[millsp]

Well without a processor you are not truly getting the same affect I.E. your center channel will be mixed audio just like the rest of the speakers not Voice dominant like a center channel is meant to be. That being said. If your Four channel amp has RCA outs which most do you could feed that to a small Two channel amp hide it somewhere and feed that center speaker with one of the channels. Then use the sensitivity controls on that little amp to control the volume of that center speaker. Set it at the highest level volume you listen to your system and you should have no problems. This should run you less than $100.