Introduction
Welcome to the RECOIL SS65 Ultra-Thin 6.5" Active Under Seat Car Subwoofer manual. This document provides essential information for the safe and effective use of your new car audio component. Please read this manual thoroughly before installation and operation.
The RECOIL SS65 is engineered to deliver powerful bass in a compact form factor, fitting conveniently under most vehicle seats. It features a 6.5-inch low-impedance woofer, a built-in Class D amplifier, and VB BASS Virtual Bass Enhancement technology, ensuring a rich audio experience without sacrificing cabin space.
Safety Precautions
To prevent injury or damage to the unit, please observe the following safety guidelines:
- Professional Installation Recommended: If you are unsure about installation procedures, consult a qualified car audio technician.
- Disconnect Battery: Always disconnect the vehicle's negative battery terminal before beginning any electrical work to prevent short circuits.
- Avoid Moisture: Do not expose the subwoofer to water or excessive moisture.
- Proper Ventilation: Ensure the subwoofer is installed in a location with adequate airflow to prevent overheating.
- Correct Wiring: Use appropriate gauge wiring and ensure all connections are secure and properly insulated. Incorrect wiring can cause damage to the unit or vehicle.
- Secure Mounting: Mount the subwoofer securely to prevent it from becoming a projectile in the event of a sudden stop or accident.
Package Contents
Verify that all items are present in your package:
- RECOIL SS65 6.5" Active Under-Seat Car Subwoofer
- RCA adapter
- Wired remote knob
- Mounting brackets
- Anti-vibration pads
- User Manual (this document)

Image: Contents of the RECOIL SS65 package, including the subwoofer, user manual, RCA adapter, remote knob, mounting brackets, and anti-vibration pads.
Product Overview
Low-Impedance Design
The SS65 features an exclusive 0.4 Ohm low-impedance woofer paired with a high-current Class D amplifier. This design maximizes power transfer and efficiency, resulting in deeper bass and cleaner sound with reduced distortion.

Image: The RECOIL SS65 subwoofer with callouts for its 6.5-inch size, 250 Watts RMS power, 0.4 Ohm impedance, and 3-inch height, illustrating its compact and powerful design.
VB BASS Virtual Bass Enhancement
Integrated DSP technology enhances low-frequency perception, making the bass sound larger and more impactful, especially beneficial for factory audio systems.
Controls and Connections
The SS65 offers comprehensive tuning controls for optimal sound customization. Familiarize yourself with the input and output panel:

Image: Detailed view of the RECOIL SS65's input and output panel, showing labeled controls for Bass Boost, Low-Pass Crossover (X-Over), Phase Shift, VB Bass, Input Gain, Remote Bass Level, RCA Level Input, and the Power Connector.
- Power Status LED: Indicates the operational status of the subwoofer.
- Bass Boost: Adjusts the level of bass enhancement.
- X-Over (Low-Pass Crossover): Sets the upper frequency limit for the subwoofer.
- Phase Shift (0°/180°): Adjusts the phase of the subwoofer output.
- VB Bass (ON/OFF): Activates or deactivates the Virtual Bass Enhancement.
- Gain Control: Adjusts the input sensitivity.
- Remote Bass Level Input: Connection for the wired remote control.
- RCA Level Input: For connecting to head units with RCA pre-outs.
- Power Connector: Terminals for +12V, Remote (REM), and Ground (GND) connections.
Dimensions and Placement
The ultra-thin design of the SS65 allows for flexible placement options, most commonly under a vehicle seat.

Image: The RECOIL SS65 subwoofer discreetly placed under a car seat, illustrating its compact form factor and minimal intrusion into cabin space.

