ATI Technologies ATP 8500 Delay Setup Menu, Center, 0 ms, Right Sur, Left Sur, Exit, Speaker

Delay Setup Menu

•You can adjust the Center, Right Surround and Left Surround speaker delays by pressing the LEFT and RIGHT keys. The range of adjustment is from 0 to 5 ms (milliseconds) for the Center channel and from 0 to 15 ms for the Right Surround and Left Surround channels

•You should normally position the Left and Right Front speakers so, that they are further away from the listening position than the other speakers

•Setting the delay time on the center channel speaker helps align the sound of actor’s voices with the visual cues of their lips. For example, if the center speaker is located behind or in front of the video monitor, then the arrival of the sound will not match the movements on the screen.

Delay Setup
Center	0 ms
Right Sur.	0 ms
Left Sur.	0 ms

Exit

AN EXAMPLE OF THE DELAY SETUP MENU

You can calculate the delay times by first measuring the distance from the listening position to each speaker. At sea level, 1 foot equals approximately 1 millisecond (20 feet equals 20 milliseconds). Enter then these measurements in the table below. Place the Left and Right speakers at an equal distance from the listening position. Write the Left/Right Front speaker distance down three times, in each of the boxes in the top row.

If you get the delay settings correct, the spatial perspective of the audio will be very good to excellent. If you get these wrong (especially the center channel), then the audio perspective will be inferior. One complication . . . humans have difficulty perceiving delays shorter than about 25-30 milliseconds. You may find that exaggerating the delay time makes the audio sound better to YOUR ears; or maybe not. Once you set the delay times by measurement, you might want to experiment with the time settings.

The following example illustrates the calculation of correct delays. The Left and Right Front speakers are at 10 feet, the Center speaker is at 7 feet, the Left Surround and Right Surround speakers are at 13 feet from the listener.

AN EXAMPLE OF THE DELAY TABLE (IN FEET)

		DISTANCE TO LISTENING POSITION (FEET)
Speaker	Center		Right Surround	Left Surround
Left and Right Front	10 Feet		10 Feet	10 Feet
Center	- 7 Feet		–––––––––––––	–––––––––––––
Right Surround	–––––––––––––		–10 Feet	–––––––––––––
Left Surround	–––––––––––––		–––––––––––––	-13 Feet
(L/R Front)–(Ctr or Surr)	3 Feet		0 Feet	-3 Feet
Delay in ms	3 ms		0 ms	0 ms

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