Wiring a dual voice coil subwoofer correctly is the foundational step to unlocking its full potential in any audio setup. Unlike a standard subwoofer, a DVC unit provides twice the flexibility by offering two separate voice coils, which can be wired in series or parallel to match your amplifier's impedance. This versatility allows you to optimize power delivery and control the overall load, ensuring the sub performs efficiently without straining your equipment. The process itself is straightforward, but it demands attention to detail to avoid phase cancellation or incorrect impedance loads that can damage your gear.
Understanding Dual Voice Coil Subwoofers
Before diving into the wiring diagrams, it is essential to understand what makes a DVC subwoofer unique. Each subwoofer cone is attached to its own voice coil, and these coils are wired together internally but function as independent magnetic circuits. This design allows you to treat the sub as two separate units in one enclosure, giving you the ability to customize the impedance load. The primary advantage is flexibility; you can wire the coils to present a 2-ohm, 4-ohm, or 8-ohm load to your amplifier, depending on your specific goals and equipment capabilities.
Determining Your Target Impedance
The first practical step in the wiring process is to check your amplifier or receiver's specifications. You need to determine the stable impedance range your amp can handle without overheating or shutting down. Most modern amplifiers are stable at 4 ohms, but some high-power units can manage 2 ohms or even lower. If your amplifier is 4-ohm stable, wiring the DVC sub in parallel might be the ideal choice to utilize its full power output. Conversely, if you have an older or lower-powered amp, wiring in series to achieve an 8-ohm load might be the safer and more stable option.
Series Wiring for Higher Impedance
Wiring the voice coils in series is the method used to double the impedance of the subwoofer. In this configuration, you connect the positive terminal of your amplifier to the positive terminal of the first coil, and then you connect the negative terminal of that coil to the positive terminal of the second coil. Finally, you connect the negative terminal of the second coil to the negative terminal of the amplifier. This effectively adds the resistance of the two coils together, resulting in a total impedance that is the sum of both coils. If each coil is 4 ohms, the sub will present an 8-ohm load to the amplifier.
Parallel Wiring for Lower Impedance
Parallel wiring is the most common method for maximizing power transfer, as it reduces the total impedance load. To wire the coils in parallel, you connect both positive terminals of the voice coils together and then connect them to the positive terminal of the amplifier. Similarly, you connect both negative terminals together and run them to the negative terminal of the amplifier. This configuration lowers the impedance, allowing the amplifier to push more current and deliver higher sound pressure levels. However, this places a heavier burden on the amplifier, so ensuring your receiver can handle the lower load is critical to system longevity.
Reading the Wiring Diagram
On the back of your dual voice coil subwoofer, you will find four distinct terminals: positive and negative for coil A, and positive and negative for coil B. It is vital to use a wiring diagram specific to your component to avoid mistakes. A visual reference helps clarify whether you are creating a series circuit or a parallel circuit. Misconnecting these terminals, such as bridging a positive to a negative incorrectly, can result in the coils canceling each other out, leading to weak bass or even burning out the voice coils due to excessive heat.
