JBL SRX818S 18" Passive Subwoofer System
Description
JBL SRX818S 18" Passive Subwoofer System
The JBL SRX818S locks the low-end pocket with earth-shaking bass response that gives every performance a physical presence audiences feel in their chests. This subwoofer commands the foundation in any performance space, translating every nuance of your low frequencies with clarity and control that keeps the rhythm section tight and defined even at high volumes. The tight, controlled reproduction makes this system equally capable anchoring live rock, reinforcing hip-hop and electronic beats, or extending full-range PA systems where serious bottom-end extension is non-negotiable.
Audio Performance
The SRX818S reaches a maximum SPL output of 135dB, delivering the headroom needed for large venues and high-energy applications. Its frequency range of 45Hz–150Hz (−3dB) and 28Hz–150Hz (−10dB) with 96dB sensitivity (1W/1m) ensures deep sub-bass extension without sacrificing definition, while the 80Hz crossover frequency integrates seamlessly with full-range speakers and other system components.
Build & Reliability
Built from 18mm plywood with a durable Obsidian Duraflex™ finish, the SRX818S features a heavy-duty 14-gauge perforated steel grille backed by acoustically transparent black cloth, ensuring rugged reliability through endless touring and permanent installation environments. Four handles and compatibility with the optional JBL WK-4S caster kit make transport and positioning manageable night after night, while the compact footprint of 26.89" × 26.92" × 22.62" fits efficiently into venue layouts without sacrificing performance.
Key Features
- Maximum SPL Output: 135dB
- Frequency Range (−10dB): 28Hz–150Hz
- Frequency Response (−3dB): 45Hz–150Hz
- Sensitivity (1W/1m): 96dB
- Power Rating: 2400W Peak, 1200W Program, 600W Continuous
- Nominal Impedance: 8 Ohm
- LF Driver: 2279H
- Crossover Frequency: 80Hz
- Connectors: NL4 Input and NL4 Loop-thru with +/−1 or +/−2 Selectable Configuration
- Enclosure Material: 18mm Plywood with Obsidian Duraflex™ Finish
- Grille: Powder-coated 14-gauge Perforated Steel with Acoustically Transparent Black Cloth Backing
- M20 Threaded Pole Mount with Four Handles and JBL WK-4S Caster Kit Compatibility
The SRX818S combines professional-grade reliability with the punch and precision that gigging musicians and system engineers depend on night after night.
More Information
| Condition | New |
|---|---|
| Country of Manufacture | Mexico |
Reviews
At a Glance
The JBL SRX818S is an 18-inch passive subwoofer that delivers 135dB SPL output with tight, controlled low-end extension from 28Hz, locking in the pocket for live rock, hip-hop, and electronic music at any scale. Built from rugged 18mm plywood with a steel grille and four handles, it moves between venues and sits reliably night after night without losing definition or punch. Choose it when you need earth-shaking bass that your rhythm section can lock into and audiences can feel—from mid-size clubs to festival stages.
Who This Is For
Great for
- ✓ Live Performance
- ✓ Electronic Music
- ✓ Hip-Hop
- ✓ Rock
- ✓ Touring
Not the best pick for
- – Acoustic Folk
- – Classical Music
- – Intimate Venues
Frequently Asked Questions
What size venues and applications is the SRX818S built for?
The SRX818S reaches 135dB maximum SPL and integrates into everything from mid-size live performances to large-venue PA systems and permanent installations. Its 80Hz crossover frequency integrates seamlessly with full-range speakers, and the 28Hz–150Hz frequency range (−10dB) extends serious bottom end without losing definition at high volumes.
How does this subwoofer handle transport and setup?
Four handles and an M20 threaded pole-mount system make moving and positioning practical, while compatibility with the optional JBL WK-4S caster kit adds mobility for touring. The compact 26.89" × 26.92" × 22.62" footprint fits efficiently into venue layouts without sacrificing performance.
What's the difference between the frequency ranges listed (45Hz and 28Hz)?
The SRX818S reaches 45Hz at −3dB (the industry standard response measurement) and extends to 28Hz at −10dB, providing deeper sub-bass extension for venues and systems that demand the lowest frequencies. The 96dB sensitivity (1W/1m) ensures that extension stays tight and defined even at high SPL.
Can I use the SRX818S with other speakers and subwoofers?
Yes—the 80Hz crossover frequency and selectable +/−1 or +/−2 configuration on the NL4 input and loop-thru connectors allow seamless integration with full-range PA speakers and other system components. The passive design (2400W peak, 1200W program power handling) requires a powered mixer or amplifier.
What materials make this subwoofer road-reliable?
The SRX818S uses 18mm plywood with Obsidian Duraflex™ finish and a heavy-duty 14-gauge perforated steel grille backed by acoustically transparent cloth, designed to withstand touring and permanent installation environments without degradation.
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