## How do you calculate winding length?

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To calculate spring wire length per coil, you must subtract the wire diameter from the outer diameter in order to get mean diameter. Once you have calculated mean diameter, multiply it by pi (3.14); this will give you the length of wire per coil.

### How do you calculate the inductance of an air coil?

To calculate the inductance of a single-layer, air-core coil:

- Select the measurement units (inches or centimeters).
- Enter the number of turns (windings).
- Enter the coil diameter (form diameter + wire diameter – see diagram).
- Enter the coil length (distance from first to last winding – see diagram).
- Click Calculate.

**Do I have to use both voice coils on subwoofer?**

Your installer will need to wire both voice coils to your amplifier to ensure that the subwoofer maintains its power rating and functions the way the manufacturer designed it.

**What is voice coil size?**

(Size 76.20mm)

## What’s a better voice coil aluminum or copper?

Copper wins in power and a life time longer over aluminum the only real fact about aluminum is that it is much cheaper and has a much lower temp handling in the voice coils.

### How do you calculate coil winding resistance?

Ohm’s law tells you that current through a wire – even a long wire wound around a motor solenoid – is equal to the voltage divided by the resistance. You can determine the resistance of a motor coil if you know the wire gauge, the radius of the solenoid and the number of windings.

**How do you find the resistance and inductance of a coil?**

The formula for calculating the inductive reactance of a coil is: inductive reactance, or XL, is the product of 2 times p (pi), or 6.28, the frequency of the ac current, in hertz, and the inductance of the coil, in henries. XL =2p x f x L. L = the inductance value of the coil in henries.