Introduction
The BESTISAN SW65D is a compact, high-quality powered home audio subwoofer designed to enhance your home theater, gaming, or music listening experience. It delivers accurate bass with added depth, making movies, games, and music more immersive. This manual provides detailed instructions for setting up, operating, and maintaining your subwoofer to ensure optimal performance.

Image: Front view of the BESTISAN SW65D Powered Subwoofer, showcasing its compact design and side-firing woofer.
Key Features
- Powerful Bass, Compact Design: Experience deep bass response (35Hz-200Hz) from a space-saving 6.5-inch powered subwoofer, ideal for home theater, music, and TV sound enhancement without requiring large equipment.
- Engineered for Impact: Features a high-rigidity 6.5-inch side-firing woofer, a bass-reflex cabinet with a bottom port, and internal bracing. This design delivers tight, smooth low-end punch in a stylish black oak finish.
- Universal Connectivity: Supports RCA, Aux, and LFE inputs, along with high speaker level inputs/outputs. This allows for seamless pairing with various audio devices including home theater receivers, TVs, soundbars, and bookshelf speakers, optimizing bass reproduction in diverse setups.
- Cinematic Home Theater Upgrade: Designed to provide an immersive audio experience for movies and sports. Connects easily via standard 3.5mm/RCA to AV receivers, transforming your living space into a dynamic audio environment.
- Optimal Performance Pairing: Recommended for use with devices outputting ≤850mV to prevent overload shutdown. For best results, consider pairing with BESTISAN soundbars or bookshelf speakers for coordinated audio synergy.

Image: Diagram illustrating the 6.5-inch side-firing Dynamic Balance Woofer and high-roll foam surrounds, designed for deep bass without distortion.
Package Contents
Upon unpacking, please ensure all the following items are present and in good condition:
- BESTISAN SW65D Powered Subwoofer
- User Manual
- Coaxial Cable (1.5M)
- Power Adapter

Image: Visual representation of the package contents, including the subwoofer, user manual, coaxial cable, and power adapter.
Product Overview
Familiarize yourself with the various controls and connection ports on the rear panel of your BESTISAN SW65D subwoofer.

