Just want to jump in and share my experiment to my listening room.
I have a room 11x14. Four corner treated with bass trap 6" thick DIY from 703 fiberglass and two first reflection points. i was pretty happy with this set up.
Last night, i moved the love seat (fabric) to this room with one reason to have more seats

. When i listen to Peter Whites, the bass seem to be solid, louder than before. However, the high seem to be reduced. At first i thought it's due to addition chair to the small room, but later on (after 2 hours listening), my ears get used to the new sound (may be it's a psychological effects , who knows).
I can't explain why. If you experienced the same thing, please help me to understand

Thanks a bunch.