EDT, T20, T30: psycho-acoustic

[narut titayangkurn]

EDT, T20, T30:
Hi there, the measurement can give us the values of this RT time.
My questions are

- Is there any book that describes how human feel about this EDT, T20, T30
- If we are to optimize the room to have an optimal RT time which value should we focus on?
- Is there a standard that outlines an optimal RT value for specific room size, ISO? ASTM?
- Which value among EDT, T20, T30 that "audiophile" should focus to?

I really appreciate your inputs

 

[John Mulcahy]

There are recommendations in ISO3382, you can find them at http://www.nti-audio.com/en/functions/reverberation-time-rt60.aspx for example. There is more info on the general topic in books like Master Handbook of Acoustics.