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What is DSD?

DSD is a 1 bit sigma/delta recording system running at a very high sample rate. Where a CD is sampling at 44 thousand times a second, the effective sample rate with DSD is 2.8 million.  It is a significant step closer to the infinite sample rate of real analog recording. And thus, the feel you get when you listen to a pure DSD recording is a very analog feeling. It gives us back what we lost when we went to digital in the early 80's.  Even if the source for a DSD file is an analog tape master (that has not gone through a digital process), the feel you get when listening is like listening to analog tape. What you hear feels more believable.  With DSD there is no such thing as digital word. It is just a one bit stream. If you send it to a low pass filter, you can actually hear music.