JBL SRX818S 18" Passive Subwoofer System
Description
JBL SRX818S 18" Passive Subwoofer System
The JBL SRX818S captures and reproduces low-end frequencies with the clarity and control that separates a tight, defined mix from a muddy one. This subwoofer extends your monitoring and mixing environment into the deep sub-bass register, letting you hear exactly what's happening below 50Hz during recording and mixing sessions. The tight, controlled reproduction translates kick drum detail, bass note articulation, and synth definition with precision—critical for making mixing decisions that translate across playback systems and reveal problems before they reach final mastering.
Audio Performance
The SRX818S reaches a maximum SPL output of 135dB, providing the dynamic headroom necessary for accurate monitoring in larger control rooms and tracking spaces. Its frequency range of 45Hz–150Hz (−3dB) and 28Hz–150Hz (−10dB) with 96dB sensitivity (1W/1m) ensures extended sub-bass visibility without bloat, while the 80Hz crossover frequency integrates cleanly with full-range studio monitors and other system components for coherent, phase-aligned bass response.
Design & Build Quality
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 reliable performance through years of studio use. Four handles and compatibility with the optional JBL WK-4S caster kit enable flexible room positioning and reconfiguration, while the compact footprint of 26.89" × 26.92" × 22.62" fits efficiently into studio layouts without dominating the acoustic space.
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 studio-grade reliability with the low-end resolution that recording engineers and producers depend on to make accurate mixing and mastering decisions.
More Information
| Condition | New |
|---|---|
| Country of Manufacture | Mexico |
Reviews
At a Glance
The JBL SRX818S brings professional sub-bass extension and SPL headroom to mix rooms and tracking spaces, reaching down to 28Hz with 96dB sensitivity and seamless 80Hz crossover integration. Its tight, controlled frequency response preserves low-end definition even at high monitoring volumes, making it ideal for mixing and referencing hip-hop, electronic, and rock productions. Add one when your studio monitors need serious low-frequency anchor and your mixes require the clarity to translate sub-bass lines and kick drums accurately across all playback systems.
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.