It is an excellent idea to look at acoustics...but where do you sit? So many sit with a wall right behind their head - if that is the case then start by finding a better listening position.
FWIW - Broadband is the most effective treatment in any space. The "dead room" issue comes from applying too much mid and HF absorption from thin "cosmetic" panels. Diffusers are necessary in small spaces - if you have a speaker within two feet of a wall or you sit within 3 or 4 feet of a wall then diffusers will be essential. Diffusers can also help in asymmetrical situations. The best place for diffusers will be close to the listener - in a very small room they are essential.
FWIW - Broadband is the most effective treatment in any space. The "dead room" issue comes from applying too much mid and HF absorption from thin "cosmetic" panels. Diffusers are necessary in small spaces - if you have a speaker within two feet of a wall or you sit within 3 or 4 feet of a wall then diffusers will be essential. Diffusers can also help in asymmetrical situations. The best place for diffusers will be close to the listener - in a very small room they are essential.