Introduction
The FULODE EQ315 is a professional 31-band digital equalizer designed for home audio systems, KTV venues, music studios, and DJ equipment. It features real-time frequency level display, intelligent noise reduction, and versatile connectivity options to enhance your audio experience.
Key Features
- 31-Band Digital Equalization: Offers precise control over audio frequencies with 31 segments and LED spectrum indication for real-time visual feedback.
- 10 Preset Modes & EQ BYPASS: Save up to 10 custom effect presets for quick recall. The EQ BYPASS function allows for simplified machine debugging.
- Intelligent Noise Reduction: Enhances audio clarity by minimizing unwanted background noise.
- Wireless Bluetooth 5.2: Built-in module with an enhanced antenna for stable and low-latency wireless audio streaming.
- USB Connection Playback: Equipped with a USB slot for playing lossless music audio files directly from a USB drive.
- Independent Subwoofer Output: Features a dedicated subwoofer output with adjustable frequency (50Hz-250Hz) for enhanced bass control.
- Versatile Connectivity: Supports XLR balanced and 1/4" TRS unbalanced inputs and outputs, ensuring compatibility with a wide range of audio setups.
- Rack-Mount Design: Standard design for straightforward installation in audio racks.
Safety Information
Please read and understand all safety instructions before operating this device. Keep this manual for future reference.
- Power Source: Connect the unit only to the specified power supply. Ensure the voltage matches the unit's requirements.
- Ventilation: Do not block ventilation openings. Ensure adequate airflow around the unit to prevent overheating.
- Water and Moisture: Do not expose the unit to rain, moisture, or excessive humidity. Do not place objects filled with liquids on the unit.
- Servicing: Do not attempt to service this unit yourself. Refer all servicing to qualified service personnel.
- Placement: Place the unit on a stable, level surface. Avoid placing it near heat sources or in direct sunlight.
Setup
1. Unpacking and Inspection
Carefully remove the EQ315 from its packaging. Inspect the unit for any signs of damage during transit. Retain the packaging for future transport or storage.
2. Rack Mounting (Optional)
The EQ315 is designed for standard 19-inch rack mounting. Secure the unit using appropriate rack screws (not included) to ensure stability.

Figure 1: Front and Rear Panels of the FULODE EQ315 Equalizer. This image shows the overall design and layout of the unit, highlighting its rack-mountable form factor and various input/output options.
3. Connecting Audio Devices
The EQ315 offers multiple input and output options for versatile integration into your audio system.

Figure 2: Rear Panel Connections. This image details the various input and output ports available on the EQ315, including XLR, 1/4" TRS, RCA, and the independent subwoofer output.
- XLR Inputs/Outputs: Use XLR cables for balanced audio connections to professional audio equipment like mixers or power amplifiers.
- 1/4" TRS Inputs/Outputs: Use 1/4" TRS cables for unbalanced audio connections to compatible devices.
- RCA Inputs/Outputs: Use RCA cables for connecting to consumer-grade audio equipment such as home theater receivers or CD players.
- Subwoofer Output (XLR): Connect your subwoofer to this dedicated XLR output. The frequency can be adjusted later during operation.
4. Power Connection
Connect the provided power cord to the AC INPUT on the rear panel of the EQ315 and then to a suitable power outlet. Ensure the power switch is in the OFF position before connecting.
Operating Instructions
1. Powering On/Off
Press the POWER button on the front panel to turn the unit ON or OFF. The LED spectrum display will illuminate upon power-on.
2. Basic Equalization Adjustment
The EQ315 features 31 frequency bands, each with an individual slider for precise adjustment. The LED spectrum display provides real-time visual feedback of the sound quality condition.

