I haven’t yet taken the time to disassemble my stereo setup and take my receiver out, but after doing some research it looks like I’m not the only one having trouble getting my center channel to work. A Google search of “STR-DE545 channel silent” led me to this page that has some useful info. I definitely need to at least pull the receiver out, clean it, and check the center channel terminals. This will be the first time I’ve bought compressed air in a number of years. Hopefully I can get this fixed and enjoy the new center speaker!