I have an Infinity center channel speaker (Not sure on model)and two rear Bose speakers (the two small cubes). For a Tunner I have a Pioneer VSXD1S, I have been having an issue with the center channel and need some help. What happens is I will be watching TV, Movie ect and sound is great then center channel audio goes to a lower volume for anywhere from a minute to 3 minutes and then it goes back to normal for ever sometimes or 30 minutes and then back to low and so on. What is doing this I checked the cable and it is fine.
You could swap out one of your front speakers for the center and see if the same behavior continues. If it does, then you know it's the receiver and not the speaker.
Ok so far no front speaker, I just have center and two rear speakers. Ideas on two nice center channel speaker and a sub? Also if it is the tunner, what is a nice one to replace it with? Thanks