The first time no. The second time I was getting ready to change out the center channel, but had noticed that dialog on a lot things seemed weak. So, I checked because of the first instance. So I guess that's no too. I'm now running Mackie HR824s across the front. I don't fiddle. I just calibrate and check it a couple times a year. Other than the Mackie upgrade the system has been the same since I bought the 990 in May 2006.