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Computer speakers, or multimedia speakers, are speakers sold for use with computers, although usually capable of other audio uses, e.g. for an MP3 player. Most such speakers have an internal amplifier and consequently require a power source, which may be by a mains power supply often via an AC adapter , batteries, or a USB port.
The first IBM Personal Computer, model 5150, employed a standard 2.25 inch magnetic driven (dynamic) speaker. [1] More recent computers use a tiny moving-iron or piezo speaker instead. [ 2 ] The speaker allows software and firmware to provide auditory feedback to a user, such as to report a hardware fault.
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 ...
This approach takes into account the natural low-frequency responses of the main speakers, which roll off at 12 dB/octave for sealed enclosures, and 18–24 dB/octave for vented enclosures. The aim is to have the low-pass filtered and high-pass filtered signals be −6 dB at the crossover frequency, producing what is known as an acoustical 4th ...
The Dell XPS 15 Touch Screen laptop (9530, using Haswell) was first released in October 2013, and is a high-end notebook. It was the fourth generation XPS 15, which has taken many of the design elements of the Ivy Bridge Edition XPS 15 but fixes the cooling/throttling, adds a Haswell CPU and an updated GeForce GT 750M, no optical drive, and a ...
[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 ...
a device like a silicon controlled rectifier or a transistor used as a switch may be employed to turn either fully on or off a load such as a lamp based on a threshold in a continuously variable input. a non-linear amplifier in an analog computer or true RMS converter for example can provide a special transfer function, such as logarithmic or ...
These types of units typically do not have any local storage of their own and must rely on a server, typically a personal computer also on the same network, to provide the audio files for playback. Some MP3 players can encode directly to MP3 or other digital audio formats directly from a line-level audio signal (radio, voice, etc.).