I understand what your saying but what I'm trying to get at is that the 25-80Hz range is played in case 1 by the M80s , in case 2 buy the EP500. If the AVR is set at 0dB, the the volume at 50Hz for example should be the same in both cases if the system is calibrated properly. If he had "double bass" enabled, it would be even louder in case 1. I still can't understand why his system sounds "louder" now.
"The problem is choice..."