How to Change a 4-Ohm Speaker to 2-Ohm- Step by Step

Most vehicle sound systems are equipped with speakers that have a 4-ohm impedance. Automotive audio systems operate on direct current (DC) rather than alternating current (AC) at 120 volts. The ohm rating of a loudspeaker indicates its impedance under dynamic acoustic conditions. It is feasible to extract considerable power from a low voltage audio amplifier by using audio speaker systems with a 4-ohm impedance.

When a volt-ohm meter is used to conduct direct current, this value is greater than the circuit’s electrical resistance. It is one of the numerous classifications used by individuals to match speakers to amplifiers. The concern “How to convert a four-ohm speaker to a two-ohm speaker?” is frequently asked when connecting four-ohm automobile speakers to two-ohm amplifiers, although this is not always the case.

This article details the procedure for converting a 4-ohm speaker to a 2-ohm speaker. To achieve the best results, carefully follow the steps. Moreover, you’ll find the most frequently asked questions about this subject, along with their related responses. This will aid in the development of a more precise grasp of what you will require.

Steps on how to change a 4-ohm speaker to 2-ohmhow to change a 4 ohm speaker to 2 ohm

Amplifiers are rated based on their minimum allowable impedance, specified by the manufacturer. Each amplifier is different, and some become unstable at 2 ohms because of the inherent instability. In general, you’re altering the load on the amplifier rather than its tolerance for a lower impedance level. Nearly one-half of the power of an amplifier is wasted when it is connected to a 4-ohm load.

To convert your 4-ohm speaker to a 2-ohm speaker, follow these steps;

Step 1: Disconnect the system’s power source. In the process, there should be no electrical current going to your amplifier or speakers.

Step 2: Determine the length of speaker wire required to connect the amplifier’s input to the amplifier’s speaker input. Keep in mind the cable’s path from your amplifier to your speaker and vice versa.

Step 3: Cut the wire in half so that each end is 14 inches shorter than the other. The wire ends will be placed into the amplifier’s terminals and the speaker wiring’s terminals.

Step 4: Connect the positive cable (red) to the amplifier’s positive and speaker input. Connect the negative wire (white) to the amplifier’s and speaker’s negative inputs as well.

Step 5: Reconnect the system’s power supply. Verify that your amplifier and speakers are receiving power. To begin, turn on your amplifier and speakers. Adjust as necessary.

Increasing the bass output using a capacitorIncreasing the bass output using a capacitor

It is possible to achieve bass output using subwoofer speakers; these speakers play low bass frequencies that have been specifically tuned and constructed for that purpose. One of the reasons subwoofers work poorly is a lack of power. Without sufficient power, the sound generated by a high-powered subwoofer would undoubtedly be diminished.

While the subwoofer’s amplifier is operating at peak performance, electricity is provided to the amplifier via a capacitor. While excessive power consumption occurs (for example, when bass-heavy music is played excessively loudly), the capacitor connects to the battery and stores energy for the amplifier. This ensures that the amplifier receives sufficient current during periods of high power use.

Adhere to these steps;

Step 1: Ensure you disconnect the amplifier’s power cables from the vehicle’s battery.

Step 2: Disconnect the amplifier’s power wires. The wires that link the amplifier to the car’s battery and the contacts that power the amp are shown here. Keep an eye out for which cables are positive and the negative wires always. 

Step 3; connect these power cables to the capacitor’s “Power In” ports. Each port will have a “+” or “Positive” and a “-” or “Negative” sign. Ascertain that the necessary wires are connected to the computer system’s appropriate connectors, both positive and negative.

Step 4: Cut the exact type of cable that feeds battery voltage to the amplifier. Trimming a minor bit of length will be necessary. Cut this wire into two 3 to 4-foot lengths. Determine which wires will function as positive and the negative cables.

Step 5: Connect a wire to the negative terminal of the capacitor labeled “Power Output.” Connect the amplifier’s negative power input to the extreme side of the cord.

Step 6: Connect the positive end of the capacitor marked “Power Output” to the other wires.  The other end of the cable should be linked to the amplifier’s positive power input.

Step 7: attaching the stereo’s electric wires to the car battery is a simple task. Start the car and allow it to idle for approximately 10 minutes to replenish the capacitor fully. During this period, avoid playing music on your stereo. After around ten minutes, try turning on the stereo to evaluate its operation.


Numerous audio writers employ the analogy of water running through a pipe to illustrate watts, volts, and power because it provides a visual and relevant image for listeners. Multiple amplifiers are specifically built to work with 4-ohm speakers. You can enlarge it using the pipe as an analogy. However, it will only convey additional water (audio) if the pump (amplifier) is powerful enough to supply the increased water flow.

Frequently asked questions:

  • What is the difference between 2 Ohm and 4 Ohm car speakers?

Answer: The primary difference between 2 and 4-ohm automotive speakers is the amount of power they draw from the amplifier. When compared to four-ohm speakers, two-ohm speakers require a more powerful amplifier. As a result, two-ohm speakers are louder than four-ohm speakers, although they produce poorer sound quality.


Most developers balance their speakers’ impedance to achieve consistent quality throughout the audio spectrum. A speaker designer may smooth areas of high resistance using electrical circuitry. As a result of this increased concentration, 4-ohm speakers are typical in high-end audio but uncommon in consumer audio. The resistance of the speaker changes in lockstep with the pitch of the sound.

The speaker’s impedance specification is only an approximation. Ensure that you read the full article to acquire a thorough grasp of how to change a 4-ohm speaker to a 2-ohm speaker and improve the bass output using a capacitor. Kindly contact us if you have any questions about the same.

The most common question we are asked here at Sonic Electronix is “How do I hook up my subs?” This video is designed to give you a step by step tutorial on how to wire your subwoofers. Correct subwoofer wiring is necessary to make sure that your system is properly installed.

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