2-Ohm Vs 4-Ohm Subwoofer: Which Is Better?

Subwoofers are vital in car audio systems. Regular speakers can’t match their punchy bass. Because subwoofers are designed to reproduce low frequencies, Bass is a low-frequency sound. While a subwoofer is a must-have for bass enthusiasts, terms like wattage, impedance, and resistance can be confusing.

Most people are unfamiliar with the term resistance. ohms or this sign on a subwoofer. It helps to know what resistance means. Resistance is a measure of an electric circuit’s opposition to the flow of current. Resistance is ohms.

Subwoofers are usually powered by an audio signal from a head unit or amplifier. They are resistant to audio signals. Most modern subwoofers have a 2 or 4 ohm resistance rating. While your stereo or amp may work fine with either a 2 or 4 ohm sub, it would be helpful to know which produces the best bass. So, let’s examine each subwoofer’s resistance rating.

2 Ohm Sub

When buying a subwoofer, look for a 2 ohm rating. A 2 ohm rating means it has low resistance in its circuit. So an amplifier can easily feed it more power. Because the resistance is low, the sub will be louder. However, due to its low resistance, it consumes more power, lowering bass quality.

Ohm Subwoofer

A 4 ohm subwoofer has a higher resistance. Due to its high resistance, it produces less sound. As a result, it lacks bass. With high resistance, it requires less power from an amplifier. As a result, even though it is less loud, it reproduces more compact sound.

Then what if you have two?

The wiring option you choose for multiple subwoofers in your car will determine their resistance. Subwoofers can be wired in series or parallel. Series wiring means connecting the negative terminal of one sub to the positive terminal of the next. In parallel wiring, you simply connect the positive and negative terminals of one sub to the same terminals of another sub.

Putting the subwoofers in series increases resistance. For example, if you connect two 2-ohm subwoofers in series, the total resistance will be their resistances added together, which equals 2+2, or 4 ohms. But if you wire subwoofers in parallel, the total resistance is one subwoofer divided by the number. For example, if you connect two 2 ohm subwoofers in parallel, the total resistance will be 2/2, or 1 ohm. Paralleling subwoofers reduces total resistance.

A subwoofer with dual voice coils

A dual voice coil subwoofer is a rare find. A dual voice coil subwoofer has 2 or 4 voice coils, each with a different resistance. In this case, the wiring used to connect it to an amplifier determines the overall resistance. For example, a dual voice coil subwoofer with a 4 ohm resistance can be wired in series for a 4+4 (8 ohm) overall resistance or in parallel for a 4/2 overall resistance (1 ohm)

So, which is better, a 2 ohm or 4 ohm sub?

Knowing the differences between 2 ohm and 4 ohm subs, as well as how wiring multiple subs affects total resistance, can help you decide which is better. Basically, both are good. The type of bass you want will determine which option you choose. A 4 ohm subwoofer will give you the best quality bass at a moderate volume. Also, connecting multiple subwoofers in series increases resistance and thus bass quality. A 2-ohm amplifier will produce the loudest bass, while connecting multiple subs in series will reduce resistance and thus increase volume.


A subwoofer won’t give you the bass you want in your car. There’s a lot more. The sub’s resistance determines the bass’s volume and quality. Determining the sub’s power requirements from the car amplifier or head unit. A 2 ohm subwoofer uses less power from the amp and produces more bass. An amp will have to work harder to drive a 4 ohm subwoofer, but the bass will be better. So, choose based on your bass preferences.