The differences between DVD an BluRay are obvious and measurable (eg. 720x400 vs 1920x1080). Similarly, 128Kbit MP3 is the bare minimum for recognizable music, but not adequate to capture everything we might normally hear. Adding more bits makes a big difference, up to a point, assuming the amp/speakers are not the limiting factors.
These are things that have a basis in strong tech facts, not snake oil, and the differences they make are measurable by pretty much anyone with a bit of gear (or a large screen in the case of BR).
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