JBL D123 (1955)
A 12-inch full-range cone driver built for high efficiency and wide dispersion, released by JBL in 1955.
Overview
The JBL D123 is a 30 cm (12-inch) full-range cone speaker unit designed and manufactured by JBL, introduced in 1955. It was engineered as an extended-range speaker solution with strong output and broad coverage, suitable for both public address and high-fidelity applications. Unlike multi-way systems, the D123 operates as a single full-range driver, simplifying integration into enclosures while maintaining a wide directional pattern of 90 degrees. It carries a nominal impedance of 8 Ω and delivers a sound pressure level of 98 dB at 1 kHz (measured under new JIS standards), making it highly efficient for its era. With a continuous program power handling of 50 watts, it was built to handle demanding audio loads reliably.
Specifications
| Size | 12 inch (300 mm) / 30 cm |
| Allowable input | 50W (continuous program) |
| Impedance | 8 Ω |
| Directional | 90 ° |
| Sound pressure level (new JIS) | 98dB(1kHz) |
| Voice Coil Diameter | 7.6cm |
| Magnet Assembly Weight | 3.1kg |
| Magnetic flux density | 10,400gauss |
| Recommended enclosure volume | 56L ~ 141L |
| Depth | 102mm |
Market
The JBL D123 was priced at ¥40,100 per unit around 1974, reflecting its value in the Japanese market nearly two decades after its 1955 release. This pricing indicates sustained demand and production longevity, positioning it as a trusted workhorse in professional and high-end audio setups.
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