How To Hook Subs Up To A Stock Radio

So, you want to add some serious bass to your car without replacing your factory stereo? You're not alone! Many people want to keep the original look and functionality of their stock radio while upgrading the sound system. The good news is, connecting a subwoofer to a stock radio is definitely possible. This article will guide you through the process, explaining why it's worthwhile, what to consider, and how to do it safely and effectively.

Why Add a Subwoofer to a Stock Radio?

Modern car audio systems, even "premium" ones, often fall short when it comes to low-end frequencies. That deep, rumbling bass that you feel in your chest is usually missing. Here's why adding a subwoofer makes such a difference:

• Enhanced Sound Quality: A subwoofer fills out the lower frequencies, creating a much fuller and more balanced sound. This allows you to hear details in your music that you might have been missing.
• Reduced Strain on Existing Speakers: By offloading the bass frequencies to the subwoofer, your existing speakers don't have to work as hard. This can improve their clarity and longevity, and may even allow you to crank up the volume without distortion.
• Improved Listening Experience: A well-integrated subwoofer transforms your driving experience, making your music more engaging and enjoyable. From classical music to hip-hop, everything sounds better with deep, rich bass.
• Maintain Factory Aesthetics: Keeping your stock radio maintains the original look and feel of your car's interior. This is especially important for classic cars or vehicles where the factory radio is integrated with other vehicle systems.
• Cost Savings: In many cases, adding a subwoofer is cheaper than replacing the entire head unit and all the speakers.

How to Choose the Right Components for Integration

Successfully hooking up a sub to your stock radio requires careful planning and selecting the right equipment. Here are the key considerations:

1. Line Output Converter (LOC)

This is the most crucial component. Your stock radio likely doesn't have RCA outputs (the standard connection for aftermarket amplifiers). An LOC converts the high-level speaker signals from your stock radio into low-level RCA signals that your amplifier can use.

Choosing the right LOC is critical:

• Quality Matters: Don't skimp on the LOC. A cheap LOC can introduce noise and distortion. Look for models from reputable brands known for clean signal conversion.
• Number of Channels: Determine how many channels you need. If you are adding a single subwoofer, a two-channel LOC is usually sufficient. If you plan to add multiple subs or upgrade other speakers later, consider a four-channel LOC.
• Adjustable Gain: An LOC with adjustable gain allows you to fine-tune the signal strength to match your amplifier's input sensitivity. This is important for optimizing sound quality and preventing clipping (distortion).
• Remote Turn-On Wire: Some LOCs include a remote turn-on wire, which is essential for automatically turning on your amplifier when the radio is powered on. This is a significant convenience and prevents you from having to manually switch on the amplifier every time you drive.

2. Subwoofer

Choosing a subwoofer involves considering size, power handling, and enclosure type.

• Size: Subwoofers typically range from 8 to 15 inches. Smaller subs (8-10 inches) are ideal for smaller cars or those who prefer a more subtle bass enhancement. Larger subs (12-15 inches) deliver more powerful and deeper bass.
• Power Handling: Match the subwoofer's RMS power rating to the amplifier's output. It's better to have a slightly more powerful subwoofer than amplifier to avoid overpowering the sub.
• Enclosure Type: The enclosure significantly impacts the subwoofer's sound.
  • Sealed Enclosures: Offer accurate and tight bass. They are typically smaller and easier to install.
  • Ported Enclosures: Provide louder and deeper bass but are generally larger and require more tuning.
  • Bandpass Enclosures: Offer very loud bass in a narrow frequency range. These are less common for general music listening.
  • Powered Subwoofers: Many powered subwoofers come pre-enclosed with a built-in amplifier. These are a convenient option for simplifying installation.

3. Amplifier

The amplifier powers your subwoofer. Choose an amplifier with an RMS power rating that matches or slightly exceeds your subwoofer's power handling capabilities.

