This document discusses two audio systems that Meridian offers - one that uses existing analog speakers and one that is fully digital from end to end. The analog system includes the Meridian HD621 HDMI processor to separate audio and video signals, the G65 audio processor to control sources and surround sound, and G55/G57 power amplifiers. The digital system is centered around the 818 Reference Audio Core processor and Control 15 streaming system, driving Meridian DSP digital active speakers. Both systems are compatible with various source components and offer upgrade paths to remain state-of-the-art.