I'm thinking that most mfgrs. see very little value in the tweaks that are heralded by many audiophiles. If the stuff really worked, especially the cheaper tweaks, you can bet they'd be incorporated into the design....
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Why do designers/manufacturers...?
If audiophile grade feet, power cords, and fuses can really improve SQ, why don't high end designers/manufacturers just incorporate these audiophile grade components at the time of build? Why sell an under-optimized item that can be easily improved upon by the owner or a modder?