![A number of transportable 19-inch rack cases on rollers, each comprising a stack of professional power amplifiers of a sound reinforcement system (PA sytem). This is a typical scene/setup seen at open air music festivals or open air concerts, here at the Quadfest music festival at Radford University in Virginia, United States.The power amplifiers are various models from the companies QSC and Crest Audio.](http://upload.wikimedia.org/wikipedia/commons/thumb/4/44/Amps_%28QuadFest%29.jpg/800px-Amps_%28QuadFest%29.jpg)
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current | 18:10, 2 January 2022 | ![]() | 3,099 × 1,692 (2.49 MB) | Pittigrilli | Cropped 18 % horizontally, 33 % vertically using CropTool with precise mode. |
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