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[4] [2] Home cinema 5.1 surround sound audio systems use a crossover that separates out the very-low frequency signal, so that it can be sent to a subwoofer, and then sending the remaining low-, mid- and high-range frequencies to five speakers which are placed around the listener. In a typical application, the signals sent to the surround ...
From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...
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Inspiron XPS – The very first XPS laptop was a very heavy desktop-replacement laptop starting at 9.06 pounds without a power supply (which added 2.5 pounds). This was because it was offered with either a 3.4 GHz desktop Pentium 4 HT "Prescott" processor, or the "Gallatin" Pentium 4 Extreme Edition processor at the same clock speed, which gave ...
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Phantom power is sometimes used by workers in avionics to describe the DC bias voltage used to power aviation microphones, which use a lower voltage than professional audio microphones. Phantom power used in this context is 8–16 volts DC in series with a 470 ohm (nominal) resistor as specified in RTCA Inc. standard DO-214. [19]
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The maximum power allowable on the MPT 1320 27/81 system was 4 watts (in common with the American system), although initially radios were equipped to reduce output power by 10 dB (to 0.4 watts) if the antenna was mounted more than 7 meters (23') above ground level. The power-reduction switch is also useful in reducing TV interference. MPT 1320 ...
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