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Line out provides an audio signal output and line in receives a signal input. The line in/out connections on consumer-oriented audio equipment are typically unbalanced , with a 3.5 mm (0.14 inch, but commonly called "eighth inch") 3-conductor TRS minijack connector providing ground, left channel, and right channel, or stereo RCA jacks .
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 ...
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 1998, JL Audio launches the Evolution line of Evolution component speakers and coaxials. The WØ line is expanded to include 8-inch and 15-inch drivers. JL Audio moves its headquarters to a 92,000 square-foot facility in Miramar, FL. In 1999, W3 subwoofers are introduced. The Stealthbox, PowerWedge and Evolution lineups are further expanded ...
These input sources feed into preamplifiers and signal routers that direct the audio signal to selected zones of a facility (e.g., only to one section of a school). The preamplified signals then pass into the amplifiers. Depending on local practices, these amplifiers usually amplify the audio signals to 50 V, 70 V, or 100 V speaker line level. [16]
[2] [6] The Naim Audio Integrated amplifier (or NAIT) was created by Julian Vereker as a minimalist black shoe-box design that includes a phono and two line-level inputs – one for tuner and one for tape recorder. [7] The phono input, for moving magnet cartridges, is derived from the NAC 32 pre-amplifier. [2]
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