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برق. قدرت. کنترل. الکترونیک. مخابرات. تاسیسات. - سوالات ...powercontrol.mihanblog.com/extrapage/2143Q21 - Why does SPL increase 6 dB for two drivers in parallel, when the electrical power consumed only increases by 3 dB?. A21 - The acoustic power P a radiated from a small source at long wavelengths is the product of the radiating piston area A p, the square of the piston velocity v p, and the real part of the piston's radiation impedance Z p:. P a = (v p) 2 A p Re{ Z p }

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