Image: Top and side views of the RECOIL SS65 subwoofer with precise measurements, indicating its length of 8.62 inches (219mm), width of 7.64 inches (194mm), and height of 3.00 inches (77mm).
Setup and Installation
Before You Begin
- Disconnect the vehicle's negative battery terminal.
- Plan your wiring path to avoid interference and ensure proper length.
- Choose a mounting location that provides adequate ventilation and is secure.
Mounting the Subwoofer
Secure the subwoofer using the provided mounting brackets and anti-vibration pads. Ensure the unit is firmly attached to a solid surface to prevent movement. Allow sufficient space around the unit for heat dissipation.
Wiring Connections
Follow these steps for proper wiring. Refer to the 'Controls and Connections' image for visual guidance.
- Power Connection (+12V): Connect the +12V terminal on the subwoofer to the vehicle's positive battery terminal. An in-line fuse (not included, but highly recommended) should be installed as close to the battery as possible.
- Ground Connection (GND): Connect the GND terminal to a clean, unpainted metal surface on the vehicle chassis. Ensure a solid, low-resistance connection.
- Remote Turn-On (REM): Connect the REM terminal to the remote turn-on output of your head unit. This wire signals the subwoofer to turn on and off with your car's audio system. If your head unit lacks a dedicated remote output, you may use an ignition-switched 12V source, or utilize the high-level input's auto-sense feature if available.
- Audio Input:
- RCA Input: If your head unit has RCA pre-outs, connect RCA cables from the head unit to the subwoofer's RCA inputs.
- High-Level Input: If your head unit does not have RCA outputs, use the provided high-level input adapter to connect directly to your vehicle's speaker wires.
Operating the Subwoofer
Initial Setup and Gain Adjustment
- After all connections are made, reconnect the vehicle's negative battery terminal.
- Turn on your car audio system.
- Set the subwoofer's GAIN control to its minimum position.
- Play music with strong bass content at a moderate volume level from your head unit.
- Slowly increase the GAIN control on the subwoofer until the desired bass level is achieved without any audible distortion. If distortion occurs, reduce the gain slightly.
Tuning Controls
- GAIN Control: Adjusts the input sensitivity to match the output voltage of your head unit. Proper gain setting is crucial for optimal performance and to prevent distortion.
- LOW-PASS CROSSOVER (X-OVER): This control sets the upper frequency limit for the subwoofer, typically adjustable from 50Hz to 150Hz. Frequencies above this setting will be filtered out, ensuring the subwoofer only reproduces low-frequency sounds. Adjust this to blend smoothly with your main speakers.
- PHASE Switch (0°/180°): This switch adjusts the phase of the subwoofer's output relative to your main speakers. Experiment with both 0° and 180° settings to find the one that provides the most impactful and cohesive bass response in your vehicle.
- BASS BOOST: Provides an adjustable bass enhancement (+0-12dB) at a specific low frequency. Use this control sparingly to add extra punch to your bass. Excessive use can lead to distortion.
- VB BASS: Toggles the Virtual Bass Enhancement DSP on or off. Activate it for an enhanced low-frequency perception, making the bass sound fuller.
Wired Remote Control
The included wired remote allows for convenient, on-the-fly adjustment of the bass level from the driver's seat. Connect the remote to the "REMOTE" port on the subwoofer. This control only adjusts the bass level and does not affect other tuning settings.
Maintenance
The RECOIL SS65 is designed for durability and requires minimal maintenance. Follow these guidelines to ensure its longevity:
- Cleaning: Keep the subwoofer clean and free from dust and debris. Use a soft, dry cloth for cleaning. Avoid using harsh chemicals or abrasive cleaners.
- Ventilation: Ensure that the area around the subwoofer remains clear to allow for proper airflow and prevent overheating.
- Environmental Conditions: Avoid exposing the unit to extreme temperatures, direct sunlight for prolonged periods, or excessive moisture.
Troubleshooting Guide
If you encounter issues with your RECOIL SS65 subwoofer, consult the table below for common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Power / Power LED Off |
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| No Sound Output |
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| Distorted Sound |
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| Weak or Lackluster Bass |
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Technical Specifications
| Feature | Specification |
|---|---|
| Brand | RECOIL |
| Model Name / Number | SS65 |
| Speaker Type | Subwoofer |
| Speaker Maximum Output Power | 250 Watts |
| Connectivity Technology | RCA |
| Mounting Type | Car Mount |
| Product Dimensions (D x W x H) | 7.62 x 19.41 x 21.89 cm (3.00 x 7.64 x 8.62 inches) |
| Item Weight | 4.4 kg |
| Unit Count | 1.0 Count |
| Built-In Media | 6.5" Under-Seat Car Subwoofer, RCA adapter, remote knob, mounting brackets, and anti-vibration pads. |
| Manufacturer | RECOIL |
| Place of Business | 3757 E Broadway Rd Suite 3 Arizona Phoenix 85040 |
Warranty and Customer Support
Warranty Information
For detailed warranty information regarding your RECOIL SS65 subwoofer, please refer to the warranty card or documentation included with your original purchase. Keep your proof of purchase for any warranty claims.
Customer Support
Should you require technical assistance, have questions about installation, or need to report an issue, please contact RECOIL customer service directly. You can typically find contact information on the manufacturer's website or through your retailer.
Manufacturer Contact Information:
RECOIL
3757 E Broadway Rd Suite 3
Phoenix, Arizona 85040