I have some M50's and a Denon 1905. I also have to turn the volume up to about -4 or -2 to get the volume I’m looking for. I don’t have a sub yet and I’m sure that will help my situation…….allot. The room opens up to the kitchen and dinning area and is about 2600+ cubic feet. But I was wondering if this may be a characteristic of the M50’s.