With a special method of setting up the subwoofers, the double bass array, one tries to influence the resonances of the sound waves in such a way that the undesirable overlaps do not occur in the first place.
Reading tip > What is the double bass array?
How to connect two subwoofers to the amplifier
If your amplifier has two separate subwoofer outputs, you can connect two subwoofers there. If the amplifier has only one subwoofer output, you can use a Y-cin crossover (1 x plug to 2 x socket, available from specialist dealers) here.