Most rooms don’t need acoustical treatment.

I have a small listening space that also doubles as a computer work station. The room is quite "lively" with no soft furnishings. I lived with it that way for years before deciding that something had to be done. Found that several large glass-covered pictures were mucking up the sound, so I removed them. I then experimented with sound absorption using beach towels taped to the walls. Once I determined what was needed, acoustical panels were ordered and installed. Best money I ever spent for sound improvement.