Figure 3: 31-Band Digital Equalizer Display. This image illustrates the visual feedback provided by the LED spectrum, showing the real-time frequency levels.
You can also adjust bass, midrange, and treble equalization independently:

Figure 4: Bass, Midrange, and Treble Equalization. This image shows the separate controls for bass (20-250Hz), midrange (315-2500Hz), and treble (3.15-20KHz) adjustments.
- Bass Equalization: Adjust frequencies from 20-250Hz.
- Midrange Equalization: Adjust frequencies from 315-2500Hz.
- Treble Equalization: Adjust frequencies from 3.15-20KHz.
- Use the GAIN knob to select the spectrum and the VOLUME knob to adjust the intensity.
3. Preset Modes and EQ BYPASS
The EQ315 allows you to save and recall up to 10 custom equalization settings.

Figure 5: Save and Recall Function. This image highlights the SAVE and RECALL buttons used for managing custom equalization presets.
- Saving a Preset: Adjust the EQ settings to your preference. Lightly press the SAVE button and rotate the GAIN or VOLUME knob to select a mode from 1-10. Press SAVE again to confirm.
- Recalling a Preset: Press the RECALL button to select a saved mode.
- EQ BYPASS: Press the BYPASS button to temporarily disable the equalizer effect, allowing for direct comparison or simplified debugging.
4. Bluetooth Connection
The EQ315 features a built-in Bluetooth 5.2 module for wireless audio streaming.

Figure 6: Bluetooth and USB Features. This image shows the Bluetooth antenna and USB port, illustrating the wireless and wired digital audio input options.
- Ensure the enhanced antenna is properly connected to the rear panel.
- Activate Bluetooth on your mobile device or computer.
- Search for "FULODE EQ315" (or similar) in your device's Bluetooth settings and pair.
5. USB Playback
Insert a USB drive containing lossless music audio files into the USB slot on the front panel. The unit will automatically detect and begin playback.
6. Subwoofer Output Adjustment
The independent subwoofer output allows for fine-tuning of bass frequencies.

Figure 7: Independent Subwoofer Output. This image details the LEVEL and FREQ controls for the dedicated subwoofer output on the rear panel.
- LEVEL: Adjusts the gain (volume) of the subwoofer output.
- FREQ: Adjusts the operating frequency of the subwoofer output between 50Hz-250Hz.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the unit. Do not use abrasive cleaners or solvents.
- Ventilation: Regularly check that the ventilation openings are clear of dust and debris.
- Storage: If storing the unit for an extended period, disconnect it from power and store it in a cool, dry place, preferably in its original packaging.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cord not connected; Power outlet faulty; Unit power switch off. | Ensure power cord is securely connected. Test power outlet with another device. Turn the unit's power switch ON. |
| No sound output | Incorrect audio connections; Input source not playing; Volume too low; EQ BYPASS engaged. | Check all audio cables and connections. Verify the input source is active and playing. Increase the volume on the EQ315 and connected devices. Disengage EQ BYPASS. |
| Distorted sound | Input signal too high; EQ settings too extreme; Faulty cables. | Reduce the input level from the source device. Adjust EQ sliders to less extreme positions. Check and replace audio cables if necessary. |
| Bluetooth not connecting | Bluetooth not enabled on device; Unit not in pairing mode; Interference. | Ensure Bluetooth is active on your device. Restart both the EQ315 and your Bluetooth device. Move closer to the unit to reduce interference. |
| USB playback not working | USB drive not formatted correctly; Unsupported file format; USB drive faulty. | Ensure USB drive is formatted to a compatible file system (e.g., FAT32). Verify audio files are in a supported format (e.g., MP3, WAV). Try a different USB drive. |
Specifications
| Feature | Detail |
|---|---|
| Model Number | EQ315 |
| Item Weight | 4.44 pounds |
| Package Dimensions | 21 x 9 x 3 inches |
| Country of Origin | China |
| Color Name | Black |
| Power Source | Corded Electric |
| Bluetooth Version | 5.2 |
| Subwoofer Frequency Range | 50Hz-250Hz |
Warranty and Support
FULODE products are manufactured to high quality standards. For warranty information and technical support, please refer to the purchase documentation or contact FULODE customer service directly.
You can also visit the official FULODE store for more information: FULODE Store