Introduction
The Scosche HD6904A-WM1SD 6x9 4-Way Full Range Car Door Speakers are designed to enhance your vehicle's audio system with clear and powerful sound. Featuring a durable polypropylene cone, rubber surround, and strontium magnets, these speakers deliver a balanced audio experience with deep bass, smooth mid-range, and brilliant highs. This manual provides essential information for proper installation, operation, and maintenance to ensure optimal performance and longevity of your speakers.

Image: Scosche HD6904A-WM1SD speaker highlighting its premium sound quality features, including 300 Watts Peak and 75 Watts RMS power handling, CEA-2031 compliance, and strontium magnets for powerful bass.
What's in the Box
Verify that all components are present before beginning installation.
- 2 x HD Speakers
- 2 x Speaker Grilles
- Mounting Hardware

Image: Visual representation of the package contents, showing the two HD speakers, two speaker grilles, and the included mounting hardware.
Specifications
| Feature | Detail |
|---|---|
| Brand | Scosche |
| Model Number | HD6904A-WM1SD |
| Speaker Type | Coaxial, 4-Way Full Range |
| Speaker Size | 6" x 9" |
| Woofer Diameter | 6 inches |
| Midrange | 2.3 inches |
| Tweeters | 0.7 inch dual tweeters |
| Maximum Output Power | 300 Watts |
| RMS Power | 75 Watts (per speaker) |
| Voice Coil | 1" Copper Wound |
| Cone Material | Injection-Molded Polypropylene (IMPP) |
| Surround Material | Rubber |
| Magnet Type | Strontium |
| Mounting Type | Flush Mount |
| Enclosure Material | Plastic |
| Item Weight | 5.2 pounds (per pair) |
| Item Dimensions (D x W x H) | 5.94"D x 8.7"W x 3.48"H |
| Cutout Dimension | 5.94" x 8.70" |
| Mounting Depth | 2.7" |
| Color | Black |
| Water Resistance Level | Not Water Resistant |

Image: Detailed dimensions of the 6x9 speaker, including mounting depth and cutout measurements for installation planning.
Setup and Installation
Proper installation is crucial for optimal speaker performance and vehicle safety. If you are unsure about any steps, it is recommended to seek professional assistance.
Safety Precautions:
- Disconnect the vehicle's battery before starting any electrical work.
- Wear appropriate safety gear, including eye protection.
- Ensure all wiring is properly insulated and secured to prevent short circuits.
- Do not obstruct any vehicle safety features or mechanisms during installation.
General Installation Steps:
- Remove Existing Speakers: Carefully remove the door panel or rear deck cover to access the factory speakers. Disconnect the wiring and remove the old speakers.
- Prepare Mounting Location: Ensure the mounting location is clean and free of debris. The optimized frame design of the HD6904A-WM1SD allows for a direct fit in most 6x9 factory locations. If necessary, use the provided mounting hardware or adapter plates for a secure fit.
- Connect Wiring: Connect the speaker wires from your vehicle's audio system to the terminals on the new Scosche speakers. Ensure correct polarity (positive to positive, negative to negative) for proper sound reproduction.
- Mount New Speakers: Securely fasten the new speakers into the prepared mounting location using the provided screws and clips. Ensure the speakers are flush-mounted and stable.
- Install Grilles: Attach the included speaker grilles over the installed speakers.
- Reassemble Vehicle Interior: Reinstall the door panels or rear deck covers, ensuring all clips and screws are properly secured.
- Reconnect Battery: Reconnect the vehicle's battery.
- Test Audio System: Turn on your car's audio system and test the new speakers to ensure they are functioning correctly and producing clear sound.
Video: Official Scosche Speaker Installation Instructions. This video provides a visual guide on how to connect wiring and mount new speakers in a vehicle.

Image: Detailed view of the 6x9 HD speaker set, highlighting the woofer, midrange, and dual tweeters, and indicating compatibility with most car models.

Image: Illustration of the 4-way speaker technology, emphasizing the polypropylene cone, sound quality (deep bass, smooth mids, brilliant highs), multi-fit frame, and strontium magnet.
Operating Instructions
Once installed, the Scosche HD6904A-WM1SD speakers operate as part of your vehicle's existing audio system. No specific controls are on the speakers themselves.
- Power On/Off: The speakers will power on and off with your vehicle's head unit or amplifier.
- Volume Control: Adjust the volume using your car's head unit controls.
- Audio Settings: Utilize your head unit's equalizer, balance, and fader controls to fine-tune the sound to your preference. The 4-way design provides a full range of sound, allowing for detailed adjustments.
- Source Selection: Select your desired audio source (radio, CD, Bluetooth, etc.) through your car's head unit.
Maintenance
To ensure the longevity and optimal performance of your Scosche HD6904A-WM1SD speakers, follow these simple maintenance guidelines:
- Cleaning: Periodically wipe the speaker grilles and surrounds with a soft, dry cloth to remove dust and debris. Avoid using harsh chemicals or abrasive cleaners, as these can damage the speaker components.
- Inspection: Occasionally inspect the speaker cones and surrounds for any signs of damage, such as tears or cracks. Ensure all mounting screws remain tight.
- Environmental Factors: While the speakers are built for durability, they are not water-resistant. Avoid exposing them to excessive moisture or extreme temperatures.
- Power Levels: Avoid consistently playing audio at maximum volume levels for extended periods, as this can lead to speaker fatigue and potential damage.
Troubleshooting
If you encounter issues with your speakers, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No Sound from Speakers | Loose wiring connection Incorrect polarity Head unit or amplifier issue Damaged speaker wire | Check all speaker wire connections at both the speaker and head unit/amplifier. Verify positive and negative connections are correct. Test head unit/amplifier with another speaker or audio output. Inspect speaker wires for cuts or breaks; replace if necessary. |
| Distorted Sound | Volume too high Incorrect audio settings Damaged speaker cone/surround Insufficient power from head unit/amplifier | Reduce volume level. Adjust equalizer, bass, and treble settings on your head unit. Inspect speaker for physical damage; if damaged, replacement may be necessary. Consider adding an external amplifier for more power. |
| Intermittent Sound | Loose wiring connection Faulty speaker wire | Check and secure all wiring connections. Replace speaker wire if it appears damaged. |
| One Speaker Not Working | Faulty speaker wire Damaged speaker Incorrect fader/balance settings | Swap speaker wires with a working speaker to diagnose. If speaker is confirmed faulty, it may need replacement. Check fader and balance settings on your head unit. |
Warranty Information
The Scosche HD6904A-WM1SD speakers come with a Limited 1-Year Warranty. This warranty covers defects in materials and workmanship under normal use. Please retain your proof of purchase for warranty claims. For specific terms and conditions, refer to the official Scosche warranty documentation or contact customer support.
Support
For further assistance, technical support, or warranty inquiries, please contact Scosche customer service:
- Website: Visit the official Scosche website for FAQs, product registration, and support resources.
- Contact: Refer to the contact section on the Scosche website for phone numbers or email support.
Always provide your product model number (HD6904A-WM1SD) and proof of purchase when seeking support.





