Most rooms don’t need acoustical treatment.

This post should be called “most people don’t use room treatments but they should”. The room is the most important piece of the puzzle on putting together a great sounding room. Book, furniture, etc... are not replacements for a true absorption panel or an actual diffuser. If you have a dedicated room you must treat it correctly to get the best out of your equipment. If you have cheap stuff then it won’t matter much

+1 Millercarbon (best point)

Yes, and no. Past a certain point, the nuance any given system may behold can be more achievable with focused attention on surfaces and corners where treatment could be of considerable benefit. 

All rooms need treatment asap.

Diffusers?  What about 1d (lateral) vs 2d (scatter).

wouldnt 1 d be best if ceilings are flat?  Why bounce scattered waves off a ceiling???

Not only ALL rooms need treatment. but audio experience could be 75 % acoustical, 25 % basic good electronic design...

This % is variable, but NEVER in favor of the electronic design like 49% acoustical, 51 % electronic design...

This is pure science....

The sound you listen to come from the room /speakers, NEVER from the speakers alone in a small room especially...


It takes audio magazine market to make us believe that  "upgrading"  a10,000 dollars amplifier to a 100,000 dollars one, will be the key to audiophile experience.... Helmholtz has known much about sound perception one century ago than consumers magazine now...