Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.
Not really a tweak, but it serves the same function. I find the most favorable setting for reference use is the 'Sharp' setting, while the 'Slow' setting reigns-in the leading edge transients in a manner that can perhaps be considered a signal shaping processor "contour function" of sorts without great impact on the overall tonality, to my ear.
With the 'Slow' setting, the subjective effect is not particularly "less relaxed", but the top-end is less spotlighted so the treble energy seems more subdued in comparison. This finding could contribute to a listener wanting to playback a particular track on the 'Slow" setting in order to have a more immersive soundstage presentation for example; a bit less front row perspective. YMMV
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Topic - ESS Sabre Filter Settings - Duster 22:15:05 03/20/17 (4)