Dolby Laboratories Multichannel Audio Tool DP570 - Manual (Page 79)

Setting Delay Values
Dolby ® DP570 Multichannel Audio Tool User’s Manual 63
3. Click Enabled to turn Panorama on. It is disabled by default.
A.2 Setting Delay Values
For optimal performance, signals from all the speakers should arrive at the reference
listening position simultaneously. This is accomplished by assigning delays to each
speaker.
Measure and record the distance from the reference listening position to each of the
following speakers. No measurement is necessary for Back Surround speakers, as this
value is automatically calculated as a function of Dolby Surround EX™.
• Left speaker (L) and Right speaker (R)
• Center speaker (C)
• Left Surround speaker (Ls)
• Right Surround speaker (Rs)
In the calculations that follow:
• L equals the distance from the Left speaker to the reference listening position
• R equals the distance from the Right speaker to the reference listening position
• C equals the distance from the Center speaker to the reference listening position
• S equals the shorter of the distances from Ls or Rs to the reference listening position
A.2.1 Calculating Delay Values
Center Delay
L minus C (L – C) equals the Center delay setting in milliseconds.
For example, if C is 2 feet fewer than L or R, set Center delay to 2 ms. If C is 3 feet more
than L or R, set Center delay to –3 ms. If C = L = R, set Center delay to 0 ms.
Note: The L and R speakers should be equidistant from the reference listening position.
Reposition them if necessary.
Note: The calculations below assume you are measuring in feet and inches. If you are
measuring in metric units, triple the distance measured.
Note: If you set a negative Center delay value, the DP570 actually sets Center delay to
0 ms and adds corresponding positive delay time to the Left, Right, and surround
outputs.