Image: Detailed view of the subwoofer's rear panel, labeling the Low Pass Dial, Volume Control, Aux In, Power Switch, LED Indicator, Phase Switch, LFE In, Audio In, High-Speaker Input, and High-Speaker Output.
- Low Pass Dial: Adjusts the crossover frequency, determining the highest frequency the subwoofer will reproduce.
- Volume Control: Adjusts the overall output level of the subwoofer.
- Aux In: Standard 3.5mm auxiliary input for connecting audio sources.
- Power Switch: Turns the subwoofer power ON or OFF.
- LED Indicator: Displays the power status of the subwoofer.
- Phase Switch: Adjusts the phase of the subwoofer output (0° or 180°) to match the main speakers.
- LFE In: Dedicated Low-Frequency Effects input for home theater receivers.
- Audio In (RCA): Standard RCA stereo inputs for connecting audio sources.
- High-Speaker Input: Connects directly to the speaker outputs of an amplifier or receiver.
- High-Speaker Output: Passes the signal from the High-Speaker Input to your main speakers.
Setup and Installation
Placement
The placement of your subwoofer significantly impacts its performance. Experiment with different locations to find the best sound for your room. Generally, placing the subwoofer in a corner can enhance bass output, while placing it near your main speakers can improve sound integration. Avoid placing it directly against a wall if it causes excessive booming.
Initial Connection
- Power Off: Ensure all audio equipment, including the subwoofer, is powered off before making any connections.
- Connect Audio Source: Choose the appropriate input method (RCA, LFE, AUX, or High-Level Speaker Input) based on your audio system. Refer to the "Connectivity Options" section for details.
- Connect Power: Plug the power adapter into the subwoofer's power input, then plug the adapter into a wall outlet.
- Power On: Turn on your audio source first, then turn on the subwoofer using the Power Switch on the rear panel.
Connectivity Options
The BESTISAN SW65D offers multiple ways to connect to your audio system:
- RCA/LFE Input:
For receivers or soundbars with a dedicated subwoofer output (LFE or Sub Out), connect a single RCA cable from the receiver's subwoofer output to the LFE In port on the subwoofer. If your receiver has stereo RCA outputs for a subwoofer, use both the left and right Audio In (RCA) ports.
- AUX Input:
Use a 3.5mm audio cable to connect devices with a headphone jack or line-out to the Aux In port on the subwoofer.
- High-Level Speaker Input/Output:
If your amplifier or receiver does not have a dedicated subwoofer output, you can connect the subwoofer using the High-Speaker Input. Connect the speaker wires from your amplifier's left and right speaker outputs to the corresponding High-Speaker Input terminals on the subwoofer. Then, connect your main speakers from the High-Speaker Output terminals on the subwoofer.
Note: When using high-level inputs, ensure your amplifier outputs ≤850mV to prevent potential overload or damage.
Operating Instructions
Adjusting Volume
Use the Volume Control knob on the rear panel to adjust the subwoofer's output level. Start with a low volume and gradually increase it until the bass blends seamlessly with your main speakers without overpowering them.
Setting Crossover Frequency (Low Pass Dial)
The Low Pass Dial controls the upper frequency limit of the subwoofer. This setting should be adjusted based on the low-frequency capabilities of your main speakers. A good starting point is typically 80Hz-100Hz. If your main speakers are small, set the crossover higher (e.g., 100Hz-120Hz). If your main speakers have good bass response, set it lower (e.g., 60Hz-80Hz). Adjust until the transition between the subwoofer and your main speakers sounds smooth and natural.
Phase Adjustment
The Phase Switch (0° or 180°) helps ensure the subwoofer's sound waves are in sync with your main speakers. Listen to music with strong bass and switch between 0° and 180°. Choose the setting that produces the most impactful and coherent bass. This often depends on the subwoofer's placement relative to your main speakers.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the exterior of the subwoofer. Do not use liquid cleaners or aerosol sprays, as they may damage the finish or internal components.
- Ventilation: Ensure adequate airflow around the subwoofer. Do not block any ventilation openings.
- Environment: Avoid exposing the subwoofer to extreme temperatures, humidity, or direct sunlight. Keep it away from sources of heat and moisture.
- Power Cord: Regularly inspect the power cord for any damage. If damaged, discontinue use and contact support.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No sound from subwoofer. |
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| Subwoofer frequently turns off (auto-shutoff). |
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| Bass sounds boomy or unclear. |
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Technical Specifications
| Model Name | SW65D |
| Speaker Type | Subwoofer |
| Subwoofer Diameter | 6.5 Inches |
| Speaker Maximum Output Power | 50 Watts |
| Frequency Response | 35Hz-200Hz (as per feature bullets) |
| Connectivity Technology | Wired (RCA, LFE, AUX, High-Level Speaker Input) |
| Color | Black |
| Product Dimensions (D x W x H) | 12.5"D x 6.3"W x 12.6"H |
| Item Weight | 9.24 Pounds (approx. 4.19 kg) |
| Power Source | Corded Electric |
| Manufacturer | BESTISAN |

Image: Diagram showing the dimensions of the BESTISAN SW65D subwoofer: 12.6 inches in height, 6.3 inches in width, and 12.6 inches in depth.
Warranty Information
The BESTISAN SW65D Powered Subwoofer comes with a Limited Warranty. For specific terms and conditions, including duration and coverage details, please refer to the warranty card included with your product or contact BESTISAN customer support.
Customer Support
For any questions, technical assistance, or warranty claims, please contact BESTISAN customer support. Refer to the contact information provided on the product packaging or the official BESTISAN website.
For more information and product updates, you may visit the official BESTISAN store on Amazon: BESTISAN Store





