JBL 2123H Midrange Driver
The JBL 2123H is a professional 10-inch midrange driver built for high-output sound reinforcement. It is larger than the 2118H and handles more midrange output, which suits demanding professional installations and touring systems.
Specifications
| Type | 10" (250mm) Cone Midrange |
|---|---|
| Voice Coil Diameter | 2.5 inches (64mm) |
| Magnet | Ferrite |
| Nominal Impedance | 8 Ω |
| Power Handling | 150W continuous |
| Frequency Response | 150 Hz - 5 kHz |
| Sensitivity | 97 dB/W/m |
Design Features
- High Output: 10" cone area for greater midrange capacity
- Extended Bandwidth: Wide frequency range for flexible crossover design
- Professional Grade: Built for touring and permanent installation
- Sealed Chamber Design: Optimized for isolated sub-chamber operation
Applications
- Large-format 3-way and 4-way systems
- Concert sound reinforcement
- Stadium and arena installations
- High-output stage monitoring
Enclosure Design
The JBL Professional Enclosure Guide gives these recommendations for the 2123H:
Sealed Sub-Chamber Required
Models 2118, 2123, and E110 used for midrange need a small, sealed sub-chamber of approximately 0.4 cubic feet (7 liters / 0.25 cu ft) net internal volume.
Sub-Chamber Design
| Enclosure Type | Sealed sub-chamber |
|---|---|
| Required Volume | ~0.4 cubic feet (7 liters / 0.25 cu ft) |
| Construction | Non-uniform box dimensions recommended |
| Insulation | Line interior with fiberglass |
| Alternative Design | Tube enclosure with "jelly roll" fiberglass fill |
Note: With a tube enclosure, loosely fill the interior with a "jelly roll" of fiberglass and seal off the back with the baffle cutout for the mid driver.
View the complete JBL Professional Enclosure Guide →
Related Drivers
- JBL 2118H - 8" midrange alternative
- JBL E110 - 10" musical instrument midrange
- JBL 2202H - 12" mid-bass driver
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Documentation
- Lansing Heritage - Comprehensive JBL specifications, photos, and historical documents
- HiFi Engine - JBL manuals, service documents, and brochures
- Audio Karma JBL Forum - Community discussions and restoration guides