Rockville: Pair 4-Ohm DVC Subwoofer Wiring

Introduction

This guide explains the different wiring configurations for two dual voice coil (DVC) 4-ohm subwoofers. We’ll walk you through step-by-step instructions on how to wire your subs in parallel, series-parallel, and series, as well as explain which amplifiers work best with each setup. These instructions are beginner-friendly and require only basic tools like speaker wire and a multimeter.

Requirements:

• Two DVC 4-ohm subwoofers
• Jumper cables or speaker wire
• A compatible subwoofer enclosure with terminal connections
• A compatible amplifier (as indicated below)
• A multimeter (recommended for checking impedance)

Step 1: Check Voice Coil Impedance

• Use a multimeter to test each terminal on your subwoofers.
• Each voice coil should read close to 4 ohms (often around 4.1 ~ 4.2 ohms).
• This ensures both subs are functioning correctly before wiring.

Step 2: Wiring Options

Option A → Parallel-Parallel Wiring (Final Load ≈ 1 Ohm)
This is the most common configuration for maximum power when using a 1-ohm stable amplifier.

1. Connect all positive terminals together:
   • Positive to positive across both subs.
   • Connect the final positive lead to the enclosure’s positive input.
2. Connect all negative terminals together:
   • Negative to negative across both subs.
   • Connect the final negative lead to the enclosure’s negative input.
3. Testing with a multimeter at the enclosure terminals should read should be about 1 ~ 1.1 ohms.

Recommended Use: Works best with a 1-ohm stable (or 0.5 ohm) monoblock amplifier.
⚠️Do not use with a 2-ohm (or 4-ohm) stable amplifier, as it may cause the amp to enter protect mode, in addition to blown fuses and/or internal damage.

Option B → Series-Parallel Wiring (Final Load ≈ 4 Ohms)
This allows for use with a bridged output from a multi-channel amplifier.

1. Connect each subwoofer’s voice coils in series:
   • Connect the positive terminal of one voice coil to the negative terminal of the other voice coil(on the same sub).
   • Do this for both subwoofers.
   • You should not have any wires connecting from one subwoofer to the other yet.
2. Connect the subwoofers together in parallel:
   • Take the remaining / unused positive terminals from each sub and connect them together.
   • Take the remaining / unused negative terminal from each sub and connect them together.
3. Connect to the enclosure box:
   • Combined positive(from either sub) goes to the positive terminal on the enclosure box.
     *Be sure to use one of the positive terminals linked to the other sub's positive terminal(not one that is linked to its own negative terminal).
   • Combined negative(from either sub) goes to the negative terminal on the enclosure box.
     *Be sure to use one of the negative terminals linked to the other sub's negative terminals(not one that is linked to its own positive terminal).
4. Testing with a multimeter at the enclosure terminals should read should be about 4 ~ 4.2 ohms total impedance.

Recommended Use:  2-channel amplifier in bridge mode / wiring setup
Recommended Use:  2-ohm stable monoblock amplifier, providing desired output at 4 ohms.

Dual Terminal Enclosure Wiring:

• Some dual enclosures and mono amplifiers have multiple terminal sets.
• Mono sub amplifiers will also often have multiple terminal sets (internally connected).

Dual Terminal Wiring → Separate Parallel/Parallel Configuration (Final Load ≈ 1 Ohm)

1. Wire each sub (positive to positive, negative to negative) in parallel inside the enclosure as shown above in Option A – Part 1.
2. Connect a set of positive and negative terminals from one sub to the nearest enclosure terminal (positive to red / negative to black).
3. Connect a set of positive and negative terminals from the other sub to the other enclosure terminal (positive to red / negative to black).
4. Connect each of the enclosure’s wire terminals to each of the amplifier's output terminals (positive to positive, negative to negative).
5. The amplifier will parallel the signals internally, resulting in a 1-ohm final load.

Dual Terminal Wiring → Separate Series-Parallel Wiring (Final Load ≈ 4 Ohms)

1. Wire each sub positive to negative in sequence across both coils as shown above in Option B – Part 1.
2. Connect the unused positive and negative terminal from one sub to the nearest enclosure terminal (positive to red / negative to black).
3. Connect the unused positive and negative terminal from the other sub to the other enclosure terminal (positive to red / negative to black).
4. Connect each of the enclosure’s wire terminals to each of the amplifier's output terminals (positive to positive, negative to negative).
5. The amplifier will parallel the signals internally, resulting in a 4-ohm final load.

Troubleshooting & FAQs

Q: My multimeter is over by 0.1 or 0.2 ohms, is that okay?
Yes, readings are often slightly different (usually higher) than advertised due to coil resistance tolerances. These readings can often be 0.1 or 0.2 ohms higher than the exact number calculated.

Q: My amp keeps going into protect mode. Why?
You may be wired in parallel-parallel at 1 ohm while using a 2-ohm stable amplifier. Rewire to series-parallel for a safer 4-ohm load.

Q: Why is my system not as loud as expected?
Your subs may be wired in series-series (16 ohm load), reducing power delivery. Switch to series-parallel or parallel-parallel(is using 1-ohm stable amp).

Q: Which wiring gives the most output, or loudest bass?
Parallel wiring at 1 ohm generally gives the most output but requires a 1-ohm stable amplifier.

Q: Can I damage my amp if I wire incorrectly?
Yes. Always check the amp’s minimum impedance rating before wiring. Never run an amp below its rated impedance.

Conclusion

When wiring two DVC (Dual Voice Coil) 4-ohm subwoofers, the best configuration depends on your amplifier:

• Parallel-Parallel (1 ohm) → For 1-ohm stable monoblock amps.
• Series-Parallel (4 ohm) → For 2-channel bridged amps or 2-ohm stable monoblocks.

We highly recommend that you double-check your wiring with a multimeter and make sure your amp is compatible with the final load.