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A Full Digital amplifier is fully digital, it does not use digital / analog conversion before amplification. It therefore offer the function of a DAC, preamplifier, and power amplifier on its own. These FDA amplifiers are of a breathtaking quality / price ratio, and deliver unexpected performance in their price range.
They are to be preferred when the main sources are digital, thus limiting signal conversions to the strict minimum.
Even if some offer an analog input, this should be considered as an accessory. For main use with an analog input, it is better to favor a conventional amplifier.