This is a room measurement from Edge of Tomorrow and Tron. There's a lot of bass below 10Hz. Also notice how it rolls off around 15kHz. Probably all of it is a combination of the source and AVR, not the speaker or microphone.
https://photobucket.com/share/e202dcf0-a653-4f94-ad1b-1c02fc2c88aa
https://photobucket.com/share/a0c33052-3245-4be1-bcdb-31187731fa08

