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What is a Switch Mode Power Supply (SMPS)?
An SMPS (Switch Mode Power Supply) is a high-efficiency power supply specifically designed for use with our amplifier modules from the UcD™ and NCORE® families. These power supplies are suitable for mono and stereo setups, as well as multichannel applications.
https://www.hypex.nl/FAQ-DIYClassD/FAQ-Hypex/General-DIY-Product-Support/General-OEM-Product-Support/What-is-a-Switch-Mode-Power-Supply-SMPS