JBL 4312BMkII User Manual

12 Inch 3-Way Studio Monitor
Model 4312BMkII
4312MkIIWX
Owner's Manual
The 4312BMlII and 4312MkIIWX are new members of the classic 4312 family of bookshelf studio monitors. This
line dates back to 1968 with the original 4310. The B and WX differ from each other in finish. The WX is
traditional oiled walnut whereas the B is black tolex vinyl.
MID FREQUENCY LEVEL
JBL Incorporated, Northridge, California, USA
MODEL 4312B MKII CONTROL MONITOR
HIGH FREQUENCY LEVEL
JBL Incorporated

JBL 4312BMkII Specifications

General

Sensitivity	93dB (2.83V/1m)
Woofer	12-inch (300 mm)
Midrange	5-inch (125mm) polymer-coated pulp cone midrange (105H-1)
Tweeter	1-inch (25mm) magnesium/aluminum alloy dome tweeter (054ALMg-1)
Nominal Impedance	8 ohms

Summary

Introduction to JBL Studio Monitor 4312

Unpacking and Initial Checks

Speaker Installation and Placement

Optimizing Stereo Imaging

Set speaker distance and angle (40-60 degrees) for a precise center image. Align HF units at ear-level.

Base Placement Recommendations

Use sturdy bases (5-20 cm) to avoid floor surface interference and position speakers at ear-level.

Amplifier Connection Guidelines

Polarity and Terminal Connections

Connect with amplifier power OFF. Observe terminal polarity (red/black). Use Y terminals or banana plugs.

Attenuator Adjustment for Sound Levels

Grill Attachment and Maintenance

Speaker Care and Longevity

Cleaning Procedures

Use dry cloth for cabinets, soft brush for speaker units. Avoid liquids, direct sunlight, and high temperatures.

Durability and Environmental Factors

Woofer stress is normal. Lifespan affected by temp, humidity, UV. Avoid strong light and heat sources.

Technical Specifications Overview