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RE: It is how it sounds that matters!

This might bore you, but........

"I don't know if the biggest impact is the filter that removes most of the pre ringing or the one that rolls off the response for a bit reduced transients."

Filters don't really "remove" ringing, they actually add it....... The "ringing" is literally programmed as numerical coefficients, representing the filter's "impulse response" characteristic......

The filter also "flattens" the HF response. (A non-filtered signal is more "rolled off" than a filtered one.) The filters with less ringing just happen to flatten the response somewhat less than filters with more ringing.

The "rolloff" in the HF response of digital audio playback is caused by a reduced "average" output level due to modulation or "beating" of the HF signal, as it approaches half the sample rate (22.05 kHz for CD playback). The ringing in essence "fills" in these nulls, "smooths" out the modulation, which raises the average HF output level to "flat".

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