Subs are a welcome addition to the world of modern church audio, but along with the benefits come some inherent difficulties. Other system designers prefer the floor, which adds apparent power through coupling with the floor surface. Some line arrays are designed to fly subs along with the main speakers, some will locate them behind the main rig. Subwoofers, which had never really lost significance, became more important than ever in meeting the demand for ever-increasing sonic intensity in the basement frequencies, particularly as Electronic Dance Music (EDM) became more popular. The huge shift towards line arrays also meant that the ‘main' system on its own wouldn't always be suitable for providing deep bass. Measurement systems grew ever-more sophisticated, permitting the loudspeaker designer to more realistically understand what was taking place in a prototype system. The next four decades saw a lot of changes in loudspeaker technology. Thus, the concept of the subwoofer was born. But because horns must be many feet in length and very large in mouth area to properly control lower frequencies, most early loudspeaker designs had less-than-impressive LF output, especially in the deep bass region. Way back in the dawning days of sound reinforcement, when very few loudspeaker manufacturers existed and most sound rental companies built their own sound systems, the developing industry learned that low-frequency (LF) horn loading was important to keep the sonic energy focused on the audience and away from the walls and ceiling.
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