JBL 4312M

Name: JBL 4312M
Brand: JBL

A compact 3-way bass reflex speaker system with magnetic shielding, released in 1999 as a desktop-friendly evolution of the 4312 Series.

Overview

The JBL 4312M is a 3-way speaker system introduced in 1999. It is a downsized, desktop-optimized version of JBL’s 4312 Series. It keeps the look and the acoustic approach of the larger models but fits into smaller rooms and studio setups. This is a bookshelf-type speaker with magnetic shielding, so it won't disturb CRT displays. That makes it usable in broadcast, studio, and home environments where video monitors are present. A matching wall or ceiling mount is available separately.

Specifications

Model Rating Method	3-way, 3-speaker, bass reflex system, bookshelf type, magnetic protection design
Low Frequency Driver	13.3 cm cone type
Mid Frequency Driver	5 cm cone type
High Frequency Driver	1.9 cm dome type
Frequency characteristic	60 Hz ~ 40 kHz
Output sound pressure level	89dB/2.83V/m
Impedance	4 Ω
Allowable input	75W(RMS)
Crossover frequency	5 kHz, 10 kHz
External dimensions	Width 181x Height 300x Depth 180 mm
Weight	4.0kg
Original price	¥ 64,000 (1 set of 2, released in 1999)

Design

The JBL 4312M has a newly developed 13.3 cm white cone woofer with a paper cone diaphragm and an accordion pleated surround to improve amplitude linearity. The frame is aluminum die-cast for rigidity. The midrange is a 5 cm cone driver. The tweeter uses a lipsless pure titanium dome diaphragm for clean high-frequency reproduction. Both midrange and tweeter get three independently adjustable attenuators for fine-tuning response. The enclosure is bass reflex to boost low-frequency output, and the magnetic shielding cuts interference with nearby CRT displays. Mounting options are sold separately: the Mounting Bracket MTC 520 (¥ 8,000 for 2 pcs) or the Ceiling Adapter MTC 601 (¥ 3,600 for 2 units).

Context

The JBL 4312M carries the style of the classic 4312 Series in a smaller desktop footprint, which suits near-field monitoring and compact installations. A special package, the 4312M3, was offered around 2000 as a set of three units priced at ¥ 96,000, suggesting use in multi-channel or surround configurations.