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Kensington's first trackball mouse was the Turbo Mouse for Macintosh released in 1986 and trackballs have since been one of the major offerings by the company. Their first laptop physical security lock was made in 1992. [6] Kensington also produced accessories for portable devices like the iPod, including the Stereo Dock in 2005. [7]
KEF introduced the world's first coincident-source speaker driver, called Uni-Q, in 1988, which is now in its 12th generation; and it is still featured in almost all its speakers today. KEF is the first company in the HiFi industry to use metamaterial to absorb the unwanted sound from the rear of a speaker driver; the technology is called ...
Constant-voltage speaker systems are also commonly referred to as 25-, 70-, 70.7-, 100 or 210-volt speaker systems; distributed speaker systems; or high-impedance speaker systems. In Canada and the US, they are most commonly referred to as 70-volt speakers. In Europe, the 100 V system is the most widespread, with amplifier and speaker products ...
In some cases, an audio device may be measured by the total system power of all its loudspeakers by adding all their peak power ratings. Many home theater in a box systems are rated this way. Often low-end home theater systems' power ratings are taken at a high level of harmonic distortion as well; as high as 10%, which would be noticeable. [21]
An active full-range loudspeaker. Powered speakers, also known as self-powered speakers and active speakers, are loudspeakers that have built-in amplifiers.Powered speakers are used in a range of settings, including in sound reinforcement systems (used at live music concerts), both for the main speakers facing the audience and the monitor speakers facing the performers; by DJs performing at ...
Modern home cinema systems typically augment the audio output from a DVD player or Blu-ray player with a multi-channel power amplifier and anywhere from two speakers and a stereo power amp (for stereo sound) to a 5.1 channel amplifier and five or more surround sound speaker cabinets (with a surround sound system).