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Portable pa system for Dummies

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Every time a very well-corrected lens is used rather than a pinhole, the geometrical ray divergence is eradicated because of the focussing action on the lens, plus a much bigger aperture may very well be utilized; in that situation the diffraction spreading gets to be tiny indeed. The picture of https://glassesnearme35210.blogginaway.com/30450312/everything-about-portable-speaker

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