JBL 2235H Woofer
The JBL 2235H is a 15-inch woofer built for professional monitoring. It was made to deliver clean bass under heavy demands. It sits in JBL's 4355 and other flagship systems, and it uses an SFG magnetic structure and an oversized 4-inch voice coil.
Specifications
| Type | 15" (380mm) Cone Woofer |
|---|---|
| Voice Coil Diameter | 4 inches (100mm) |
| Magnet | SFG (Symmetrical Field Geometry) Ferrite |
| Nominal Impedance | 8 Ω |
| Power Handling | 150W continuous, 300W program |
| Frequency Response | 20 Hz - 2 kHz |
| Sensitivity | 93 dB/W/m |
| Resonant Frequency (Fs) | 20 Hz |
| Equivalent Compliance (Vas) | 458 liters |
Design Features
The 2235H has a 4-inch voice coil, which handles heat well, and a high-rigidity cone tuned for stiffness and low mass. The SFG (Symmetrical Field Geometry) magnet structure is a JBL design that lowers distortion and keeps magnetic flux uniform, even at full excursion. Add the extended Xmax and a linear response, and the woofer controls the air it moves.
- SFG Magnetic Circuit: Symmetrical Field Geometry design reduces distortion and improves power handling compared to traditional magnet structures
- Large Voice Coil: 4-inch diameter voice coil provides excellent heat dissipation and power handling
- High-Rigidity Cone: Proprietary cone material with optimal mass/stiffness ratio
- Extended Xmax: Long excursion capability for deep bass extension
- Low Distortion: Exceptionally linear frequency response and low harmonic distortion
Applications
The 2235H was built for control rooms, not living rooms. It anchors some of JBL's best-known professional monitors, where accuracy and endurance are required.
- JBL 4355 - Dual 2235H woofers in flagship studio monitor
- JBL 4345 - Predecessor to 4355
- JBL 4350 - Large format studio monitor
- Custom high-end installations
In the Wild
Resistor Magazine covered the 2235H in its restoration feature on Iwan Arjanto's vintage JBL builds. Arjanto hand-assembled 4355s for clients in Indonesia's humid climate, and they rely on these drivers year after year. The switch from Alnico to ferrite kept the clarity and added reliability and power handling.
Relationship to 2234H
The 2235H evolved directly from the 2234H. It keeps the same SFG foundation and the same 15-inch size, with refinements that cut distortion further and raise power handling for demanding studio use.
Thiele-Small Parameters
| Parameter | Value |
|---|---|
| Fs (Resonant Frequency) | 20 Hz |
| Vas (Equivalent Compliance) | 458 liters |
| Qts (Total Q) | ~0.25 |
| Xmax (Maximum Excursion) | ~8mm |
Enclosure Design
JBL's own Professional Enclosure Guide lays out the recommended enclosures for the 2235H, which it treats as a high-performance low-end driver or standalone subwoofer:
| Application | Hi-fi low-end or subwoofer |
|---|---|
| Chart Reference | #9 |
| Enclosure Volume | 6.0 cubic feet (170 liters) |
| Tuned Frequency | 40 Hz |
| Internal Dimensions | 27.0" H x 22.0" W x 19.1" D |
| Vent Area | 50.3 sq in (4x 4" ducts) |
| Duct Length | 8.2 inches |
The JBL 4355 goes bigger. It uses dual 2235H drivers in a 10 cubic foot enclosure tuned to 30 Hz (Chart #11).
View the complete JBL Professional Enclosure Guide →
Related Drivers
- JBL 2234H - Similar design, slightly different parameters
- JBL 136A - Predecessor used in earlier L-series speakers
- JBL 2202H - 12" mid-bass companion driver used in same systems
Market Value
┌──────────────────────────────────────────────────────────────────────────┐ │ JBL 2235H WOOFER Nov 2026 │ ├──────────────────────────────────────────────────────────────────────────┤ │ High $2,234 Latest $1,200 │ │ Median $1,200 Trend — │ │ Low $1,076 Volume ~1/mo │ ├──────────────────────────────────────────────────────────────────────────┤ │ $3,000 ┤ │ │ │ │ │ │ │ │ $2,143 ┤ . │ │ │ │ │ │ │ │ │ │ │ $1,000 ┤. .│ │ ├─────────────────────────────────────────────────────────────────│ │ vol │█ █ █│ │ └─────────────────────────────────────────────────────────────────│ │ 2026-02 2026-04 2026-06│ └──────────────────────────────────────────────────────────────────────────┘
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eBay Listings
Recently sold on eBay: $1,076–$2,234 (median $1,200, based on 3 completed sales, past 12 months)
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