Too dead? - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

Old 02-10-10, 01:48 PM Thread Starter
Senior Shackster

pepar

Join Date: May 2006
Location: On an island
Posts: 108

Quote:
glaufman wrote: View Post
You can review our Zero Tolerance Rules here:
http://www.hometheatershack.com/foru...php?do=cfrules
Got it! Surprised about the "euphemism" status of the word, but I will comply. MOOO!
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Old 02-10-10, 02:29 PM
Elite Shackster

Greg

Join Date: Nov 2007
Location: NY
Posts: 2,601

Sounds good!

-Greg

Don't worry... nothing new here, I've already made that mistake. Trust me.
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Old 02-11-10, 12:07 PM
Senior Shackster
Bill

Join Date: Sep 2009
Location: Austin, TX
Posts: 676

Quote:
glaufman wrote: View Post
In the lower right corner of the RT60 window there's a dropdown called "decay measure where you can select T30, but I can't advise you of theimplications. Over my head.
I'll take a shot at it. The choices here match the choices available on the Impulse diagram. T20 and T30 calculate the best fit line where the levels drop from -5dB to -25dB and -35dB from the initial value. These are done using linear regression fits. Topt appears to look at several different floors, -25dB, -35dB, ..., and determines of these which gives the best fitting curve and chooses that one. I think the greatest value in having a choice is to try different values and see if the results are stable, a sensitivity test to verify that the choice of algorithm is not biasing the results.

The help under the Graph Panel for the Impulse Graph has a section titled Impulse Response Decay/Reverberation Time that gives more detail on this. (Don't ask me for details about the Schroeder Integral. That would require some real research.)

Bill

Last edited by laser188139; 02-11-10 at 03:02 PM.
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