1. Introduction
The Sound Ordnance B-8PTD is a compact 8-inch powered subwoofer designed to enhance the bass response in your vehicle's audio system. This unit integrates a 125-watt RMS Class D amplifier and an 8-inch aluminum cone subwoofer within a durable ABS plastic enclosure. Its all-in-one design simplifies installation by eliminating the need for separate components, making it suitable for installations where space is limited, such as under a car seat or in a truck cab. The B-8PTD features adjustable controls including a low-pass filter, variable phase control, and bass boost, allowing for precise audio tuning. It supports both preamp-level (RCA) and speaker-level inputs for compatibility with various car audio systems, including factory stereos.
2. Setup and Installation
Proper installation is crucial for optimal performance and safety. Ensure the vehicle's battery is disconnected before beginning any wiring.
2.1 Mounting Location
Select a secure and dry location for mounting the subwoofer. Common locations include under a seat or in an out-of-the-way area within the vehicle's cabin. Ensure adequate ventilation around the unit.
2.2 Wiring Connections
The B-8PTD offers multiple input options. Refer to the diagram below for connection points.
Figure 1: Rear view of the Sound Ordnance B-8PTD powered subwoofer showing the control panel and input/output connections. This image displays the power terminals (GND, REM, +12V), fuse, RCA level inputs (L, R), high power inputs (CH1+, CH1-, CH2+, CH2-), and the remote level control port.
Power Connections:
- GND (Ground): Connect this terminal to a clean, unpainted metal surface of the vehicle chassis. Ensure a solid electrical connection.
- REM (Remote Turn-On): Connect this terminal to the remote turn-on lead from your head unit. This wire signals the subwoofer to turn on and off with your car's audio system.
- +12V (Power): Connect this terminal directly to the positive terminal of your vehicle's battery. An in-line fuse (15A, as indicated on the unit) should be installed within 18 inches of the battery connection for protection.
Audio Input Connections:
- Level Input (RCA): For head units with RCA preamp outputs, connect RCA cables from the head unit's subwoofer or full-range outputs to the L and R RCA inputs on the B-8PTD.
- High Power Input (Speaker Level): If your head unit does not have RCA outputs, use the included speaker-level input harness. Connect the speaker wires from your head unit's speaker outputs to the corresponding CH1+, CH1-, CH2+, CH2- terminals on the subwoofer.
Remote Level Control:
Connect the wired remote level control to the "REMOTE LEVEL" port. This allows for convenient adjustment of the subwoofer's output level from the driver's seat.
Figure 2: Top-down view of the Sound Ordnance B-8PTD powered subwoofer, illustrating its compact size and the wired remote level control connected to the unit. The remote allows for easy adjustment of bass output.
3. Operation and Adjustments
After installation, fine-tune the subwoofer's settings to integrate it seamlessly with your vehicle's audio system.
3.1 Initial Setup
- Turn the gain control (Level Input) on the subwoofer to its minimum setting.
- Set the bass boost to its minimum.
- Play a piece of music with strong bass content through your car's audio system.
- Slowly increase the gain control on the subwoofer until the bass blends well with the rest of your system without distortion.
3.2 Controls
- Low-Pass Filter (LPF): This control sets the upper frequency limit for the subwoofer. Adjust it to blend the subwoofer's output with your main speakers. A common starting point is 80-100 Hz.
- Variable Phase Control: This control adjusts the phase of the subwoofer's output relative to your main speakers. Adjust it to achieve the most impactful and cohesive bass response. Listen for the strongest bass output at your listening position.
- Bass Boost: This control provides an adjustable boost to specific low frequencies. Use sparingly to avoid distortion.
- Remote Level Control: This external knob allows for convenient, on-the-fly adjustment of the subwoofer's output level from the driver's seat.
4. Maintenance
The Sound Ordnance B-8PTD is designed for durability and requires minimal maintenance.
- Cleaning: Use a soft, dry cloth to wipe down the exterior of the unit. Avoid using harsh chemicals or abrasive cleaners.
- Connections: Periodically check all wiring connections to ensure they are secure and free from corrosion.
- Environment: Ensure the subwoofer is not exposed to excessive moisture or extreme temperatures, which can affect its performance and lifespan.
5. Troubleshooting
If you experience issues with your B-8PTD subwoofer, consult the following troubleshooting guide before seeking professional assistance.
| Symptom | Possible Cause | Solution |
|---|---|---|
| No Sound |
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| Distorted Sound |
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| Weak or Muffled Bass |
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6. Specifications
| Model Number | B-8PTD |
| Speaker Type | Powered Woofer |
| Woofer Diameter | 8 Inches |
| Built-in Amplifier Power | 125 Watts RMS (Class D) |
| Enclosure Material | ABS Plastic |
| Inputs | Preamp-level (RCA), Speaker-level |
| Controls | Low-Pass Filter, Variable Phase Control, Bass Boost, Remote Level Control |
| Included Accessories | Wired remote control, cables |
| Specific Uses For Product | Vehicle Audio Enhancement |
7. Warranty Information
The Sound Ordnance B-8PTD powered subwoofer comes with a Limited Warranty. For specific details regarding warranty coverage, duration, and terms, please refer to the warranty card included with your product or visit the official Sound Ordnance website. Retain your proof of purchase for warranty claims.
8. Customer Support
For technical assistance, installation questions, or troubleshooting support, please contact Crutchfield customer service. Crutchfield provides dedicated support for Sound Ordnance products.
You can typically find contact information for Crutchfield on their official website or through the retailer where you purchased the product.