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ROOM BOUNDARY LOSSES

EXPRESSED IN dB

(TYPICAL)

AIR LOSSES AT 15 METERS,

50% RELATIVE HUMIDITY

SCREEN LOSSES
(15 MIL THICK VINYL, 8% OPENING)

FIGURE

7,

RESPONSE IN THE HOUSE

FIGURE 8.

ISO STANDARD PLAYBACK RESPONSE

dB

, RELATIV

E

LEVE

L

dB

, RELATIV

E

LEVE

L

dB

, RELATIV

E

LEVE

L

SUM OF CURVES

A, B, AND C

dB

, RELATIV

E

LEVE

L

DATA FROM

FIGURE 7

«
...
8
9
10
11
12
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Содержание 4670A

Страница 1: ...uses usually found only in larger cities will have special effects low frequency channels such as Sensurround for special screenings of important films Motion Picture Loudspeaker Systems 2 General Acoustical Characteristics Historically motion picture theaters whatever their size have been acoustically dead rooms that is they have consider able absorption on the boundaries and rever beration times...

Страница 2: ...an 0 5 dB Table II shows line losses for various runs and gauges The theater dealer should always try to speci fy a stereo amplifier which can be bridged for mono operation Care must be taken that the amplifier s bridged mono rating into 8 ohms will not be exceeded C Systems for Larger Houses 1 Choosing the system Figure 3 shows the JBL systems normally specified for multi channel use in theaters ...

Страница 3: ...or using one of the many standard tilted front enclosures As a rule these are too small in volume for proper low frequency response and the client should understand this at the outset The 4671 theater system is recommended for high power surround use With an efficiency of 3 5 relatively few of these units are required They would normally be specified when the entire theater reproduction system was...

Страница 4: ...ks provide for a high frequency boost which effectively makes any of the systems power flat at high frequencies In the smaller systems this may be accompanied by a slight on axis rise at high frequencies Nevertheless we recommend that the high frequency boost be used in all theater applica tions H System Assembly 2 Details of assembly We present in Figure 9 detailed wiring dia grams of each of the...

Страница 5: ...74A 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 AND POWER RECOMMENDATIONS FOR SMALLER HOUSES SEATS VOLUME APPROX SYSTEMS POWE...

Страница 6: ... 30 48 750 FOR 8 H LOAD LINE RESISTANCE SHOULD BE 0 552 OR LESS TABLE III SYSTEMS AND POWER REQUIREMENTS FOR LARGER HOUSES SEATS VOLUME APPROX SYSTEMS POWER REQUIRED FOR 100 dB RECOMMENDED AMPLIFIER POWER PER LOUDSPEAKER 500 8500 M 3 4675 72 WATTS 150 WATTS 1000 300 000 FT3 4676A 1 63 WATTS 125 WATTS 14 160 M 3 M676A 2 42 WATTS 100 WATTS 1000 14 160 M 3 4675 90 WATTS 200 WATTS 2000 500 000 FT3 467...

Страница 7: ...TS EACH EACH EACH 1000 12 UNITS 38 UNITS 10 UNITS 2000 50 WATTS 5 WATTS 100 WATTS EACH EACH EACH FOR A MAXIMUM LEVEL OF 92 dB FOR A MAXIMUM LEVEL OF 107 dB BOTH 4401 AND 8140 SURROUND SYSTEMS SHOULD BE HIGH PASSED AT 40 Hz OR HIGHER TABLE V SUBWOOFER SELECTION DATA NUMBER OF MODULES EFFICIENCY ELECTRICAL POWER INPUT ACOUSTIC POWER SOUND LEVELS 500 1000 1000 SEATS 2000 SEATS 1 2 300 WATTS 6 WATTS 1...

Страница 8: ... FIGURE 5 POSITIONING LOUDSPEAKERS BEHIND THE SCREEN 2 3 T 1 3 i r 1 A SIDE VIEW L_J CT m i I I i B TOP VIEW FIGURE 6 SURROUND SYSTEM IMPLEMENTATION ...

Страница 9: ...FIER MAKE SURE AMPLIFIER HAS ADEQUATE POWER OUTPUT 200 MM 8 LOUDSPEAKERS USED IN MULTIPLE 70 VOLT CONFIGURATION JBL 9315HT EACH LOUDSPEAKER TAPPED AT 5 WATTS FIGURE 6 CONT D ELECTRICAL CONSIDERATIONS 8 UNITS 12 UNITS 4X2 LEFT SIDE RIGHT SIDE 5 30 LEFT SIDE RIGHT SIDE ...

Страница 10: ... 15 METERS 50 RELATIVE HUMIDITY SCREEN LOSSES 15 MIL THICK VINYL 8 OPENING FIGURE 7 RESPONSE IN THE HOUSE FIGURE 8 ISO STANDARD PLAYBACK RESPONSE dB RELATIVE LEVEL dB RELATIVE LEVEL dB RELATIVE LEVEL SUM OF CURVES A B AND C dB RELATIVE LEVEL DATA FROM FIGURE 7 ...

Страница 11: ...25H Low Frequency Transducer 1 2370 High Frequency Horn 1 2425J High Frequency Driver 1 311 OA Network 1 4560BKA Low Frequency Enclosure 1 2225H Low Frequency Transducer 1 2380 High Frequency Horn 1 2445J High Frequency Driver 1 3115A Network 1 4508 Low Frequency Enclosure 2 2225J Low Frequency Transducers 1 2360 High Frequency Horn 1 2445J High Frequency Transducer 1 2506 Mounting Bracket 1 3152A...

Страница 12: ...J Wiring Diagram for 4671 4672A 4673 4674 K Wiring Diagram for 4670A 4675A 4676A 1 FIGURE 9 CONT D 2225H ...

Страница 13: ...te Splay each HF Horn 22 1 2 off center Total Splay angle of 45 FIGURE 9 CONT D FIGURE 10 LF ENCLOSURE ASSEMBLY INSTRUCTIONS 3 1 5 2 A A MOUNTING LF TRANSCLUCERS IN 4507 4508 AND 4518 B MOUNTING LF TRANSDUCERS IN 4550BKA AND 4560BKA ...

Страница 14: ...HORN DRIVER SCREWED IN PLACE BI RADIAL HORN 4 WOOD SCREWS INTO FRONT EDGE OF LF ENCLOSURE LFENCLOSURE FIGURE 11 MOUNTING HORNS IN THEATER SYSTEMS ANGLE IRON PANEL REMOVED 2506 ADAPTER HF DRIVER ...

Страница 15: ...FIGURE 12 MOUNTING NETWORKS INCLUDED WITH NETWORK INSERT T NUTS 6 SCREWS TERMINAL BOARD PLATE REMOVED FROM INSIDE ...

Страница 16: ...JBL Incorporated RO Box 2200 8500 Balboa Boulevard Northridge California 91329 U S A ...

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