JBL Northridge Series User Manual

09/02
Technical Manual
ND310II
Northridge
™
Series
ACOUSTIC & ELECTRICAL SPECIFICATIONS:
• Nominal Impedance 8 ohms
• Max Amp Power 250 watts*
•Frequency Response 37Hz – 20kHz
• Sensitivity 91dB (1 watt @ 1 meter)
•Crossover Frequencies 1000Hz, 5000Hz
SYSTEM COMPONENTS:
• Enclosure ND310II (not for sale)
•Grille 337804-001
• Low-Frequency 10" (254mm) Polyplas
™
, shielded
Transducer (2) 335573-002
DC Resistance 10.8 ohms ±10%
• Mid-Frequency Transducer 4" (102) Polyplas
™
, shielded
335588-002
DC Resistance 4.4 ohms ±10%
• High-Frequency
3/4" (19mm) titanium-laminate
Transducer dome, shielded 338035-001
DC Resistance 3.0 ohms ±10%
•Crossover Network 335624-002
AURAL SWEEP TEST SPECIFICATIONS:
• System Aural Sweep Test 6.0V Input 30Hz to 20kHz
• L.F. Aural Sweep Test 6.0V Input 30Hz to 2kHz
• M.F. Aural Sweep Test 4.0V Input 500Hz to 6kHz
• H.F. Aural Sweep Test 2.83V Input 4kHz to 20kHz
PHYSICAL SPECIFICATIONS:
• Enclosure Dimensions 42" x 14-1/2" x 12"
(H x W x D) 1067mm x 368mm x 305mm
•Weight 55 lb/25kg (each)
WARRANTY:
• Refer to Warranty Statement packed with each product.
* The maximum recommended amplifier power rating will
ensure proper system headroom to allow for occasional
peaks. We do not recommend sustained operation at
these maximum power levels.
Owner’s Manual
338061-001
Warranty Card
338322-001
Survey Card
331384-001
OWNER’S
MANUAL
Outer Carton
337798-001
Plastic Bag (2 pcs.)
Upper/Lower
Foam
337799-001
PACKAGING
JBL Consumer Products, 250 Crossways Park Dr., Woodbury, New York 11797
ND310II Northridge
™
Series
— +
— +
Driver Low
Frequency
335573-002
Driver Mid
Frequency
335588-002
Network
335624-002
GREEN/BLACK
GREEN/BLACK
— +
GREEN
GREEN
YELLOW
YELLOW/BLACK
WHITE/BLACK
WHITE
+
—
Driver High
Frequency
338035-001
+—
L.F.
M.F.
+IN
–IN
I
NPUT
+
+
H.F.
250
250
–
+
110
250
+
–
205
110
–
205
–
205
L1
2.8mH
L3
300µH
L2
640µH
C1
15µF, 100v
R1
7.5/10W
C2
4µF, 100v
RED
BLACK
GREEN 21"
GREEN 16"
GREEN/BLACK 16"
WHITE/BLACK 34"
WHITE 34"
YELLOW 36"
YELLOW/BLACK 36"
GREEN/BLACK 21"
ND310II SCHEMATIC
WIRING DIAGRAM

JBL Northridge Series Specifications

General

Series	Northridge
Type	Bookshelf, Floorstanding, Center Channel
Impedance	8 Ohms
Dimensions	Varies by model
Weight	Varies by model
Frequency Response	45Hz - 20kHz (varies by model)

Summary

Acoustic and Electrical Specifications

Nominal Impedance

The electrical resistance of the speaker system when operating.

Max Amp Power

The maximum recommended amplifier power rating for the system.

Frequency Response

The range of audio frequencies the speaker can reproduce.

Sensitivity

The sound pressure level produced by the speaker at a given distance and power input.

Crossover Frequencies

The frequencies at which the audio signal is divided among different speaker drivers.

System Components and Specifications

Enclosure

Details about the speaker cabinet, including model number.

Grille

Information regarding the speaker grille component.

Low-Frequency Transducer

Specifications for the primary bass driver, including DC resistance.

Mid-Frequency Transducer

Specifications for the midrange driver, including DC resistance.

High-Frequency Transducer

Specifications for the tweeter driver, including DC resistance.

Crossover Network

Part number for the internal crossover component.

Wiring Diagram and Schematic

Wiring Diagram

Visual representation of how drivers connect to the crossover network.

Schematic

Detailed circuit diagram of the speaker's internal wiring and components.

Exploded View

Enclosure and Grille

Diagram showing the main cabinet and protective grille.

Speaker Drivers

Illustration of the woofer, midrange, and tweeter components.

Internal Components

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

Fasteners and Accessories

Details on screws, feet, and bump-on pads used for assembly.