I had previously been using an older Sony str-de845 receiver with jbl sat10 speakers and about a year ago I noticed that the center channel sounded harsher than it used to. I thought that the speakers were going so I purchased a 5.0 set of the Pioneer speakers designed by andrew jones and my new center speaker still sounded harsh. I had even set all my speakers to small and set the crossover at 90hz. I do not use a subwoofer. I started thinking there might be a problem with my receiver so I bought the Yamaha rx-373 receiver and that solved the problem. The sound on this receiver is much smoother and there is no harshness coming from the center channel. Does anyone have any idea what could be making my center channel sound harsh on my Sony receiver?