Rockville: Pair 4-Ohm SVC Subwoofer Wiring

Introduction

This guide will walk you through the wiring configurations for two single voice coil (SVC) 4-ohm subwoofers.
We’ll cover the most common method—parallel wiring, as well as an alternative series wiring option. The steps are explained in a simple way so you can follow along even if you’re new to subwoofer wiring.
You’ll need:

• Two single voice coil 4-ohm subwoofers
• Speaker wire
• A multimeter (to check impedance)
• An amplifier compatible with the wiring configuration

Step-by-Step Instructions

Step 1: Check Impedance of Each Subwoofer

1. Set your multimeter to measure resistance (ohms).
2. Touch the probes to the positive and negative terminals of each subwoofer.
   • A 4-ohm sub typically reads around 3.8–4.0 ohms.
3. Verify both subs read about the same impedance before wiring.

Step 2: Wire in Parallel (Most Common Method)

Parallel wiring is preferred because it maximizes power output from your amplifier.

1. Connect Positive Terminals
   • Run a speaker wire from the positive terminal of Subwoofer 1 to the positive terminal of Subwoofer 2.
   • Then connect both positives to the positive terminal of the enclosure or amp input.
2. Connect Negative Terminals
   • Run a speaker wire from the negative terminal of Subwoofer 1 to the negative terminal of Subwoofer 2.
   • Then connect both negatives to the negative terminal of the enclosure or amp input.
3. Test the Impedance
   • Use your multimeter at the enclosure’s terminals.
   • You should read about 2 ohms total.
4. Connect to Amplifier
   • Run speaker wire from the enclosure’s terminals to your amplifier.
   • Your amplifier will now see a 2-ohm load.

Tip: A 2-ohm stable monoblock amplifier is commonly used. A 1-ohm stable amplifier running at 2 ohms is also a great option, as it runs cooler, more efficiently, and delivers cleaner sound.

Step 3: Wiring with Dual Terminal Enclosures and Amplifiers (Optional)

Some enclosures and Monoblock amplifiers have two sets of terminals.

• Simply wire each subwoofer directly to its own set of terminals.
• The parallel connection happens automatically inside the amp or enclosure.
• Each terminal pair will read about 4 ohms, but the amplifier sums them together to a 2-ohm load.

Step 4: Wire in Series (Less Common Method)

Series wiring is not usually recommended, as it reduces the power your amplifier can deliver.

1. Connect the positive terminal of Subwoofer 1 to the negative terminal of Subwoofer 2.
2. Run the remaining positive and negative terminals to the amplifier.
3. The total impedance will now be 8 ohms, which significantly reduces output.

Warning: If your subs don’t seem to hit hard, double-check you are not accidentally wired in series.

Troubleshooting & FAQs

Q: Why does my amp not sound powerful enough?

• You may have wired your subs in series (8 ohms) instead of parallel (2 ohms).

Q: My amplifier keeps shutting off. What’s wrong?

• Check that your amp is 2-ohm stable. If not, it may not handle the load.

Q: Can I wire to a 1-ohm load with two 4-ohm SVC subs?

• No. With this setup, the only possible loads are 2 ohms (parallel) or 8 ohms (series).

Conclusion

Wiring two single voice coil 4-ohm subwoofers is simple once you know the configurations:

• Parallel wiring = 2 ohms (recommended for max power).
• Series wiring = 8 ohms (less output, not common).

Always match your subwoofers with an amplifier that can handle the correct load. For most setups, a 2-ohm stable monoblock amplifier is the ideal choice.