FBT X-Sub 118SA Active Subwoofer User Manual

1. Introduction

Thank you for choosing the FBT X-Sub 118SA Active Subwoofer. This 18-inch processed compact bass reflex subwoofer is designed to provide powerful and extended low-frequency response, making it an ideal companion for FBT X-LITE and X-PRO series loudspeakers. Featuring a 1200W RMS Class D power amplifier and 4 DSP presets, the X-Sub 118SA delivers exceptional performance for various professional audio applications.

Figure 1.1: FBT X-Sub 118SA Active Subwoofer. This image shows the front and side of the black subwoofer, highlighting its robust grille and integrated side handle.

2. Safety Information

Please read and understand all safety instructions before operating the FBT X-Sub 118SA. Retain this manual for future reference.

• Electrical Safety: Always connect the subwoofer to a grounded power outlet. Do not expose the unit to rain or moisture. Disconnect power during lightning storms or when unused for long periods.
• Ventilation: Ensure adequate ventilation around the unit. Do not block ventilation openings.
• Placement: Place the subwoofer on a stable, level surface. Avoid placing it near heat sources or in direct sunlight.
• Servicing: Do not attempt to service this unit yourself. Refer all servicing to qualified service personnel.
• Fuses: Replace fuses only with the same type and rating as indicated on the unit.
• Hearing Protection: Prolonged exposure to high sound pressure levels can cause permanent hearing damage. Use appropriate hearing protection when operating at high volumes.

3. Package Contents

Verify that all items are present in the package:

• 1 x FBT X-Sub 118SA 18-inch Processed Compact Bass Reflex Active Subwoofer
• 1 x Power Cord
• 1 x User Manual (this document)

4. Key Features

The FBT X-Sub 118SA boasts a range of features designed for optimal audio performance:

• Active bass reflex subwoofer design.
• 18mm / 0.70" birch plywood cabinet construction for durability.
• High excursion 18" woofer with a 3" voice coil.
• Powerful 1200W RMS Class D power amplifier with switching power supply.
• Four (4) DSP presets for versatile sound shaping (2 responses with 2 different cut-off frequencies).
• Frequency response from 38Hz to 120Hz (@-6dB).
• Maximum SPL of 136dB peak (Half Space).
• M20 top mount speaker stand socket for satellite speaker integration.
• Control panel with stereo combo XLR/jack inputs, stereo XLR HP filter outputs, level control, preset switch, 0°/180° phase reversal switch, and PRT/LMT LED indicators.
• Two FBT design aluminum handles for easy transport.
• Optional 100mm / 3.93" transport wheels available.

5. Setup

5.1 Physical Placement

The X-Sub 118SA is designed for floor standing placement. Due to its omnidirectional dispersion, it can be positioned in various locations within a room or stage. For optimal bass response, consider placing the subwoofer near a wall or in a corner, which can acoustically reinforce low frequencies. Ensure the unit is stable and has sufficient space for ventilation.

5.2 Connections

The rear panel of the X-Sub 118SA provides all necessary connections and controls. Refer to the diagram below for a visual guide:

Figure 5.1: FBT X-Sub 118SA Rear Control Panel. This diagram illustrates the input/output connections, voltage selector, power switch, and DSP controls on the rear of the subwoofer.

• Input (IN): Connect your audio source (e.g., mixer, preamplifier) to the XLR/Jack combo inputs. The unit supports stereo input.
• Link (LINK): These XLR outputs allow you to daisy-chain the audio signal to other subwoofers or full-range speakers.
• HP Filter Out (HP FILT OUT): These XLR outputs provide a high-pass filtered signal, ideal for connecting to full-range loudspeakers (e.g., FBT X-LITE or X-PRO series) to ensure proper crossover and system integration.

5.3 Power Connection and Voltage Selection

Before connecting the power cord, ensure the voltage selector switch on the rear panel is set to the correct voltage for your region (100-120V~ or 220-240V~). Incorrect voltage selection can damage the unit. Once the voltage is set, connect the supplied power cord to the IEC inlet and then to a grounded AC power outlet.

6. Operating

6.1 Powering On/Off

After all connections are made, flip the 'ON' switch on the rear panel to power on the subwoofer. The power indicator LED will illuminate. To power off, flip the switch back to 'OFF'.

6.2 Level Control (LEV)

The 'LEV' knob controls the overall output volume of the subwoofer. Start with the level set to minimum and gradually increase it to achieve the desired bass balance with your main speakers.

6.3 DSP Presets

The X-Sub 118SA features 4 DSP presets to optimize its performance for different applications and acoustic environments. Use the 'PRESET' button to cycle through the available options:

1. Preset 1 (ORIGINAL 80Hz): Standard response with an 80Hz low-pass filter.
2. Preset 2 (ORIGINAL 120Hz): Standard response with a 120Hz low-pass filter.
3. Preset 3 (PUNCH 80Hz): Enhanced punchy bass response with an 80Hz low-pass filter.
4. Preset 4 (PUNCH 120Hz): Enhanced punchy bass response with a 120Hz low-pass filter.

Select the preset that best suits your audio content and desired sound profile.

6.4 Phase Reversal (PHASE 0°/180°)

The 'PHASE' switch allows you to invert the phase of the subwoofer's output by 180 degrees. This is crucial for achieving optimal acoustic alignment with your main loudspeakers. Experiment with both 0° and 180° settings to find the position that yields the strongest and most coherent bass response in your listening environment.

6.5 PRT/LMT LED Indicators

The 'PRT/LMT' LED indicates the status of the protection and limiter circuits:

• Green: Normal operation.
• Red (briefly): Limiter is active, indicating that the input signal is approaching or exceeding the maximum safe level. This prevents distortion and protects the speaker.
• Red (solid): Protection circuit is active, indicating a potential fault or overheating. Reduce the input level or power off the unit and allow it to cool down.

7. Maintenance

Proper maintenance ensures the longevity and optimal performance of your FBT X-Sub 118SA.

• Cleaning: Use a soft, dry cloth to clean the exterior of the subwoofer. Do not use abrasive cleaners, solvents, or excessive moisture.
• Storage: When not in use for extended periods, store the subwoofer in a dry, temperate environment, away from direct sunlight and extreme temperatures.
• Inspection: Periodically check the power cord and audio cables for any signs of damage.

8. Troubleshooting

If you encounter issues with your FBT X-Sub 118SA, refer to the following common problems and solutions:

If the problem persists after attempting these solutions, please contact FBT customer support or a qualified service technician.

9. Specifications

Detailed technical specifications for the FBT X-Sub 118SA Active Subwoofer:

9.1 Product Dimensions

Figure 9.1: FBT X-Sub 118SA Subwoofer with Dimensions. The image shows the subwoofer with its approximate dimensions: 31 inches (Depth) x 27 inches (Width) x 32 inches (Height).

• Net Dimension (WxHxD): 510 x 655 x 630 mm
• Product Dimensions (Approximate): 31"D x 27"W x 32"H

10. Warranty

The FBT X-Sub 118SA comes with a limited warranty. For specific details regarding the terms, conditions, and duration of your warranty, please refer to the warranty card included with your product or visit the official FBT website. Retain your proof of purchase for warranty claims.

11. Support

For technical assistance, service, or further inquiries about your FBT X-Sub 118SA, please contact FBT customer support through their official website or authorized distributors. Provide your product model number and a detailed description of the issue when seeking support.