I'm not certain of what's in a Bybee or why it works and we don't know anything about the E-Mat. With only a single E-Mat trial on such a system, it maybe difficult to define a difference.
However, without Bybees and using six E-Mats, the results are instantly apparent and after two weeks, greatly superior. I'm having so much fun listening to recordings I thought were inferior. I thought that the Quartetto Italiano Philips recordings (especially the Beethoven Quartets) were too distant and reverberant. After the E-Mat installation and two weeks, the sound is more direct, more resolving of each instrument and more dynamic. Great performances as well.
However, without Bybees and using six E-Mats, the results are instantly apparent and after two weeks, greatly superior. I'm having so much fun listening to recordings I thought were inferior. I thought that the Quartetto Italiano Philips recordings (especially the Beethoven Quartets) were too distant and reverberant. After the E-Mat installation and two weeks, the sound is more direct, more resolving of each instrument and more dynamic. Great performances as well.