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A dual voice coil (DVC) subwoofer has two separate coils on one cone, each with its own pair of terminals. That gives you a choice of final impedance, and the final impedance decides how much power your amplifier sends to the sub. Wire it right and you get every watt you paid for; wire it wrong and you either waste half the amp or push it into a load it can’t handle. Below are the charts for every common combination and the simple rules behind them.
The short version
- Series adds impedances: two 4 Ω coils make 8 Ω.
- Parallel divides them: two 4 Ω coils make 2 Ω.
- One DVC4 sub: 2 Ω or 8 Ω. One DVC2 sub: 1 Ω or 4 Ω.
- Two DVC4 subs: 1 Ω or 4 Ω. Two DVC2 subs: 0.5 Ω, 2 Ω or 8 Ω.
- Pick the lowest load your amp is rated for, then check its power at that load matches the subs’ total RMS.
Try the tool: our subwoofer amp matcher works out the best load and the amp power to look for from your subs’ coils and RMS rating.
The two rules you need
- Series: connect positive to negative in a chain. Impedances add, so 4 Ω + 4 Ω = 8 Ω.
- Parallel: connect positive to positive and negative to negative. With identical coils, divide one coil’s impedance by the number of coils, so two 4 Ω coils give 2 Ω.
Everything below is just those two rules applied twice: first to the coils on each sub, then to the subs themselves. Always use identical subs on one amp so each gets the same share of power.
One DVC subwoofer
| Sub | Coils in series | Coils in parallel |
|---|---|---|
| DVC 1 Ω | 2 Ω | 0.5 Ω |
| DVC 2 Ω | 4 Ω | 1 Ω |
| DVC 4 Ω | 8 Ω | 2 Ω |
Parallel wiring: run a short jumper from coil 1 positive to coil 2 positive and another from coil 1 negative to coil 2 negative. Connect the amp’s positive to either positive terminal and its negative to either negative terminal.
Series wiring: run one jumper from coil 1 negative to coil 2 positive. Connect the amp’s positive to coil 1 positive and its negative to coil 2 negative.
For example, a single Rockford Fosgate P3D4-12 (dual 4 Ω, 600 W RMS) wired in parallel gives 2 Ω, which suits a mono amp that makes 450–600 W at 2 Ω. Our P3D4-12 review covers the sub itself.
Two DVC subwoofers
With two subs you choose how to wire each sub’s coils, then whether to join the two subs in series or parallel. Here are all four options.
| Each sub | Subs joined | Two DVC 1 Ω | Two DVC 2 Ω | Two DVC 4 Ω |
|---|---|---|---|---|
| Series | Series | 4 Ω | 8 Ω | 16 Ω |
| Series | Parallel | 1 Ω | 2 Ω | 4 Ω |
| Parallel | Series | 1 Ω | 2 Ω | 4 Ω |
| Parallel | Parallel | 0.25 Ω | 0.5 Ω | 1 Ω |
The useful results are in the middle two rows and the bottom row. Two Kicker CompR 12s (dual 4 Ω, 500 W RMS each) wired fully in parallel come to 1 Ω and 1,000 W total, which is why we pair them with a 1,000 W at 1 Ω amp in our guide to amps for two 12s. The 16 Ω and 0.25 Ω results are rarely practical: almost no amp makes useful power at 16 Ω, and very few are stable at 0.25 Ω.
Three DVC subwoofers
| Each sub | Subs joined | Three DVC 2 Ω | Three DVC 4 Ω |
|---|---|---|---|
| Series | Parallel | 1.33 Ω | 2.67 Ω |
| Parallel | Parallel | 0.33 Ω | 0.67 Ω |
| Series | Series | 12 Ω | 24 Ω |
Three subs rarely land on a neat number. Three DVC4 subs with each sub in series, then all three in parallel, give about 2.67 Ω, which a 2 Ω-stable amp handles comfortably while making a little less than its 2 Ω rating. Odd counts are easier with single voice coil subs or a different coil impedance, so check the math before you buy.
How to choose the right load
- Add up the RMS. Use the continuous (RMS) rating of each sub, not the peak figure.
- List the loads you can reach. Use the charts above for your sub count and coil impedance.
- Check the amp’s rating at each load. Most mono amps make the most power at their lowest stable load. The Rockford P1000X1bd, for instance, is rated 1,000 W at 1 Ω, 500 W at 2 Ω and 300 W at 4 Ω.
- Pick the load where amp power is 75–100% of total sub RMS. A little more is fine if you set the gain carefully. Our amp sizing guide walks through it.
- Never go below the amp’s minimum. An amp rated down to 2 Ω will overheat or shut down at 1 Ω.
Common pairings
| Your subs | Wire to | Total RMS | Amp that fits |
|---|---|---|---|
| 1 × Rockford P3D4-12 (DVC4, 600 W) | 2 Ω | 600 W | Kicker CXA800.1 (600 W at 2 Ω) |
| 1 × DVC2 sub, 400–500 W | 1 Ω | 400–500 W | A mono amp rated 400–500 W at 1 Ω |
| 2 × Kicker CompR 12 (DVC4, 500 W) | 1 Ω | 1,000 W | Rockford P1000X1bd (1,000 W at 1 Ω) |
| 2 × P3D4-12 (DVC4, 600 W) | 1 Ω | 1,200 W | Rockford R2-1200X1 (1,200 W at 1 Ω) |
| 2 × DVC2 subs, 600 W | 2 Ω | 1,200 W | Kicker CXA1200.1 (1,200 W at 1 Ω or 2 Ω) |
Links to each amp are in our best monoblock amps roundup, including the Kicker CXA800.1 and Kicker CXA1200.1.
Wiring tips that prevent problems
- Connect both coils. Using only one coil leaves half the motor idle, so you lose output.
- Keep polarity consistent. If one sub is wired backwards, the two cones fight each other and bass drops sharply.
- Measure before you power up. A multimeter across the amp’s speaker leads should read close to the target load (a 2 Ω load often reads a little under 2 Ω on a meter, which is normal).
- Use decent speaker wire. 12 AWG copper suits most single-sub installs; 10 AWG for 1,000 W or more on a long run. Our speaker wire gauge calculator sizes it.
- Watch the gain. Clipping kills more subs than power does. See what subwoofer clipping is.
Safety first: disconnect the battery’s negative terminal before you start, fuse the power wire within 18 inches of the battery, and use a professional installer if you’re not comfortable working on your car’s electrics.
FAQs
Is 1 Ω or 4 Ω louder?
With the same amp, the lower load usually gets more power, so 1 Ω is louder if the amp is stable there. The sub itself doesn’t care, as long as it gets no more than its RMS rating.
Can I wire a DVC sub to a 2-channel amp?
Yes, many people bridge a 2-channel amp. Check the amp’s minimum bridged load, which is often 4 Ω, and wire the sub’s coils to match.
What if I mix DVC2 and DVC4 subs?
Don’t. Different impedances get different amounts of power, so one sub works harder than the other.
Does a sealed or ported box change the wiring?
No. The box changes how the sub sounds, not its impedance. Our sealed vs ported guide covers the box choice.