JBL 2118H Midrange Driver
The JBL 2118H is an 8-inch midrange driver built for high-output live reinforcement. It's compact, rugged and very efficient, and it handles the midrange with authority in multi-way systems.
Specifications
| Type | 8" (200mm) Cone Midrange |
|---|---|
| Voice Coil Diameter | 2 inches (50mm) |
| Magnet | Ferrite |
| Nominal Impedance | 8 Ω |
| Power Handling | 100W continuous |
| Frequency Response | 200 Hz - 6 kHz |
| Sensitivity | 96 dB/W/m |
Design Features
- High Sensitivity: 96 dB efficiency cuts through dense mixes without straining amplifiers
- Extended Range: Covers a wide midband, reducing the need for complex crossover networks
- Sealed Chamber Operation: Engineered for tight, controlled response in isolated sub-chambers
- Professional Construction: Built to endure the rigors of constant high-SPL operation
Applications
- 3-way and 4-way sound reinforcement systems
- Large venue installations
- Stage monitoring
- High-output midrange reinforcement
Enclosure Design
JBL's own enclosure guide is clear on this. The 2118H doesn't go into just any box, and it needs a tuned enclosure to deliver its full output.
Sealed Sub-Chamber Required
Models 2118, 2123, and E110 used for midrange require 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 |
For a tube design, loosely pack the interior with a "jelly roll" of fiberglass, then seal the driver's back cavity using the baffle cutout. Include the sub-chamber's external volume when calculating the total box displacement.
View the complete JBL Professional Enclosure Guide →
Related Drivers
- JBL 2123H - 10" midrange alternative
- JBL E110 - 10" musical instrument midrange
- JBL LE5 Series - Hi-fi midrange drivers
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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- Lansing Heritage - Comprehensive JBL specifications, photos, and historical documents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