• Mono Amplifier: Dedicated to powering subwoofers. They are designed to deliver high power to a single channel.
• Multi-Channel Amplifier: Can power multiple speakers, including a subwoofer. Useful if you plan to upgrade other speakers in the future.
• Class D Amplifier: Most efficient type of amplifier, ideal for car audio due to its lower power consumption and heat generation.

4. Wiring Kit

A wiring kit provides all the necessary cables and connectors to connect your amplifier to the car's power source and ground.

• Power Wire: Should be thick enough to handle the amplifier's current draw. Consult the amplifier's manual for the recommended gauge.
• Ground Wire: Should be the same gauge as the power wire. Connect to a solid, unpainted metal surface on the car's chassis.
• Remote Turn-On Wire: Connects to the LOC or radio's remote turn-on output (if available) to signal the amplifier to turn on.
• RCA Cables: Connect the LOC's output to the amplifier's input.
• Speaker Wire: Connects the amplifier's output to the subwoofer.
• Fuse Holder and Fuse: Protects the amplifier and car's electrical system from short circuits.

Real-World Owner Experiences

Many car owners have successfully added subwoofers to their stock radios. Here are some common experiences:

• Improved Soundstage: "I was amazed at how much better my music sounded after adding a subwoofer. It filled in the low end and made the entire soundstage much more immersive."
• Clean Bass: "I was worried about distortion, but with a quality LOC and proper tuning, the bass is clean and tight."
• Easy Installation (Sometimes!): "The installation was relatively straightforward. I followed the instructions carefully and took my time." (Note: Some installations can be more complex depending on the car and radio).
• Integration Challenges: "Finding the right spot to tap into the speaker wires was tricky in my car. I had to consult the car's wiring diagram."
• Remote Turn-On Issues: "My LOC didn't have a remote turn-on wire, so I had to find an accessory power source to trigger the amplifier."

These experiences highlight the importance of research, careful planning, and using quality components. If you're not comfortable with electrical work, consider having a professional install the system.

Frequently Asked Questions (FAQs)

Here are some common questions about connecting subwoofers to stock radios:

Q: Will adding a subwoofer void my car's warranty?

A: Generally, adding an aftermarket stereo component should not void your entire car warranty. However, if the installation causes damage to the car's electrical system, that specific damage may not be covered. It's always a good idea to check with your dealership or warranty provider to be sure.

Q: Where should I tap into the speaker wires?

A: The best location depends on your car model. Common locations include behind the radio, in the door panels, or at the factory amplifier (if equipped). Consult your car's wiring diagram or a professional installer for the best and safest location.

Q: How do I tune the amplifier?

A: Tuning an amplifier involves setting the gain, crossover frequency, and bass boost (if available). Start by setting the gain to the minimum and gradually increase it until you hear distortion. Adjust the crossover frequency to blend the subwoofer with your existing speakers. Avoid using bass boost, as it can introduce distortion. A digital multimeter and oscilloscope can greatly aid in proper tuning.

Q: Can I use any LOC with any stock radio?

A: While most LOCs are compatible with a wide range of stock radios, some newer vehicles with complex audio systems may require specialized LOCs that are specifically designed to work with those systems. These vehicles often have features like active noise cancellation or digitally processed audio signals. Consult with a car audio specialist to determine if your vehicle requires a specific LOC.

Q: Is it better to use front or rear speaker wires for the LOC?

A: This depends on your preference and the characteristics of your stock radio. Using the front speaker wires will generally provide a fuller range of frequencies, especially if your rear speakers are only playing mid-range or high frequencies. Experiment with both options to see which sounds best to you.

Q: What if my stock radio doesn't have a remote turn-on wire?

A: If your LOC doesn't provide a remote turn-on and your stock radio lacks a dedicated remote output, you can use an "add-a-fuse" to tap into an accessory power source in your fuse box. This will turn on the amplifier when the car's ignition is on.

By carefully considering these factors and following these guidelines, you can successfully add a subwoofer to your stock radio and enjoy a significantly enhanced listening experience in your car.