Skar Audio SKM8WD4 8-Inch Dual 4 Ohm Marine Subwoofer Instruction Manual

1. Overview

The Skar Audio SKM8WD4 is an 8-inch marine-grade subwoofer designed for robust performance in challenging environments. It features a dual 4-ohm voice coil configuration, delivering 500 Watts of peak power and 250 Watts RMS. Constructed with durable materials, this subwoofer is built to withstand marine conditions while providing powerful and clear bass.

Figure 1: Front view of the Skar Audio SKM8WD4 8-inch marine subwoofer.

2. Product Features

• 8-Inch Dual 4 Ohm Marine Subwoofer: Designed specifically for marine applications.
• Power Handling: 500 Watts Peak Power / 250 Watts RMS Power.
• Voice Coil: 2.0" (50.8mm) Dual 4-ohm High Temperature Copper Voice Coil for reliable performance.
• Frequency Response: 51 Hz - 300 Hz, providing deep and impactful bass.
• Sensitivity: 84.5 dB, ensuring efficient power conversion to sound.
• Motor Structure: High Flux Ferrite Motor for strong magnetic field and precise cone control.
• Surround: High Roll Rubber Surround for enhanced excursion and durability.
• Material: Constructed from durable plastic and rubber, suitable for marine environments.
• Water Resistance: IP67 Waterproof rating, salt fog resistant, and UV protected.

3. What's in the Box

• 1 x Skar Audio SKM8WD4 8-Inch Marine Subwoofer
• 1 x Mounting Gasket
• Mounting Screws (Stainless Steel)

Figure 2: Included mounting gasket and stainless steel screws.

4. Setup and Installation

Proper installation is crucial for optimal performance and longevity of your marine subwoofer. Ensure all connections are secure and waterproof to prevent damage from moisture.

4.1 Mounting Location

Choose a mounting location that provides adequate air space for the subwoofer (if not using a sealed enclosure) and is structurally sound. The subwoofer is designed for marine applications and can be mounted in areas exposed to moisture, but direct submersion should be avoided. Consider areas like boat benches or panels that offer some form of enclosure.

4.2 Mounting Procedure

1. Prepare the Opening: Use the provided cutting template (if available, or refer to the dimensions in the specifications section) to mark and cut the mounting hole. Ensure the hole is clean and free of debris.
2. Apply Gasket: Place the mounting gasket around the subwoofer's frame to create a seal between the subwoofer and the mounting surface.
3. Secure Subwoofer: Insert the subwoofer into the mounting hole. Align the screw holes and use the provided stainless steel screws to secure the subwoofer. Do not overtighten the screws to avoid damaging the frame.

Figure 3: Subwoofer dimensions for accurate mounting.

5. Wiring Diagram

The SKM8WD4 features a dual 4-ohm voice coil. Proper wiring is essential to match the impedance requirements of your amplifier. Consult your amplifier's manual for recommended wiring configurations (series, parallel, or independent) to achieve the desired impedance (e.g., 2 ohms or 8 ohms for a dual 4-ohm subwoofer).

5.1 Connecting to Amplifier

1. Identify Terminals: Locate the positive (+) and negative (-) terminals on the subwoofer. The terminals are designed for wired connectivity.
2. Connect Wires: Use appropriate gauge marine-grade speaker wire. Connect the positive terminal of the subwoofer to the positive output of your amplifier and the negative terminal of the subwoofer to the negative output of your amplifier, following your chosen wiring configuration.
3. Secure Connections: Ensure all wire connections are tight and free from corrosion. Use marine-grade connectors and heat shrink tubing for added protection against moisture.

Figure 4: Close-up of the subwoofer's wired terminals.

6. Operating Instructions

Once installed and wired correctly, your Skar Audio SKM8WD4 subwoofer is ready for operation. Ensure your amplifier is powered on and connected to your audio source.

6.1 Initial Playback

1. Start with Low Volume: Begin playing audio at a low volume level.
2. Adjust Amplifier Settings: Gradually increase the volume and adjust any amplifier settings (gain, crossover, bass boost) to achieve desired sound quality without distortion.
3. Listen for Distortion: If you hear any distortion, reduce the volume or adjust amplifier settings immediately to prevent damage to the subwoofer.

7. Maintenance

To ensure the longevity and optimal performance of your marine subwoofer, regular maintenance is recommended.

• Regular Cleaning: Wipe down the subwoofer grille and cone with a damp cloth to remove salt, dirt, and debris. Avoid using harsh chemicals or abrasive cleaners.
• Inspect Connections: Periodically check all wiring connections for corrosion or looseness. Tighten any loose connections and clean any signs of corrosion.
• UV Protection: While the subwoofer is UV protected, prolonged exposure to direct sunlight can still affect its appearance over time. Consider using a cover when the boat is not in use.
• Winterization: If storing your boat for the winter, ensure the subwoofer is clean and dry. Store in a climate-controlled environment if possible.

8. Troubleshooting

If you experience issues with your subwoofer, refer to the following troubleshooting tips:

• No Sound:
  • Check all wiring connections (power, ground, signal, speaker wires) for proper contact and polarity.
  • Ensure the amplifier is powered on and receiving a signal from the audio source.
  • Verify that the amplifier's gain and crossover settings are correctly configured.
• Distorted Sound:
  • Reduce the amplifier's gain setting.
  • Check for damaged speaker wires or loose connections.
  • Ensure the subwoofer is not overdriven (volume too high for its power rating).
• Intermittent Sound:
  • Inspect all connections for intermittent contact due to corrosion or loose terminals.
  • Check for any short circuits in the wiring.

9. Specifications

10. Warranty and Support

The Skar Audio SKM8WD4 marine subwoofer comes with a Limited Warranty. For specific details regarding warranty coverage, duration, and claims process, please refer to the warranty card included with your product or visit the official Skar Audio website. For technical support, troubleshooting assistance, or any other inquiries, please contact Skar Audio customer service.