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  2. Sound reinforcement system - Wikipedia

    en.wikipedia.org/wiki/Sound_reinforcement_system

    Low-frequency signals are sent to amplifiers and then to subwoofers, and middle and high-frequency sounds are typically sent to amplifiers which power full-range speaker cabinets. Using a crossover to separate the sound into low, middle and high frequencies can lead to a "cleaner", clearer sound (see bi-amplification ) than routing all of the ...

  3. Subwoofer - Wikipedia

    en.wikipedia.org/wiki/Subwoofer

    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 ...

  4. Covox Speech Thing - Wikipedia

    en.wikipedia.org/wiki/Covox_Speech_Thing

    Consists of a FIFO buffer with a DAC on the board that plugs into the parallel printer port, which transmits analog audio over a registered jack to a separate amplifier / speaker box. [8] Its price was set to only $14 [9] and it was supported by many games (see below). It used external power (9 volt battery) and could be turned on/off by software.

  5. Radio receiver design - Wikipedia

    en.wikipedia.org/wiki/Radio_receiver_design

    Sensitivity is the ability to recover the signal from the background noise. Noise is generated in the path between transmitter and receiver, but is also significantly generated in the receiver's own circuits. Inherently, any circuit above absolute zero generates some random noise that adds to the desired signals.

  6. Home cinema - Wikipedia

    en.wikipedia.org/wiki/Home_cinema

    The audio system requires at least a stereo power amplifier and two speakers, for stereo sound; most systems have multi-channel surround sound power amplifier and six or more speakers (a 5.1 surround sound system has left and right front speakers, a centre speaker, left and right rear speakers and a low-frequency subwoofer speaker enclosure ...

  7. Bridged and paralleled amplifiers - Wikipedia

    en.wikipedia.org/wiki/Bridged_and_paralleled...

    A bridge-parallel amplifier topology is a hierarchical combination of the bridged and paralleled amplifier topologies, with at least four single-ended channels needed to produce one bridge-parallel channel. The two topologies complement each other in that the bridging allows for higher voltage output and the paralleling provides the current ...

  8. Obama vs. Romney Electoral Map - elections.huffingtonpost.com

    elections.huffingtonpost.com/2012/romney-vs...

    Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 332 electoral votes and Romney at 191.

  9. Naim Audio amplification - Wikipedia

    en.wikipedia.org/wiki/Naim_Audio_amplification

    Naim power amplifiers are given numbers according to their power output into nominal load of 4 ohms. The company's first amplifier, the NAP 160, is a two-channel power amplifier with an output of 60 watts per channel; the NAP 135, which is a one-channel amplifier based on the same design as the NAP 250 rated at 135 watts. A custom-built very ...