Room Treatment

Acoustic panels absorb sound waves to reduce echo and reverberation, making a room quieter and more controlled. They’re usually made of foam or fabric-covered insulation and placed on walls or ceilings.

Diffusers, on the other hand, scatter sound waves to create a more natural and balanced sound without making the space feel "dead." They’re typically made of wood or plastic with uneven surfaces.

If you want a controlled sound, go with panels; if you want to keep the room lively while preventing echoes, use diffusers, or better yet, a mix of both.

A lot of good info already provided. The part mentioned about over doing it with absorbers is of the most importance as it happened to me. Bottom line, a combo of bass traps, absorbers, absorbers/diffusers and diffusers in the right combination will get you the optimum results. What that combination is will be specific to your room. It's basically like equipment, cables, fuses, etc... There is not one for all fit. The best I can help anyone with is to take a look at my house of stereo acoustic setup under my details, system. 

@lalitk 

I have every square inch of my walls covered with 5” of rock wool, and every square inch of my ceiling covered with 14” of rock wool. The floors mostly covered either Moroccan cotton rugs  

I have a very dead, semi-anechoic room. It works perfectly. You can hear the difference when you walk in, before any music is played. 

So I am wondering what you mean by overdoing it? 

So I am wondering what you mean by overdoing it? 

@unreceivedogma signs a room is overtreated...the room feels emotionally uncomfortable as our brains expect reflections...you start removing absorption and find improvement...the room feels overly warm due to a scarcity of high frequency wavelengths...the room sounds smaller than it actually is.