JBL 4312MII (2008)
The 4312MII is a compact three-way studio monitor that JBL sold in Japan beginning in March 2008. It replaced the earlier 4312M. It's the classic JBL studio-monitor recipe shrunk down to bookshelf size: white pure-pulp woofer, pure-pulp cone midrange, titanium-dome tweeter. The low end comes from a 13.3 cm (5.25-inch) cone woofer in an aluminum die-cast frame. The midrange is a 5 cm (2-inch) pure-pulp cone. The highs come from a 1.9 cm hard-domed tweeter with a nitrogen-quenched titanium diaphragm, which extends response to 50 kHz.
JBL's own spec sheet calls it a "5.25-inch, 3-way high-performance Studio Monitor" and leans hard on the heritage angle, claiming it "truly embodies JBL's 70-year legacy of world-class audio." The engineering details are more concrete. The crossover is first-order (-6 dB/oct.). A 3-point attenuator switch adjusts mid and high output levels. The bass-reflex enclosure was revised for this model with a wider duct and increased cabinet volume. Internal bracing was added to stiffen the box and cut down unwanted resonance. The magnetic protection design means it can sit near a TV without worry.
Measured performance from audio-database.com puts the frequency characteristic at 55 Hz to 50 kHz, output sound pressure level at 90 dB/2.83V/m, impedance at 6 ohms, and allowable input at 75W (music). Crossover points are 7 kHz and 12 kHz. Dimensions are 181 × 300 × 180 mm (W×H×D), and each speaker weighs just 4.0 kg. Two finishes were offered: walnut (WX) and black (BK), priced at ¥76,000 and ¥66,000 per pair respectively at launch. Wall and ceiling mounting brackets were available separately.
Documentation on this model is decent on specs but thin on history. Production years beyond the March 2008 sale date aren't recorded in the available sources, and there's no official word on where it sat in JBL's broader lineup. It is a direct descendant of the 4312M, and it found an audience with listeners who wanted the JBL monitor sound in a small room. One owner on a Hong Kong forum compared it favorably against ProAc D1, JMlab 806s, and PMC DB1+ for strong bass. Spinorama.org, which measures speakers and posts the data, rated the quality of its measurement data as high.
- Type: 3-way, 3-speaker, bass reflex, bookshelf, magnetic shielding
- Woofer: 13.3 cm (5.25″) cone, pure pulp, aluminum die-cast frame
- Midrange: 5 cm (2″) cone, pure pulp
- Tweeter: 1.9 cm hard dome, tempered titanium diaphragm
- Frequency response: 55 Hz – 50 kHz
- Sensitivity: 90 dB / 2.83V / m
- Impedance: 6 ohms
- Power handling: 75W (music)
- Crossover: 7 kHz, 12 kHz
- Dimensions: 181 × 300 × 180 mm (W×H×D)
- Weight: 4.0 kg per speaker
- Finishes: Walnut (WX), Black (BK)
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