1. Introduction
This manual provides essential information for the safe and efficient operation of your RCF SUB 905-AS MK3 15-inch 2,200-watt Active Subwoofer. Please read these instructions thoroughly before installation and use to ensure optimal performance and longevity of the product. The RCF SUB 905-AS MK3 is a high-performance active subwoofer designed for professional audio applications, featuring a 15-inch woofer, 2,200 watts of Class D power, and advanced DSP processing for precise low-frequency reproduction.
2. Important Safety Information
Always adhere to the following safety precautions to prevent electric shock, fire, or injury.
- Power Supply: Connect the unit only to an AC mains outlet with the specified voltage and frequency. Ensure the power cord is undamaged and properly grounded.
- Ventilation: Do not block ventilation openings. Ensure adequate airflow around the unit to prevent overheating.
- Moisture: Do not expose the unit to rain or moisture. Keep liquids away from the unit.
- Servicing: Do not attempt to service this product yourself. Refer all servicing to qualified service personnel.
- Placement: Place the subwoofer on a stable, level surface. Avoid placing it near heat sources or in direct sunlight.
- Hearing Protection: Prolonged exposure to high sound pressure levels can cause permanent hearing damage. Use appropriate hearing protection when operating the subwoofer at high volumes.
3. Package Contents
Verify that all items are present in the package:
- RCF SUB 905-AS MK3 Active Subwoofer
- Power Cable
- User Manual (this document)
4. Setup
4.1 Physical Placement
Proper placement of the subwoofer is crucial for optimal sound performance. Consider the following:
- Room Acoustics: Room boundaries significantly affect bass response. Experiment with different positions to find the best balance. Corner placement often provides maximum bass output but can sometimes lead to uneven response.
- Stacking: The SUB 905-AS MK3 is designed to be stackable. Ensure stable stacking if using multiple units.
- Handles: Utilize the built-in handles for safe and easy transport and positioning of the unit.
Figure 1: Front and side view of the RCF SUB 905-AS MK3 Active Subwoofer, showing the protective grille and integrated side handles.
4.2 Connections
Before making any connections, ensure the subwoofer and all connected audio equipment are powered off.
- Power Connection: Connect the supplied power cable to the AC IN socket on the rear panel of the subwoofer and then to a suitable grounded mains outlet.
- Audio Input: Connect your audio source (e.g., mixer, sound processor) to the INPUT connectors on the rear panel. The SUB 905-AS MK3 typically accepts balanced XLR inputs.
- Audio Output: Use the OUTPUT connectors to send the processed audio signal to full-range loudspeakers or other subwoofers. These outputs often include a high-pass filter to optimize the signal for top cabinets.
5. Operating Instructions
5.1 Powering On/Off
To power on the subwoofer, ensure all connections are secure, then flip the POWER switch on the rear panel to the 'ON' position. Power off by flipping the switch to 'OFF'. It is recommended to power on subwoofers last and power off first in an audio system to prevent transient noises.
5.2 Controls and Indicators
The rear panel of the SUB 905-AS MK3 features various controls and indicators for precise sound adjustment:
- Volume/Gain Control: Adjusts the overall output level of the subwoofer.
- Presets: Select from various factory presets optimized for different applications or sound characteristics.
- Crossover Frequency: Sets the frequency point where the subwoofer handles frequencies below and sends higher frequencies to the outputs for full-range speakers. Common settings include 80Hz, 100Hz, 120Hz.
- Polarity: Inverts the phase of the subwoofer's output. Adjust this to achieve optimal acoustic coupling with full-range speakers.
- Cardioid Mode: Activates a cardioid dispersion pattern, reducing bass energy behind the subwoofer, useful for stage monitoring or reducing unwanted reflections.
- Time Delay: Allows for precise alignment of the subwoofer's output with other speakers in the system, compensating for physical distance differences.
- Status LEDs: Indicators for power, signal presence, and limiter activation.
5.3 Basic Operation
- Set the Volume/Gain control to a low level.
- Power on the subwoofer and your audio source.
- Gradually increase the Volume/Gain control to the desired listening level.
- Adjust the Crossover Frequency, Polarity, and Time Delay settings as needed to integrate the subwoofer seamlessly with your main speakers.
6. Maintenance
6.1 Cleaning
Regular cleaning helps maintain the appearance and performance of your subwoofer.
- Disconnect the power cable before cleaning.
- Use a soft, dry cloth to wipe down the exterior surfaces.
- For stubborn dirt, a slightly damp cloth with mild soap can be used, followed by a dry cloth.
- Do not use abrasive cleaners, solvents, or harsh chemicals.
- Keep the grille free of dust and debris to ensure proper sound dispersion.
6.2 Storage
If storing the subwoofer for an extended period, ensure it is:
- Stored in a dry, temperature-controlled environment.
- Protected from dust and physical damage, ideally in its original packaging or a protective cover.
7. Troubleshooting
Refer to the table below for common issues and their solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable disconnected; Power switch off; Faulty power outlet | Check power cable connection; Ensure power switch is ON; Test power outlet with another device |
| No sound output | Input cable disconnected; Volume/Gain too low; Incorrect source selection; Limiter engaged | Check input cable connections; Increase Volume/Gain; Verify audio source is active; Reduce input level if limiter LED is constantly on |
| Distorted sound | Input signal too high; Damaged speaker component; Incorrect DSP settings | Reduce input signal level; Contact RCF support for service; Review Crossover, Polarity, and Preset settings |
| Weak bass response | Incorrect placement; Polarity issue; Crossover frequency too high | Adjust subwoofer placement; Try inverting polarity; Lower the crossover frequency |
8. Technical Specifications
- Model: SUB 905-AS MK3
- Type: Active Subwoofer
- Woofer: 15-inch ceramic-magnet
- Amplifier: 2,200-watt Class D
- Frequency Response: Down to 40Hz
- Maximum SPL: 133dB
- Processing: Bass Motion Control (BMC) DSP, Presets, Crossover, Polarity, Cardioid Mode, Time Delay
- Cabinet Material: Rugged plywood
- Finish: Scratch-resistant polyurea coating
- Grille: Steel
- Dimensions (H x W x D): Approximately 25.59 x 18.9 x 25.2 inches (650 x 480 x 640 mm)
- Weight: Approximately 77.9 pounds (35.3 kg)
9. Warranty Information
RCF products are designed and manufactured to the highest quality standards. This product is covered by a limited warranty against defects in materials and workmanship. The specific terms and duration of the warranty may vary by region and product. Please retain your proof of purchase for warranty claims. For detailed warranty information, please refer to the official RCF website or contact your local distributor.
10. Customer Support
If you encounter any issues not covered in this manual or require further assistance, please contact RCF customer support or your authorized RCF dealer. You can find contact information and additional resources on the official RCF website: www.rcf.it
