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Topic: Surround delay time calculation
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Harold Hallikainen
Jedi Master Film Handler
Posts: 906
From: Denver, CO, USA
Registered: Aug 2009
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posted 06-16-2011 10:46 PM
Since there has not been a whole lot of response, I'll give an opinion. Since surround speakers in a 5.1 system typically extend partway along the back wall (an L shaped array), it seems that the delay for rear wall surround speakers will be about the same as for the surround speakers. The distance from the screen speakers is not significantly different. The formula I have for surround delays (from the USL JSD-100 manual at http://www.uslinc.com/images/products/download/Jsd100Manual0111.pdf ) is:
The surround delay is set based on the length and width of the auditorium. Formulas to determine the surround delay with auditorium Length and Width in meters and feet are provided.
Surround Delay Using Meters. With Length and Width of the auditorium in meters, the surround delay, in ms, should be (L/3)‐(W/6)+20.
Surround Delay Using Feet. With Length and Width of the auditorium in feet, the surround delay, in ms, should be set to L‐(W/2)+20.
I look forward to hearing any other opinions.
Thanks!
Harold
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