Adamg, Before you invest in wire and power conditioners etc make sure you have exhaused your explorations regarding system set up and room treatments. Toe in is a huge issue for sibilence (or brightness in general). Many speakers are 'hot' when you are listening on or close to axis and need to be pointed straight ahead, or pointed so they cross over in front of the sweet spot (substantially some times). You might check with the manufacturer to see what their set up advise is, or identify your speakers and hope some one here is familar with them an can advise you.
You also need to be sure that 1st reflections points are delt with, that is floor, side walls, and if possible the ceiling. Just put some temporary stuff up and see if you solve your problem. If it works then you can seek a permanent solution. If not, then on to the next thing.
You also need to be sure that 1st reflections points are delt with, that is floor, side walls, and if possible the ceiling. Just put some temporary stuff up and see if you solve your problem. If it works then you can seek a permanent solution. If not, then on to the next thing.