JBL S4VC - Manual (Page 8)

W HICH D IFFUSE M ODE I S THE R IGHT O NE FOR THE J OB ?
B IPOLE M ODE I S T YPICALLY U SED W HEN :
R ECOMMENDED (F ACTORY -D EFAULT ) M ODE
• The speaker is located relatively far away from the listening position.
• Multiple side or rear speakers are being used in a large listening room.
• The speaker is mounted in a corner, at a 45-degree angle.
D IPOLE M ODE I S T YPICALLY U SED W HEN :
• The speaker is located relatively close to the
listening position.
• Multiple side or rear speakers are being used in
a small listening room.
• The speaker is mounted near, but not in, a corner
and will be subject to negative reflections from
nearby walls.
• The room is highly reflective.
P REPARING THE S4Ai FOR THE
C
ORRECT
O
PERATIONAL
M
ODE
It will be necessary to choose which of the two diffuse modes to use at the time of installation. The S4Ai is shipped
from the factory in the Bipole mode. This is the recommended mode of operation. If this is your choice and the speaker
will be placed in the vertical orientation, no changes are required and the S4Ai can be directly installed into its
permanent location. Make sure the Phase switch is in the OUT position or the Bipole mode will not function properly.
Setting the phase in relation to the other speakers in the room only applies when the S4Ai speakers are set in
Dipole mode. If you choose to use the S4Ai in Dipole mode, the following information for proper phase relations
between speakers will apply:
The S4Ai speakers are shipped from the factory with the Phase switch in the OUT position. In this position, the
positive phase array is pointing toward the left as you face the speaker. That is, when positive voltage is applied to
the cone, the cone will move outward. Usually, when the Dipole mode is used in a 5.1 system, the positive phase
array should fire toward the front of the room. The array facing the rear of the room will have a negative orientation.
That is, when positive voltage is applied to the cone, it will move inward, in the opposite direction of the other array
on the speaker. As shipped from the factory, the S4Ai is set up for placement in the right-side wall in a 5.1-channel
system. The speaker that will be placed in the left-side wall should have its Phase switch pushed in so that the
positive phase array will be firing toward the front of the room when installed (see Figure 10).
8
+
-
-
+
PHASE
SWITCH PHASE
SWITCH
SWITCH OUT (SHIPPED) SWITCH IN (OPTIONAL)
Figure 9. Dipole phase relationship
S
PEAKER
P
LACEMENT
S4VC/HC/Ai OM 8/19/08 3:26 PM Page 8