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.
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.
4671
4673
4670A
4672A
4674A
PMAX =
150 W
PMAX =
150 W
PMAX =
300 W
PMAX =
150 W
PMAX =
150 W
SENSITIVITY:
97 dB,
1 W, 1 M
SENSITIVITY:
97 dB,
1 W, 1 M
SENSITIVITY:
100 dB,
1 W, 1 M,
SENSITIVITY:
103 dB,
1 W, 1 M
SENSITIVITY:
103 dB
1 W, 1 M
EFFICIENCY:
3.5%
EFFICIENCY:
3.5%
EFFICIENCY:
7%
EFFICIENCY:
6.4%
EFFICIENCY:
6.4%
FIGURE 1. JBL SYSTEMS FOR SMALLER THEATERS
TABLE I. SYSTEMS A N D POWER
RECOMMENDATIONS
FOR SMALLER HOUSES
SEATS
VOLUME
(APPROX.)
SYSTEMS
POWER REQUIRED
FOR 100 dB
RECOMMENDED
AMPLIFIER POWER
200
1700
M3
(60,000
FT3)
4671
4673
4672A
4674A
46 WATTS
46 WATTS
23 WATTS
23 WATTS
100 WATTS
100 WATTS
50 WATTS
50 WATTS
350
2832
M3
(100,000
FT3)
4670A
4672A
4674A
30 WATTS
30 WATTS
30 WATTS
50 WATTS
50 WATTS
50 WATTS
500
4530
M3
(160,000
FT3)
4670A
4674A
50 WATTS
50 WATTS
100 WATTS
100 WATTS
ABSORPTIVE
MATERIAL
2/3
V3
SCREEN
FIGURE 2. SCREEN
MOUNTING OF
LOUDSPEAKER
