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RE: No Anti-Aliasing Filter

> If I recall correctly, Charles has said that on his A-to-D, there was no
> filter in the Listen mode...

There is an anti-aliasing filter, a moving-average type (12 samples long
IIRC), which starts rolling off a little below Nyquist and has a slow
rolloff above. I examine the behavior of this filter both in my original
review of the QA-9 (in the frequency domain) and in my article on A/D
conversion linked to above (in the time domain).

John Atkinson
Technical Editor, Stereophile

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