Rockville: Pair 2-Ohm DVC Subwoofer Wiring

Introduction

This guide will walk you through wiring configurations for two dual voice coil (DVC) 2-ohm subwoofers. We’ll cover series-parallel wiring and parallel wiring, explain the resulting impedance, and provide important safety notes to protect your subs and amplifier. The steps are simple and easy to follow, even if you have little technical experience.

Requirements:

• Two DVC 2-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 2 ohms (often around 2.1 ~ 2.2 ohms).
• This ensures both subs are functioning correctly before wiring.

Step 2: Wiring the Subs / Voice Coils

Option A → Series-Parallel Wiring (Final Load ≈ 2 Ohms)
This is the most common and recommended method.

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 2 ~ 2.2 ohms total impedance.

Applications:

• Works with 2-ohm stable mono amplifiers.
• Also works with 1-ohm stable amplifiers running with desired output at 2 ohms (also known for providing cooler operation, better efficiency and improved sound quality).

Option B →  Parallel-Parallel Wiring (Final Load ≈ 0.5 Ohm)
⚠️ Warning: Only use this method if your amplifier is specifically rated for 0.5 ohms. Otherwise, you risk damaging your amp and subs.

1. Connect all positive terminals together (coil to coil, sub to sub).
2. Connect all negative terminals together.
3. Run one combined positive lead to the enclosure box positive terminal.
4. Run one combined negative lead to the enclosure box negative terminal.
5. Final impedance = 0.5 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 Series-Parallel Wiring (Final Load ≈ 2 Ohms)

1. Wire each sub positive to negative in sequence across both coils as shown above in Part 1 of Option A.
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 2-ohm final load.

Dual Terminal Wiring → Separate Parallel/Parallel Configuration (Final Load ≈ 0.5 Ohm)
⚠️ Warning: Only use this method if your amplifier is specifically rated for 0.5 ohms. Otherwise, you risk damaging your amp and subs.

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 0.5-ohm final load.

Troubleshooting & FAQs

Q: My multimeter doesn’t read exactly 2 ohms, is that okay?
Yes, readings like 2.1 – 2.2 ohms are normal due to coil resistance tolerances.

Q: What happens if I wire to 0.5 ohms and my amp isn’t stable at that load?
You can blow your subs or your amplifier. Always check the amp’s rated impedance.

Q: Why is my system not as loud as expected?
Your subs may be wired in series-series (8 ohm load), reducing power delivery. Switch to series-parallel.

Q: Which wiring method is best?
For most setups, series-parallel to 2 ohms is the safest and most efficient method.

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

You now know how to wire two DVC (Dual Voice Coil) 2-ohm subwoofers using series-parallel (2 ohms) and parallel (0.5 ohm) configurations. Always match your final impedance to what your amplifier can handle. Using a multimeter to verify your wiring will prevent damage and ensure the best performance.