Use this tool to **match amplifier/amp specifications with your subwoofer**. It can be used to select an amplifier for an existing set of subs or an entire system.

**How to use the calculator**

- Enter the impedance in ohm (Ω) and the wattage (W) of each sub.
- Select the configuration – Series or Parallel.
- The tool will provide
- Total
**Effective Impedance**of the subs - Total
**Subwoofer Wattage** - Required
**Amplifier Wattage**range (min and max)

- Total
- Refer to the amplifier data sheet to ensure that it is able to provide the RMS (root-mean-square) power at the specified impedance level.

## Example Calculation

Let’s use the following subwoofer from Sklar as an example. It has an RMS power rating of **1000 W** and impedance of 2 ohm.

This is a Dual Voltage Coil subwoofer. Depending on how it is wired (see the picture below), the effective impedance is either **1 ohm** or **4 ohm**.

Assume it’s wired to give an effective impedance of 4 ohm, and **two of these are used in parallel**. In this case, using the calculator, the total effective resistance is **2 Ω** and the recommended amplifier wattage is between **1800 W** and **2400 W**.

The highlighted amplifier RP-3500.1D would be the most appropriate selection in this case. The specification of this amp is **2300 W** at **2 Ω**.

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