JBL D123-3
The D123-3 is a 12-inch full-range driver from JBL, part of the D123 family. It was the higher-power version of the standard D123, rated at 50 watts versus the D123's 25, with a heavier voice coil to handle the extra load. Past that, the documentary record gets thin and sometimes contradicts itself.
Sources agree on a few things. The driver is 12 inches (305 mm) across, covers 45-16,000 Hz, and presents a 16-ohm impedance. JBL's own advertising from the period put it alongside the flagship D130. That advertising called the D123 "versatile" with a 3-inch voice coil, part of a line built with edge-wound aluminum ribbon voice coils, rigid cast frames, and dural center domes attached directly to the voice coil for clean, resonance-free sound. The claims ran in Audio (1958, p.29).
The D123-3 found real use in guitar amplification. It went into some Fender amps, and owners still praise it for vintage tube guitar rigs. Enthusiasts also report good results with it as a midbass driver in home systems, and one common observation is that it sounds musical in open baffles but gets thin in small cabinets. It appears in a long list of JBL cabinet systems (C37, C38, S7-S11, D53-D58, and others), though that list may be shared across D123 variants.
Here the record conflicts. Magnet material is cited as both Alnico 5 and ceramic. Weight is given as either 8.8 lb or 12.4 lb. Voice coil diameter is given as 1.5" or 2". These differences likely reflect early versus late production runs, but no source states that explicitly. No production years, original price, or Thiele/Small parameters have surfaced.
Known specs:
- 12" (305 mm) full-range driver
- Frequency range: 45–16,000 Hz
- Impedance: 16 ohms
- Power handling: 50 watts (higher-power version of the 25-watt D123)
- Efficiency: 95–96 dB (1W/1m, source-dependent)
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