JBL SP MKII User Manual page 26

ADJUSTING THE DOLBY TIME LINK™ DIGITAL AUDIO SIGNAL DELAY SYSTEM
All Dolby Pro Logic decoders incorporate an audio signal delay to the rear speakers.
The SP MK II incorporates two high-performance, discrete-circuit channels of Dolby
Laboratories' advanced new digital audio signal delay system: Time Link.
The Dolby Pro Logic process occasionally yields erroneous leakage of front channel
sounds to the rear. TIme Link, a digital signal delay circuit, is used to reduce the per-
ceived level of leakage because of the "Hass" or precedence effect. When the front
channel information leaks into the surround speakers, we end up hearing this leakage
out of the surround speakers following the arrival (at our ears) of the front channel
information.
Time Link allows the sound coming from the front speakers to reach the viewer before
the arrival of sound from the surround speakers.
The optimum Time Link setting
depends on the distance between
the main seating area and the front
speakers, and the distance
between the main seat area and
surround speakers
Refer to the graph for choosing the
best setting in any given situation-
measure the two distances and look
to where they meet on the graph.
The shaded areas will indicate the
best setting for the delay.
If in doubt, simply set Time Link for
20 ms of delay. The setting will be
stored in the memory of the SP MK
II until you change it. You may also
use Time Link to enhance and align
arrival times of certain music sur-
round modes available in the SP
MK II. The audio signal-delay set-
tings can be stored for each applic-
able music or movie mode indepen-
dently of the Pro Logic or Home
THX Cinema modes.
PREFERRED
40
35
30
25
20
15
10
5
0
0 5 10 15
DISTANCE FROM FRONT SPEAKERS (FEET)
USABLE SPEAKER PLACEMENT RANGE WITH
XX MS DELAY TIME
21
ACCEPTABLE NOT RECOMMENDED
25 ms 20 ms
15 ms
15 ms
15 ms
15 ms
10 ms
5 ms
HAAS EFFECT
DIFFERENTIAL
ARRIVAL TIME
20 25 30 35 40