I am glad that you have set it up and are enjoying it but I have to ask: What 4.0 files do you have that "activate the center channel?" There should be no center channel signals and if anything is coming through your center speaker, it must be the result of incorrect channel-mapping, unexpected pre-processing or mis-identification of the file as 4.0. Can you give an example or sample? When this occurs, are there still RF/LF/RS/LS outputs? What software is driving the e38?The exaSound has a very cool "exaSound Dashboard" which is widget on PC that shows the audio spectrum of each channel. This for me is mainly significant on 4.0 recordings as a few here and there seem to activate the center channel and now I can use the dashboard and zero that channel to get the true quad effect. Not that I couldn't do it before, but I had to go into the options menu and adjust.