When a dual 4-ohm DVC speaker is wired with coils in parallel, what DC resistance value does it yield to the amplifier?

When dealing with a dual 4-ohm (DVC) speaker, each voice coil has a nominal impedance of 4 ohms. When these coils are connected in parallel, the total impedance can be calculated using the formula for parallel resistances, which is:

1 / Z_total = 1 / Z1 + 1 / Z2

In this case, since both voice coils are the same at 4 ohms:

1 / Z_total = 1 / 4 + 1 / 4

1 / Z_total = 0.25 + 0.25

1 / Z_total = 0.5

Now, to find Z_total, we take the reciprocal:

Z_total = 1 / 0.5 = 2 ohms

This means that when a dual 4-ohm voice coil speaker is wired with coils in parallel, it yields a total impedance of 2 ohms to the amplifier. This configuration allows for greater current flow, which can be advantageous for power handling, provided that the amplifier can support a 2-ohm load safely. Understanding the implications of impedance in speaker wiring is crucial for optimal performance and preventing damage to equipment.