S4Ai Dual -Drive Mode; Mounting The Speakers; Speaker -Mounting Options - JBL SYNTHESIS FOUR S4Ai Owner's And Installer's Manual

S P
PEAKER LACEMENT
S4Ai D -D M
UAL RIVE
As the S4Ai has the capability of producing both side and rear fields from a single location in Bipole mode while
dual-driven for cinema playback (see S4Ai Wiring Guide on page 7), some care must be taken when using the
Direct-Radiating mode with the autoswitching trigger for music playback.
Use Speaker Input #1 (see Figure 8) for the side field so that the direct-radiating tweeter for both speakers plays the
correct information generated by the decoder. This can be accomplished by rotating the "diffuse array" 180 degrees
from default so that the speakers mirror each other in the installation.
See Figure 13, which shows how to rotate the array, but note that for Dual-Drive mode you will need to rotate the
array an additional 90 degrees from the position shown for a final position, in which the tweeter-midrange array that
started out on top ends up on the bottom (and thus with the tweeter facing to the right rather than the left).
M S
OUNTING THE
S -M
PEAKER OUNTING
The S4VC, S4HC and S4Ai models all use the same mounting bracket. There are two models to choose from, based
on the type of installation. In the case of new construction,
choose the S4PCB preconstruction bracket. For retrofit instal-
lation, use the S4RFB. Both are sold separately. The speakers
will fit into standard-construction 2" x 6" walls with 16" on-
center studs. For horizontal mounting, cross-bracing is
required; also at 16" on center. See separate instructions on
mounting either S4PCB or S4RFB, included with the brackets.
The speakers are directly attached to the mounting L-brackets
with hardware supplied in the speaker packing box, and can
be adjusted for proper mounting depth with a variation of up
to 2-1/2 inches. The actual depth will vary depending on wall
construction and acoustic materials applied to the wall sur-
face (see Figure 14). To flush-mount the grille to the wall
ODE
ROTATE ARRAY CW
PEAKERS
O
PTIONS
Figure 13. Rotate top baffle for vertical or horizontal orientation
Figure 14.
10
SET THIS
SCREW TO
WALLBOARD
THICKNESS