Car Audio & 12V Electrical
Subwoofer Wiring & Impedance Calculator
Resolve final ohm loads for SVC and DVC subwoofer arrays so your monoblock stays stable and loud.
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How to Use This Tool
- Select how many subwoofers you are wiring (1–4).
- Choose single voice coil (SVC) or dual voice coil (DVC).
- Set the impedance rating printed on each coil (1Ω, 2Ω, or 4Ω).
- Pick a final load your amplifier is rated to drive continuously.
The Formula & Physics Behind the Math
Parallel coils or subs divide impedance; series connections multiply it. For one DVC sub: parallel coils = ohms ÷ 2, series coils = ohms × 2. For two DVC subs the four common nets are ohms÷4, ohms, ohms, and ohms×4 depending on coil/sub series-parallel combinations.
Frequently Asked Questions
What final ohms should I target?
Match the lowest stable load your amplifier lists (often 1Ω or 2Ω for Class-D monoblocks). Going below the amp’s minimum impedance risks overheating and protection mode.
SVC vs DVC — which is better?
Neither is inherently louder. DVC gives more wiring flexibility to hit 1Ω or 2Ω with multiple subs; SVC is simpler for single-sub installs.
Why is a load below 0.5Ω flagged?
Very low net impedance draws extreme current. Most street amplifiers are not designed for sub-0.5Ω operation and can fail quickly.