Installation Of The Systems; General Comments; Physical Considerations; Position Behind The Screen - JBL 4671 Instruction Manual

FIGURE 1C. ON-AXIS RESPONSE OF 4674A (2TT LOADING);
HIGH-FREQUENCY POWER RESPONSE
CORRECTED.
Reflex Loading

5. Installation of the systems:

A. General Comments:
JBL's theater systems are shipped to the dealer in
component form. Every attempt is made to ship the
components complete so that the systems can be readily
assembled. All components should be inspected prior to
being sent out to the job site. Wiring instructions for all
theater systems are included in the dividing network
package.
Many dealers will want to take advantage of the fact
that certain JBL theater low-frequency systems are
available loaded from the factory. These are:
4647 (consisting of 4507 loaded with 2225H)
4648 (consisting of 4508 loaded with 2-
2225H)
Further, the 4671 OK is a factory preassembled ver-
sion of the utility system with an oak vinyl enclosure and
brown grille cloth.
B. Physical Considerations:
Mounting the system behind the screen is shown in
Figure 2A. The preferred location is two-thirds the dis-
tance up the screen, and this may require a platform.
Details of this are shown at B.
4
LF
Horn Loading
LF
Frequency in Hz
FIGURE 2. MOUNTING THE SYSTEM
A. Position Behind The Screen
V3
•SCREEN
, A B S O R P T I V E
' M A T E R I A L
S T A N D
IF
NECESSARY
MOUNTING
OF SCREEN
LOUDSPEAKER