philiphifi
pfm Member
hi - perhaps a qualified engineer could help with this question. Many (many) years ago, i had to learn electronics design and it was gospel that one needs filter (forget the order of the filter for now) for anything above 20kHz to avoid higher freq reflection into the audio freq range. Now i read that An and others are now using filterless DACs. How do they work ? If it is the case that the noises are non audio-able then what have they been teaching students!