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Allen : how come DSD doesn't need a DAC? Doesn't that mean SACD is analog?

I read this in one of the reviews of your 777ES Mod;

"The DSD signal completely bypasses Sony's DAC and multiple op-amp audio output section, and
is fed directly to the new output stage, using no DAC at all. Conveniently, Sony's digital chips also convert the
redbook signal to a DSD-like signal, so it can also be reproduced without any DAC."

http://www.dagogo.com/SonySCD777VSEI.html

Now.. I remember on the early SACD's that they showed it was the case, that all you needed was a high pass filter.. but I just don't understand how this works.

Are you basically taking an amplified signal from the laser, running it through a analog filter and then pumping that through a amplification stage?

Doesn't that really make SACD analog? What would have been the Japanese engineers reason for doing it the way they did? There must have been some trade-offs, even if only theorectical.

Daniel.

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