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    Can FiiO K5 Pro damage Sennheiser HD 660 S at gain 3?

    @gimmeheadroom Thank you! Happy to know that there is no danger of damage. The gain switch and volume knob both change the decibel value, so one may expect that setting a gain 3 is equivalent to setting at gain 2 but with the volume knob raised, but this seems not be the case: in the first case...