Acoustic Basics
Use simple room changes to improve clarity before chasing complicated calibration.
Control reflections
Bare floors, windows, and parallel walls can make dialogue harsh or blurry. Rugs, curtains, bookshelves, and absorption panels can all help, especially at the first reflection points between the front speakers and the main seat.
Separate absorption and diffusion
Absorption reduces reflected energy; diffusion scatters it. Beginner rooms usually benefit first from rugs, curtains, and a few broad absorption points before worrying about specialty diffusers.
Treat the first problems
Start with the loudest distractions: flutter echo, rattles, HVAC noise, projector fan noise, and boomy bass. Fixing those usually matters more than tiny setting changes in the receiver menu.
Do not over-deaden the room
A room with too much thin foam can sound dull while still having bass problems. Use thicker broadband treatment where possible and keep a mix of soft and irregular surfaces.
Calibrate after placement
Run receiver room correction after speakers and the subwoofer are in their best practical locations. Calibration can smooth a setup, but it cannot rescue a center speaker buried in a cabinet or a subwoofer placed in the worst room mode.