Use this tool to **calculate the amplifier output power for a car audio system**. The system consists of an amplifier, speakers and subwoofers.

**How to use the calculator**

- Enter
- Amplifier RMS output power per channel
- Amplifier impedance in ohm (Ω)
- Impedance in ohm (Ω) for each speaker connected to the amp

- The tool will provide RMS output power

## Example Calculation

Let’s use the following car amplifier from DS18 as an example. It has an **RMS power rating of 200 W per channel at impedance of 4 ohm**.

If we want to match them with these JBL Speakers, with **60 W nominal power and 2.3 Ω impedance**, there’s a risk that these speakers will be damaged as according to the calculator the amplifier will deliver **350W **of power to the speaker.

On the other hand, let’s consider the following speakers with **250 W RMS and 4 Ω impedance. **In this case, the amplifier will be able to deliver **200 W RMS** with the impedance match. This is a compatible solution.

**Note that the power estimate provided by the calculator on this page is an ideal approximation. **

As an example let’s consider this amplifier. According to the spec it is able to provide the following:

- 320 W x 4 CH at 2-ohms
- 200 W x 4 CH at 4-ohms

According to the calculator it should only be able to provide **160 W at 4 ohm**. However a higher output wattage of 200 W is quoted in the specification.

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