FBT X SUB 118SA Active 18-inch DSP Subwoofer for DJs

FBT X SUB 118SA: Processed Low-End Power for X LITE and X PRO Rigs

Built to extend a full-range system the right way: The FBT X SUB 118SA is a processed active subwoofer engineered to add authoritative low-frequency support to portable PA systems and installed sound—especially as a system partner for the FBT X LITE and X PRO series.

18-inch driver + Class D amplification: A high-output 18" LF woofer with a 3" voice coil is driven by a 1200W Class D power amplifier, delivering tight, venue-filling bass with a frequency response rated at 38 Hz to 120 Hz (-6 dB).

DSP-assisted integration and routing: Four DSP presets (two responses with two different cut-off options) help you match the sub to different top configurations. The control panel supports stereo combo XLR/jack in-outs, stereo XLR HP filter outputs, level control, preset selection, and a 0°/180° phase reversal switch with protection/limit status LEDs.

Road-ready woodwork and deployment hardware: The cabinet is built from 18 mm (0.70") birch plywood with scratch-resistant black paint, includes an M20 top-mounted stand adapter, two FBT design aluminum handles, and support for optional 100 mm transport wheels.

Real-World Applications and Sound Roles:

• Low-frequency foundation for mobile DJ rigs that need clean punch without muddy overhang
• Sub support for clubs, live events, touring, and installed sound where compact footprint still must move air
• System extension for X LITE / X PRO tops using DSP preset matching and HP filter routing

Where the FBT X SUB 118SA Excels

• Serious Output in a Deployable Format: Up to 136 dB half-space performance targets real event SPL needs without requiring oversized inventory.
• Low-End Reach that Reads on a Dance Floor: 38 Hz to 120 Hz (-6 dB) coverage supports modern DJ playback and live kick fundamentals.
• DSP Preset Flexibility: Four presets (two responses with two cut-off options) make it easier to dial-in crossover behavior around different top choices.
• Cleaner System Routing: Stereo combo XLR/jack in-outs plus stereo XLR HP filter outputs help you keep signal flow organized and repeatable.
• Phase Correction at the Source: 0°/180° phase reversal supports quick alignment when placement forces polarity/phase issues.
• Touring-Friendly Cabinet Build: 18 mm birch plywood with scratch-resistant black paint is built for transport cycles and venue turns.
• Practical Deployment Hardware: M20 top mount socket supports pole-mounting tops for clean, compact stacks.
• Optional Mobility Upgrade: Optional 100 mm transport wheels support faster load-ins for crews moving subs across ballrooms and stages.
• Built for Chicago DJs: Tuned for the real-world needs of city load-ins—fast setup, clean routing, and bass you can feel in clubs and event rooms.

Control Modes and Rear-Panel Workflow for the FBT X SUB 118SA

Inputs and pass-through: The X SUB 118SA supports stereo combo XLR/jack in-outs on the control panel, and the technical listing specifies XLR with loop for input connectors—supporting practical feed/loop signal flow in the field.

• Level control: Set sub contribution to match room size, program material, and the tops you are pairing.
• Preset switch (4 DSP presets): Select between two responses with two different cut-off options to fit the system configuration you are building.
• Stereo XLR HP filter outputs: Route high-passed signal to tops for a cleaner, safer full-system handoff.
• Phase reversal (0°/180°): Flip polarity quickly when placement causes cancellations at the crossover region.
• Protection/limit indicators: Monitor status LEDs so you know when the system is approaching protection/limiting behavior.

What Makes the X SUB 118SA a Practical System Builder, Not Just “More Bass”

DSP Presets That Let You Match Tops Instead of Fighting Them

The built-in DSP provides 4 presets (two responses with two different cut-off options), which is the difference between “it is loud” and “it integrates.” Use presets to tailor crossover behavior to the top cabinet and the room goal rather than forcing a one-size setting.

Routing Designed for Clean Signal Flow on Real Gigs

With stereo combo XLR/jack in-outs and stereo XLR high-pass filter outputs, the sub can live as the system’s routing hub. That reduces patching clutter and keeps the rig consistent from show to show—especially valuable for mobile crews and touring workflows.

• In: Stereo feed to the sub
• Out: Loop/through options for system continuity
• HP outs: High-passed outputs for tops

Output and Low-End Reach Tuned for Event-Scale Work

Rated at 38 Hz to 120 Hz (-6 dB) with up to 136 dB half-space, the X SUB 118SA is positioned for gigs where the sub must carry the room—not just fill in. This matters for DJ playback, live kick fundamentals, and program material that needs physical impact.

Wood Cabinet and Hardware Built for Transport Cycles

The enclosure is 18 mm (0.70") birch plywood with scratch-resistant black paint, fitted with two aluminum handles and an M20 top-mounted stand adapter for pole-mount stacks. If your workflow includes long pushes and fast room flips, the optional 100 mm wheel kit support is a practical upgrade path.

How to Deploy the FBT X SUB 118SA in the Field

Start with placement and routing discipline. For DJ and live-event work, place the sub where it can couple to the room effectively, then build the signal flow so tops receive a cleaner, high-passed feed. Choose a DSP preset that matches the tops and the desired cut-off behavior, set level for the room, and use the phase switch to correct cancellations near the crossover zone.

• Stack and pole-mount: Use the M20 top mount when you want a compact, stable sub-and-top footprint.
• Use HP filter outputs: Feed tops from the stereo XLR HP outs to keep low-end load off the top cabinet.
• Preset first, then level: Select the DSP preset/cut-off behavior before final gain staging so the system balance is predictable.
• Phase check at the crossover: Flip 0°/180° if you hear thinning around the crossover region due to placement.
• Transport workflow: For frequent load-ins, plan around the handle placement and optional wheel support for faster venue turns.

Deploy it like a system hub—preset selection, HP routing, and phase control are where the X SUB 118SA earns its keep.

Why Choose the FBT X SUB 118SA from AVMaxx:

Subwoofers are easy to buy and harder to integrate. AVMaxx helps you build a rig that behaves predictably: matching the right sub to your tops, routing the system cleanly, and choosing presets that fit the room and the show. If you are scaling an X LITE or X PRO setup for larger crowds, clubs, or production-style events, we help you get the low end powerful without turning the mix into a guessing game.

AVMaxx is your partner for ProX solutions—field-aware recommendations, dependable support, and builds that help Chicago DJs and event pros perform with confidence.