Introduction
The Earthquake Sound SLAPS-M8v2 is an 8-inch mass-tuned passive bass radiator designed to enhance the low-frequency performance of subwoofer systems. This device significantly increases subwoofer efficiency and capability for ultra-low frequency reproduction without requiring additional amplifier power or increasing enclosure volume. Its user-tunable design allows for integration into various subwoofer and enclosure combinations, providing up to +6dB of bass compared to traditional sealed and ported enclosures.
Key Features
- Patented Passive Bass Radiator Design: Allows for precise tuning of even small enclosures to achieve ultra-low frequencies.
- Enhanced Output and Efficiency: When paired with a quality active driver, the SLAPS-M8v2 boosts subwoofer output and efficiency without needing more amplifier power or a larger enclosure.
- Deep, Dynamic Bass: Features a compression-free excursion design that eliminates common port noise distortion, delivering a deep and powerful bass response.
- User-Tunable: Designed for optimal performance across various subwoofer and enclosure setups, including 160g of mass for initial tuning.
- Compact Design: Achieves up to +6dB of bass from a compact volume with a slim mounting depth of less than 3 inches.
Setup
Installation Guidelines
Proper installation is crucial for optimal performance of your SLAPS-M8v2 passive radiator. This device is designed to work in conjunction with an active subwoofer driver within a sealed enclosure.
Enclosure Requirements
- The SLAPS-M8v2 requires a sealed enclosure. Consult your active subwoofer's specifications for recommended enclosure volumes.
- Ensure the enclosure is robust and free from air leaks to prevent performance degradation.
Mounting
The SLAPS-M8v2 is designed for flush mounting. Ensure adequate clearance for the radiator's excursion within the enclosure.
Figure 1: Top view of the SLAPS-M8v2 passive radiator, showing the central bolt for mass adjustment.
Figure 2: Bottom view of the SLAPS-M8v2, illustrating the robust frame structure.
Figure 3: An example of the SLAPS-M8v2 installed in a compact subwoofer enclosure (enclosure not included).
Tuning
The SLAPS-M8v2 is user-tunable to achieve optimal low-frequency response for your specific setup. It comes with 160g of mass for initial tuning. Additional mass can be added or removed to adjust the resonant frequency of the passive radiator. Refer to specialized audio tuning guides or consult an audio professional for precise tuning instructions tailored to your active driver and enclosure volume.
Figure 4: Exploded view of the SLAPS-M8v2, highlighting the mass adjustment mechanism.
Operating
Operation Principles
As a passive device, the SLAPS-M8v2 operates by reacting to the air pressure changes within the sealed enclosure generated by the active subwoofer driver. It is pneumatically coupled to the active driver, allowing for extended low-frequency response without requiring its own power source or voice coil. The movement of the passive radiator enhances the bass output, making the system more efficient.
No direct user operation is required beyond initial tuning and proper installation.
Maintenance
Care and Maintenance
- Cleaning: Use a soft, dry cloth to clean the surface of the passive radiator. Avoid using harsh chemicals or abrasive cleaners.
- Inspection: Periodically inspect the surround and cone for any signs of damage or wear. Ensure all mounting screws are secure.
- Environment: Avoid exposing the passive radiator to extreme temperatures, direct sunlight, or excessive moisture.
Troubleshooting
Troubleshooting Guide
If you experience issues with your SLAPS-M8v2, consider the following:
- Lack of Bass Output:
- Verify that the active subwoofer is functioning correctly.
- Check the enclosure for any air leaks.
- Ensure the passive radiator is properly tuned. Incorrect tuning mass can lead to suboptimal performance.
- Distorted Bass:
- Ensure the active subwoofer is not overdriven.
- Check for any physical obstructions preventing the passive radiator from moving freely.
- Verify that the mounting is secure and there are no loose parts causing rattling.
- Unusual Noises:
- Inspect the passive radiator and enclosure for loose components or air leaks.
- Ensure the passive radiator is not bottoming out or exceeding its excursion limits. This may indicate an issue with tuning or excessive power to the active driver.
For persistent issues, consult a professional audio technician.
Technical Specifications
| Feature | Detail |
|---|---|
| Model Name | SLAPS-M8v2 |
| Speaker Type | Passive Bass Radiator |
| Special Feature | Bass Boost |
| Recommended Uses | For Surround Sound Systems |
| Subwoofer Diameter | 8 Inches |
| Unit Count | 1 Count |
| Included Components | (1) SLAPS-M8v2 Passive Radiator, (1) product insert |
| Product Dimensions (D x W x H) | 6.2D x 22.9W x 22.9H Centimetres |
| Item Weight | 1.46 Pounds |
| Material Type | Plastic Metal |
| Mounting Type | Flush Mount |
| Manufacturer | Earthquake Sound |
Figure 5: Mounting dimensions of the SLAPS-M8v2 with gasket (7.75 in. / 197mm outer diameter, 2.28 in. / 58mm depth).
Figure 6: Mounting dimensions of the SLAPS-M8v2 without gasket (7.75 in. / 197mm outer diameter, 1.69 in. / 43mm depth).
Figure 7: Side view comparison of the SLAPS-M8v2 with gasket (top) and without gasket (bottom).
Warranty and Customer Support
For warranty information and customer support, please refer to the product insert included with your SLAPS-M8v2 passive radiator or visit the official Earthquake Sound website. Keep your proof of purchase for warranty claims.
