During the next step, Maxis asks you to destroy the so-called Amplifiers. These are four orb-like devices, embedded in the ground, spread across the map. Their locations are the following:
One in the alley between the Saloon and Candy Shop
One on the left side of the Church, behind a large rock laying in front of the Church.
One somewhere in the mining caverns above the Town.
One in the backyard of the Mansion but before the Maze. Upon exiting the Mansion, at the right side of the foliage.
To destroy an Amplifier, one has to place a Subsurface Resonator aimed at one. Now place a Turbine next to it and the Subsurface Resonator will break the Amplifier.
Hint: To build the Subsurface Resonator and Turbine, one can use the Big Guy by giving him a candy in front of a workbench.