1. Introduction
Thank you for purchasing the Gravity EQ15 1/2 Din Five Equalization Bands Car Audio Equalizer. This unit is designed to provide precise control over your car audio system's sound output, allowing you to fine-tune the audio to your personal preferences. With its high voltage RCA outputs and multiple equalization bands, the EQ15 offers enhanced audio performance and flexibility. Please read this manual thoroughly before installation and operation to ensure proper use and to maximize the performance of your equalizer.
Image: The Gravity EQ15 Car Audio Equalizer, showcasing its compact design and front panel controls with illuminated knobs, along with the top panel indicating input and output connections.
2. Setup
2.1. Unpacking and Inspection
Carefully remove the equalizer from its packaging. Inspect the unit and all included accessories for any signs of damage. If any items are missing or damaged, contact your dealer immediately.
Included Components:
- Gravity EQ15 Equalizer Unit
- Mounting Brackets
- Mounting Screws
- Power Connector with Fuse Ready Wire
Image: The Gravity EQ15 equalizer shown alongside its mounting brackets, screws, and power connector, illustrating the complete package contents.
2.2. Mounting
Choose a suitable location in your vehicle for mounting the EQ15. Ensure the location provides adequate ventilation and is away from direct heat sources or moisture. Use the provided mounting brackets and screws to securely fasten the unit.
2.3. Wiring and Connections
The EQ15 features high voltage gold-plated pre-amp RCA outputs for optimal signal transfer. Ensure all connections are secure and properly insulated to prevent short circuits.
Power Connections:
- +12V (RED): Connect to a switched +12V power source (e.g., ignition wire).
- GND (BLACK): Connect to a solid chassis ground point in the vehicle.
- REM (BLUE): Connect to the remote turn-on lead from your head unit or amplifier.
Audio Connections:
- MAIN IN (RCA): Connect the RCA outputs from your head unit to the Main Input of the equalizer.
- AUX IN (RCA/3.5mm): For an auxiliary audio source, connect to the AUX input.
- FRONT OUT (RCA): Connect to the front channel inputs of your amplifier.
- REAR OUT (RCA): Connect to the rear channel inputs of your amplifier.
- SUBWOOFER OUT (RCA): Connect to the subwoofer channel input of your amplifier.
Image: The rear panel of the Gravity EQ15, clearly showing the various RCA input and output connections for main, auxiliary, front, rear, and subwoofer audio, along with the power terminal block.
3. Operating Instructions
The Gravity EQ15 provides comprehensive control over your audio system. Familiarize yourself with the front panel controls for optimal sound tuning.
Image: A close-up view of the Gravity EQ15's front panel, highlighting the illuminated rotary controls for volume, fader, subwoofer, sub effect level, and the five equalization bands, along with the digital voltage display and input select switch.
3.1. Front Panel Controls
- Volume: Master volume control for the entire system.
- Fader: Adjusts the balance between front and rear speaker outputs.
- Sub: Controls the output level of the subwoofer channel.
- Sub Effect Level: Adjusts the intensity of the subwoofer effect.
- Voltage Display: Digital display showing the system's voltage.
- Equalization Bands: Seven fully adjustable -12 dB to +12 dB EQ bands for precise frequency tuning:
- 50 Hz
- 125 Hz
- 320 Hz
- 750 Hz
- 2.2 kHz
- 6 kHz
- 16 kHz
- Input Select / AUX: Switch to select between Main RCA input and Auxiliary (3.5mm/RCA) input.
3.2. Adjusting Equalization
Use the individual rotary controls for each of the seven frequency bands to boost or cut specific frequencies. This allows you to compensate for vehicle acoustics, speaker characteristics, or personal listening preferences. Adjust these controls incrementally and listen carefully to the changes in sound.
3.3. Volume, Fader, and Subwoofer Control
Set the master Volume to a comfortable listening level. Use the Fader control to balance the sound between your front and rear speakers. The Sub control allows you to independently adjust the bass level from your subwoofer, while the Sub Effect Level can further enhance the low-frequency impact.
4. Maintenance
The Gravity EQ15 is designed for reliable operation with minimal maintenance. To ensure longevity and optimal performance:
- Keep the unit clean by wiping it with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Ensure all connections remain secure. Periodically check wiring for any signs of wear or corrosion.
- Avoid exposing the unit to extreme temperatures, direct sunlight, or excessive moisture.
5. Troubleshooting
If you experience issues with your Gravity EQ15, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power | Blown fuse; Incorrect wiring; Loose power connection. | Check and replace fuse if necessary; Verify all power and ground connections are correct and secure. |
| No Sound Output | Incorrect input/output connections; Amplifier not powered; Volume too low; Input Select switch incorrect. | Check all RCA connections; Ensure amplifier is on; Increase volume; Verify Input Select is set to the correct source (Main or AUX). |
| Distorted Sound | Input signal too high; EQ bands set too aggressively; Loose connections. | Reduce input level from head unit; Adjust EQ bands to a less extreme setting; Check all audio connections. |
| Voltage Display Inaccurate | Minor calibration variance. | The voltage display is for general reference. For precise voltage measurements, use a multimeter. |
6. Specifications
- Model: GR-EQ15
- Equalization Bands: 7 (50 Hz, 125 Hz, 320 Hz, 750 Hz, 2.2 kHz, 6 kHz, 16 kHz)
- EQ Adjustment Range: -12 dB to +12 dB
- Output Channels: 6 (Front, Rear, Subwoofer)
- Maximum Output Voltage: Up to 9 Volts RMS (High Voltage Gold Plated Pre-Amp RCA)
- Headroom: 20 dB (Eliminates Signal Overload)
- Input Options: Main RCA, AUX (RCA/3.5mm)
- Dimensions: Approximately 4 x 7 x 10 inches
- Weight: Approximately 1.79 pounds
7. Warranty and Support
7.1. Limited Warranty
Gravity products are manufactured to the highest quality standards. This product comes with a limited warranty against defects in materials and workmanship. The duration and terms of the warranty may vary by region and retailer. Please retain your proof of purchase for warranty claims. For specific warranty details, refer to the documentation provided with your purchase or contact your authorized Gravity dealer.
7.2. Customer Support
For technical assistance, troubleshooting, or general inquiries regarding your Gravity EQ15, please visit the official Gravity website or contact their customer support department. Contact information can typically be found on the manufacturer's website or on your product packaging.
