Subwoofers

Car Audio Subwoofers

• What is the difference between an "Active" and a "Passive" subwoofer?

  This is the first crossroad for every buyer:

  • Active (Powered): The amplifier is built directly into the subwoofer enclosure. These are compact, easier to install, and great for saving space (like under a seat).
  • Passive: This is just the speaker in a box. It requires an external, aftermarket amplifier to provide power. This setup is for those who want maximum volume and customization.
• Should I get a 10-inch or a 12-inch subwoofer?

  Size affects the "character" of the bass more than just the volume:

  • 8" or 10": These are "faster" and more responsive. They excel at tight, punchy bass found in rock, metal, or country. They also take up less trunk space.
  • 12" or 15": These move more air and can hit lower frequencies. If you listen to Hip-Hop, EDM, or cinematic scores and want to feel the vibration, these are the better choice.
• What is the difference between a Sealed and a Ported box?

  The enclosure (the box) is just as important as the speaker itself:

  • Sealed Enclosure: An airtight box. It provides the most accurate and tight bass. If you want your music to sound exactly as the artist intended, go sealed.
  • Ported (Vented) Enclosure: A box with a port (vent) to redirect sound from the back of the cone. It is significantly louder and more efficient, making it ideal for "head-turning" bass.
• Do I need a capacitor for my subwoofer?

  You might have seen lights dimming when a bass hit occurs.

  • A capacitor acts as a small battery reserve to help with those quick hits.
  • Reality Check: If your lights are dimming significantly, a capacitor is often just a "band-aid." You likely need a "Big 3" wiring upgrade or a higher-output alternator to actually solve the power drain.
• What does Dual Voice Coil (DVC) mean?

  Standard speakers have one voice coil (two terminals). DVC subwoofers have two separate coils, each with its own set of terminals.

  • The Benefit: It gives you more wiring flexibility. You can wire them in parallel or series to match the Ohm load your amplifier requires (e.g., dropping to 1 ohm for maximum power or staying at 4 ohms for stability).
• Can I keep my factory radio and still add a sub?

  Yes, but you will need a Line Output Converter (LOC). This device taps into your existing rear speaker wires and converts that signal into an RCA connection that your subwoofer's amplifier can understand.

• How do I match a subwoofer with an amplifier?

  To match a car subwoofer with an amplifier, you must align the RMS power ratings and the impedance (Ohms). Start by looking at the subwoofer’s RMS rating—not the "peak" or "max" power—and find an amplifier that can provide 75% to 150% of that wattage for a clean, undistorted signal.

  Next, you must ensure the amplifier is stable at the subwoofer's final impedance; for example, if you have a Dual 4 ohms subwoofer wired in parallel to 2 ohms, you need an amplifier that explicitly lists its power output at a 2 ohms load. Ideally, choose a Class D monoblock amplifier, as these are specifically designed to handle low-frequency demands efficiently while providing the necessary tuning controls, like a subsonic filter, to protect your sub from over-excursion.