My room has no Drywall surfaces at all, and bookcases on 3 walls for sound wave diffusion.
Walls are velvet stapled to wood studs over Roxul (controls and light and sound reflections and acts as a bass trap)
I carefully setup my speaker locations, measured and calibrated my Audio and Video for peak performance.
(REW/UMIK-1/MiniDSP 2x4HD/Spyder5/HDFury Vertex)
I've spent a substantial amount in equipment upgrades in just the last 3 years for 4K HDCP 2.2/HDMI 2.0
and moving from 7.1 to 7.4.4 ATMOS/DTS:X was a Total Audio Game Changer!
I still have my 10 y/o RX-V3900 (left) repurposed as an amp utilizing the Multi-Channel inputs to power my 4 Presence Speakers,
My current RX-A3070 (right) replaced my 3 y/o RX-A3050, drives the 7 bed layer channels only.
...then to top that off added 9600 watts of Funk Audio Sub Power up front,
a pair of 15" Velodyne 2000w rear near field subs and 4 Crowson Motion Actuators (500w) x 4 running off the D-501 amp.
On the Video side, a JVC X750 (RS500) Projector retired my 8 y/o Epson Projector, and a 65 OLED replaced my 10 y/o 50" Pioneer Kuro.
120" powered screen drops from the ceiling when the projector turns on... (8'-6" viewing distance)
My 12 year old RX-V1800 Yamaha is still working, used for a different zone in another room with my Kuro.
No way it can compete with modern AVR's and smart TV's these days....like I said.....Stone Age!
My next upgrade will be Top Middle Overhead Speakers (for 7.4.6)
I already have the matching speakers, just not wired in due to Yamaha lagging behind D/M