Excuse me for the delay in responding to your post. I've been dealing with some serious health issues. Hopefully I am past that now.
I have Philharmonic HT R & L, Philharmonic HT Center Channel and Philharmonic True Mini Monitors for rear speakers. The MLP is approximately 11 ft. from speakers and the speakers are 11 ft. apart. The listening room is of moderate size - 32x25. I have the system set up in the middle of the long side. I don't listen to it very loud, maybe -10 max to -20. I to haven't measured the sound levels but will soon.