In a passive loudspeaker system the low-level audio signal is first amplified by an external power amplifier before being sent to the loudspeaker where the signal is split by a passive crossover into the appropriate frequency ranges before being sent to the individual drivers.
A landform is a natural feature of the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography.
Some are rugged and others are flat. In other words, the Earth's surface is made up of different types of landforms. Landforms are any geological feature, such as a mountain or valley. any land feature that froms the earth's surface, mountains,  valleys, plains.Landforms are also shapes that make up the surface.+ 169 others found this useful.here are many kinds of landforms. They can be locations, such as islands; terrain, such as mountains or valleys; or t â¦ hose having specific qualities caused by climate, such as deserts, swamps, and glaciers. Some landforms are created by the action of wind, water, and ice.