JBL Motion Picture Loudspeaker Systems Instruction Manual page 5

The Bi-Radial horns require the model 2506
mounting bracket for proper installation. Proper
mounting is shown at bracket for proper installa-
tion. Proper mounting is shown at D. The bottom
of the mouth of the Bi-Radial horn should be flush
with the front of the LF enclosure, and the mount-
ing bracket should be securely screwed to the top
of the enclosure.
4671
PMAX = PMAX =
150 W 150 W
SENSITIVITY:
SENSITIVITY:
97 dB,
97 dB,
1 W, 1 M 1 W, 1 M
EFFICIENCY: EFFICIENCY:
3.5% 3.5%
TABLE I. SYSTEMS A N D POWER
RECOMMENDATIONS
FOR SMALLER HOUSES
VOLUME
SYSTEMS
SEATS
(APPROX.)
200 1700 M3 4671
(60,000 FT3) 4673
4672A
4674A
2832 M3 4670A
350
(100,000 4672A
FT3)
4674A
4530 M3 4670A
500
(160,000
4674A
FT3)
4673 4670A
PMAX =
300 W
SENSITIVITY:
100 dB,
1 W, 1 M,
EFFICIENCY:
7%
FIGURE 1. JBL SYSTEMS FOR SMALLER THEATERS
POWER REQUIRED
RECOMMENDED
FOR 100 dB AMPLIFIER POWER
46 WATTS
100 WATTS
46 WATTS 100 WATTS
23 WATTS
50 WATTS
23 WATTS 50 WATTS
30 WATTS 50 WATTS
30 WATTS 50 WATTS
30 WATTS 50 WATTS
50 WATTS 100 WATTS
50 WATTS
100 WATTS
Figure 12 shows how networks are mounted.
The smaller networks, models 311 OA and 3115A,
are mounted in cut-outs in the rear of the LF
enclosures, as shown at A. The high-power 3152A
is screwed onto the back of the enclosure, as
shown at B.
4672A
PMAX =
150 W
SENSITIVITY:
103 dB,
1 W, 1 M
EFFICIENCY:
6.4%
ABSORPTIVE
MATERIAL
SCREEN
2/3
V3
FIGURE 2. SCREEN
4674A
PMAX =
150 W
SENSITIVITY:
103 dB
1 W, 1 M
EFFICIENCY:
6.4%
MOUNTING OF
LOUDSPEAKER