just an idea, but I have found you can easily use a pair of the same or similar speakers as a very good center, if your power source can take the load ( and I know you have more than enough power plugged in lol) I use a pair of NHT SuperOnes as the center in my garage/ mancave without taxing the system and they do an excellent job. However, with the Marantz receiver they sounded like crap when wired in series, it didn't like the +16ohm load I guess... I have an extra single SuperOne you are welcome to try and could remove one of my center speakers so you can try a pair..... SuperOnes are very inexpensive on CL.