Its not logical that high back chair won't affect sound coming into ear cavity. Its either going to absorb or reflect, neither will sound natural, headphone effect to some extent. I have reflective room treatments behind listening position on side walls, makes my dedicated room sound larger than already is, very nice, why would I want to destroy that. Keep in mind, all room furnishings are in actuality, room treatments, one should try to maintain some control over their placement and reflective and absorptive properties.