Resbeck's suggestions re room acoustics is a good one. A lot of brightness stems from 1st reflection points on walls, ceilings, and floors, as well as the amount of toe in used. Before you start spending money on cables make sure you have your set up down. If you want help, describe your room dimensions, openings, furnishings, speakers, present set up (location of speakers and listening position). Don't know that you need to hire a consultant yet though.
