The JBL 4312G is a modern take on the iconic 12-inch, 3-way monitor lineage that began in 1968. Built for serious listening rooms, it combines a pure-pulp 12" woofer, a 5" polymer-coated midrange, and a 1" magnesium/aluminum alloy dome tweeter with a waveguide. Front-ported bass reflex design, mirror-imaged pairs, and user-adjustable MF/HF attenuators deliver the classic JBL studio sound with real placement flexibility at home.
| Design | 3-way, bass-reflex (front-firing port) |
| Low-Frequency Driver | 12" (300 mm) pure-pulp cone woofer |
| Mid-Frequency Driver | 5" (125 mm) polymer-coated pure-pulp cone (JM125PC-8) |
| High-Frequency Driver | 1" (25 mm) magnesium/aluminum alloy dome tweeter with waveguide (054ALMg-1) |
| Crossover Frequencies | 640 Hz, 5 kHz |
| Frequency Response | 44 Hz – 40 kHz (-6 dB) |
| Sensitivity | 90 dB (2.83 V/1 m) |
| Nominal Impedance | 6 Ω |
| Recommended Amplifier Power | 10 – 200 W RMS |
| User Controls | HF and MF level attenuators |
| Inputs | Five-way binding posts |
| Finish / Grille | Black woodgrain cabinet / black grille |
| Dimensions (H × W × D) | 597 × 362 × 305 mm (23.5" × 14.25" × 12") |
| Weight | 23.8 kg (52.4 lb) each |
| Recommended Stands | JBL JS-120 (sold separately) |