JBL Studio S312II User Manual

Technical Manual
S312II
Studio
™
Series
ACOUSTIC & ELECTRICAL SPECIFICATIONS:
• Nominal Impedance 8 ohms
• Max Amp Power 250 watts
•Frequency Response 35Hz – 20kHz
• Sensitivity 92dB (1 watt @ 1 meter)
•Crossover Frequencies 750Hz, 3000Hz
SYSTEM COMPONENTS:
• Enclosure S312II (not for sale)
•Grille 338778-001
• Low-Frequency Transducer 12" (305mm) PolyPlas,
™
shielded
(335151-002)
DC Resistance 5.6 ohms ±10%
• Mid-Frequency Transducer 4" (101mm) PolyPlas,
™
shielded
(338040-001)
DC Resistance 4.3 ohms ±10%
• High-Frequency Transducer 1" (25mm) titanium dome,
shielded (338042-001)
DC Resistance 3.4 ohms ±10%
•Crossover Network 335412-002
AURAL SWEEP TEST SPECIFICATIONS:
• A. System Aural Sweep Test 6.0V Input 30Hz to 20kHz
• B. L.F. Aural Sweep Test 6.0V Input 30Hz to 1kHz
• C. M.F. Aural Sweep Test 4.0V Input 500Hz to 4kHz
• D. H.F. Aural Sweep Test 2.83V Input 3kHz to 20kHz
PHYSICAL SPECIFICATIONS:
• Enclosure dimensions: 41" x 14-3/4" x 12-1/4"
(H x W x D) 1041mm x 375mm x 311mm
•Weight 77 lb/35kg each
WARRANTY:
• Refer to Warranty Statement packed with each product.
Owner’s Manual
338018-001
Warranty Card
338322-001
Survey Card
331384-001
Spike Foot Kit
338076-001
OWNER’S
MANUAL
Upper/Lower
Foam
337754-001
Microfoam
(2 pcs.)
Outer Carton
338056-001
PACKAGING
07/02
JBL Consumer Products, 250 Crossways Park Dr., Woodbury, New York 11797
S312II Studio
™
Series
Driver
High-Frequency
338042-001
Driver
Mid-Frequency
338040-001
Driver
Low-Frequency
335151-002
YELLOW/BLACK
WHITE/BLACK
GREEN/BLACK
WHITE
GREEN
YELLOW
Crossover Network
335412-002
+IN
–IN
INPUT
GREEN
BLK/GREEN
WHT/BLACK
WHITE
YELLOW
YEL/BLK
RED
BLACK
L.F.
M.F.
+
H.F.
250
+
+
205
205
–
110
–
205
–
110
L4
4.4mH
R6
5.1 ohms
10W
C7
40µF
100V
C2
0.01µF
250V
R3
40 ohms
5W
R7
2.4 ohms
10W
R8
2.4 ohms
10W
L2
400µH
C3
20µF/100V
C4
0.01µF/250V
C8
9µF/100V
R5
10 ohms
5W
L3
220µH
C6
0.01µF/250V
S312II SCHEMATIC
WIRING DIAGRAM

JBL Studio S312II Specifications

General

Sensitivity	91dB
Impedance	8 Ohms
Woofer Size	12 inches
Drivers	3-way
Woofer	12" PolyPlas
Midrange	4" PolyPlas
Tweeter	1" Pure Titanium

Summary

Acoustic and Electrical Specifications

Nominal Impedance

Specifies the nominal electrical impedance of the speaker system.

Max Amp Power

Indicates the maximum continuous power handling capability of the speaker.

Frequency Response

Defines the range of audio frequencies the speaker can reproduce effectively.

Sensitivity

Measures the speaker's efficiency in converting power to sound pressure level.

Crossover Frequencies

Lists the frequencies at which the speaker's internal crossover network divides the audio signal.

System Components and Specifications

Enclosure

Details about the speaker's cabinet, including part number and sale status.

Low-Frequency Transducer

Specifications for the main woofer, including size, material, and DC resistance.

Mid-Frequency Transducer

Specifications for the midrange driver, including size, material, and DC resistance.

High-Frequency Transducer

Specifications for the tweeter, including dome material, and DC resistance.

Crossover Network

Part number for the speaker's internal crossover network.

Wiring Diagram and Schematic

S312 Schematic

Detailed circuit diagram showing the connections of drivers and crossover components.

Packaging Components

Packaging Parts

Lists components included in the speaker packaging, such as foam and outer carton.

Included Manuals and Kits

Details the various manuals and accessory kits provided with the product.

Exploded View of Speaker

Enclosure and Grille

Diagram showing the main cabinet and protective grille with part numbers.

Driver Assembly

Exploded view of the woofer, midrange, and tweeter drivers and their mounting hardware.

Internal Components

Illustration of the crossover network, terminal cup, and port tube.

Faceplate and Fasteners

Details the faceplate, gasket, and various screws used for assembly.