JBL 4312MKII WX/GY (1996 onwards)
The 4312MKII is the improved version of JBL's 4312 Control Monitor, introduced around 1996. It's a 3-way, 3-driver bass reflex bookshelf system that continued the lineage of the 4310, one of the "legendary studio monitors" of the 1960s. It was sold in two finishes: the WX with a blue baffle and walnut veneer, and the GY with gray paint. Japanese pricing at launch was ¥95,000 for the WX and ¥105,000 for the GY per unit. By around 2000 that had risen to ¥105,000 and ¥115,000 respectively.
The low end is a 30 cm white-cone woofer (2213H) with a 75 mm copper ribbon edgewise-wound voice coil. It runs on a symmetrical field geometry (SFG) magnetic circuit for low distortion and sits in an aluminum die-cast frame. The midrange is a 12.5 cm cone (104H-3). The highs come from a 2.5 cm hard dome tweeter (052Ti) with a lipless pure titanium diaphragm. That was a change from earlier 4312 versions and improved high-frequency response and transient behavior. Independent attenuators adjust the mid and high output levels. The fixed edge means no foam surround rot to worry about.
Rated frequency response is 45 Hz to 22 kHz (-6 dB). Output sound pressure level is 93 dB/2.83V/m, impedance is 6 Ω, and allowable input is 100 W RMS. Crossovers are at 2 kHz and 5 kHz. Dimensions are 362 × 597 × 298 mm (W×H×D), and each speaker weighs 20 kg.
No period reviews or owner opinions specific to this model surfaced in the research, so the record on how it sounded in practice is thin. What's documented is the engineering.
- 3-way, 3-speaker bass reflex bookshelf system
- 30 cm woofer (2213H), 12.5 cm midrange (104H-3), 2.5 cm dome tweeter (052Ti)
- Frequency response: 45 Hz – 22 kHz (−6 dB)
- Impedance: 6 Ω · 100 W RMS allowable input
- Crossovers at 2 kHz and 5 kHz
- 362 × 597 × 298 mm, 20 kg
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