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Werner, you already know this stuff.

Virtually all commercially available DAC chips operate with a "hold" function between samples.

Without any playback filtering, the signal will have severe "stairsteps" in it. This is NOT reconstructing the original signal. A (low-pass) reconstruction filter is necessary to get rid of the stairsteps.

If you do a spectral analysis of the unfiltered (stairstepped) signal (changing from the time domain to the frequency domain), there will be image frequencies above Fs/2. No audio equipment in the world (let along a pair of human ears) has infinite bandwidth. So there is always some filtering going on.

My post was responding to Todd's misconception that a reconstruction filter adds "ringing" to the "raw signal". The truth is that the digital signal already has ringing built into it because the ADC has a sharp low-pass filter. Sending any signal through a sharp low-pass filter will result in ringing, even if that signal is never digitized.

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