When playing a DVD recorded with Dolby Digital audio, the distances from the listening position to the center and surround speakers should ideally be identical to those of all other speakers except for the subwoofer. The delay time setting makes it possible to compensate for the difference in distances of actual speakers by delaying the audio output from the center speaker and surround speakers so that the sounds from all speakers reach the listening position at the same timing. (The delay time adjustment is available only with Dolby Digital.)
Before starting the speaker setting, see the following figure and measure distance A of the center speaker (A = Df - Dc) and distance B for the surround speakers (B = Df - Ds). The standard delay time settings can be identified based on these values and the following tables.
Chapter 7 : Various Setups
3 Chapter 2 Chapter 1 Chapter
Ideal center speaker position
L 
R
Delay time of center speaker
Distance A | Setting Value | |
(A = Df - Dc) | ||
|
Chapter
A 
30°
C
Dc
Df
Ds
SW
Approx. 50 cm | "1.3" ms |
Approx. 100 cm | "2.6" ms |
|
|
Approx. 150 cm | "3.9" ms |
|
|
Approx. 200 cm | "5.3" ms |
¶ If distance Df is equal to or shorter than |
Dc, set to "0". |
5 Chapter 4
LS | RS | B |
|
120°
Ideal surround speaker positions
¶All speakers should be laid out within a circle as shown in the figure.
Delay time of surround speakers
Distance B | Setting Value | |
(B = Df - Ds) | ||
| ||
|
| |
Approx. 200 cm | "5.3" ms | |
|
| |
Approx. 400 cm | "10.6" ms | |
|
| |
Approx. 600 cm | "15.9" ms | |
|
|
¶If distance Df is equal to or shorter than Ds, set to "0".
8 Chapter 7 Chapter 6 Chapter
81