FIGURE 1C. ON-AXIS RESPONSE OF 4674A
(2TT
LOADING);
HIGH-FREQUENCY POWER RESPONSE
CORRECTED.
5. Installation
of
the systems:
FIGURE 2. MOUNTING THE SYSTEM
A. General Comments:
A. Position Behind The Screen
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.
V3
•SCREEN
B. Physical Considerations:
, ABSORPTIVE
' MATERIAL
STAND
IF
NECESSARY
MOUNTING
OF SCREEN
LOUDSPEAKER
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
Reflex Loading
dB,
Relative Response
Frequency in
Hz
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