Good work!
IME (in typical home environments) acoustic treatments always result in the most “bang for the buck” improvement in sound.
The source can be an AM radio or a high dollar component system. If I’m concerned about the sound, I still choose to address the rooms acoustic conditions first.
As a generalization, I tend to look at the ceiling (and it’s height) first. Even if it’s not very low, it’s still where I first think to put some acoustic treatment. Too me it’s the first most unnatural boundary in a room (compared to outdoors).
Even most studio builds start there…it’s often referred to as “lifting the ceiling”…