The iFi iPurifer3 is a so-called 'USB Line Conditioner' that does several things: it filters electromagnetic noise from the 5V USB power very effectively, but it also regenerates and balances the USB signal, and removes timing errors (jitter) by 'reclocking' the digital signal. The result is a much cleaner reproduction, with more dynamics and timbre. The iPurifer3 is placed on the USB da-converter side between the USB cable and the USB input.
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