outboard Power SupplyThe 820S from MOON is a Reference Outboard Power Supply which can upgrade the performance of the 740P, 610LP, 810LP, 650D, 750D or 780D. Making use of everything Simaudio knows about power supply design with respect to circuit layout, filtration and regulation has gone into the 820S. Designed to elevate the performance of products that already perform stratospherically at their price points, the 820S was created through painstaking R&D, creative