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I need a third channel; can I add one amplifier to the same power supply?
Yes, with each mains powered NCORE® amplifier you can add one NC100HF tweeter channel amplifier. It is not possible to add 2 pieces NC100HF to one Mains Powered NCORE® Amplifier.
https://www.diyclassd.com/FAQ-Hypex/Mains-Powered-NCORE-Family/I-need-a-third-channel-can-I-add-one-amplifier-to-the-same-power-supply