FBT X-SUB 115SA Speaker

FBT X-SUB 115SA Active Subwoofer

The FBT X-SUB 115SA is a powerful bass-reflex active subwoofer designed to extend the low-frequency response of standard audio systems. This model pairs perfectly with the FBT X-LITE and X-PRO series full-range speakers, but it can also be easily integrated into systems from other manufacturers. The cabinet is constructed from 15mm thick birch plywood and features a scratch-resistant paint finish, making it highly durable for constant transport and intensive stage use.

Inside, it houses a 15-inch woofer with a 3-inch voice coil, driven by an efficient 1200W RMS Class D amplifier. The system is managed by an integrated DSP processor featuring four selectable presets. These allow you to quickly tailor the low-frequency response and match the crossover frequency to your top speakers. The rear panel provides stereo XLR connections, making it easy to route the signal further—either in full-range ("Link") or with the low frequencies filtered out ("High-pass"). The top of the cabinet also includes a standard M20 thread for mounting a speaker pole.

Key Features

• 15-inch woofer with a high-excursion 3-inch voice coil.
• 1200W RMS Class D amplifier with a switch-mode power supply.
• DSP processor with 4 distinct EQ presets.
• Sturdy 15mm birch plywood cabinet with built-in transport handles.
• Stereo XLR inputs and outputs for quick and flexible system routing.

Technical Specifications

• Manufacturer: FBT.
• Model: X-SUB 115SA.
• Type: Active subwoofer (Bass-reflex).
• Woofer (LF): 15-inch (with a 3-inch voice coil).
• Amplifier Power: 1200W RMS (Class D).
• Frequency Response: 42 Hz – 120 Hz.
• Maximum SPL: 135 dB.
• DSP: 4 factory presets.
• Cabinet: 15mm birch plywood with scratch-resistant coating.
• Connections: 2 x XLR IN, 2 x XLR OUT (Link / High-pass).
• Pole Mount Thread: M20.
• Weight: 30 kg.
• Product Code: X-SUB 115SA

Included in the Box

• 1 x FBT X-SUB 115SA active subwoofer.
• 1 x Power cable.

Best For

• Event audio engineers and DJs looking for mobile yet powerful low-end reinforcement.
• Clubs, bars, and rehearsal spaces as a reliable part of a permanent PA system.
• Live bands using portable PA setups for their performances.

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