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Answer for the clue "Hearing without advanced sort of headphones - this sort of filtering improves clarity ", 9 letters:
trilinear

Word definitions for trilinear in dictionaries

Wiktionary Word definitions in Wiktionary
a. having, or bounded by three lines

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Trilinear \Tri*lin"e*ar\, a. (Math.) Of, pertaining to, or included by, three lines; as, trilinear co["o]rdinates.