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.
ï· changeable elements (such as weather conditions). Landform: The shape (morphology) and character of the land surface that results from the interaction of physical processes. For example, the action of water (fluvial action), action of wind, glacial action and weathering, and the movements within the earth's crust.nd may not flow at all for many years. ï· those where wind is the main agent of erosion. Coastal landscapes: An environment in which water is the main geomorphic agent. Water, in the. form of waves, can either gently lap or violently crash against the coastline. Wind can also be a.