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2446H Compressors and Limiters

...ows coherent summation of acoustical power up to much higher frequencies than afforded by earlier designs.

The diaphragm design includes JBL's exclusive three-dimensional diamond pattern surround1 which reduces membRane stresses in the diaphragm support structure and extends diaphragm life. The depth of the diamond pattern is closely controlled during the manufacturing process to provide predictable frequencies for the 2nd and 3rd normal resonance modes and for the basic suspension resonance mode.

The diaphragm also incorporates a series of embossed Radial reinforcing ribs that increase diaphragm stiffness. This diaphragm, when combined with the Coherent Wave phasing plug, increases the 2446H/J's output in the 5 kHz to 20 kHz range.

JBL Compressors and Limiters

James Bullough Lansing was born James Martini, 14 January 1902, in Macoupin County, Millwood Township, Illinois. His parents were Henry Martini, born in St. Louis, Missouri, and Grace Erbs Martini, born in Central City, Illinois. The elder Martini was a coal mining engineer, and his work required that the family moved about quite a bit during Lansing's early years. Lansing was the ninth of fourteen children, one of whom died in infancy. For a short time, Lansing lived with the Bullough family in Litchfield, Illinois. He later took their name when he changed his from Martini to Lansing. Not much is known about Lansing's early days, and we are indebted to Bill Martin, one of three surviving brothers, for providing most of the information presented here. Lansing graduated the eighth grade at the Lawrence School in Springfield, Illinois. He also attended the Springfield, Illinois, High School. Later, he took courses in a small business college in Springfield. As a young lad he was very interested in all things electrical and mechanical. At about the age of 10, he built a Leyden Jar which he used to play pranks on his playmates. He also constructed crystal sets, and at one time, probably about the age of 12 or so, built a small radio transmitter from scratch. The signals from this set were apparently strong enough to reach the Great Lakes Naval Station in Illinois; naval personnel determined the source of these signals and later supervised the timely dismantling of the young Lansing's radio transmitter. For a while Lansing worked as an automotive mechanic, specializing in fine engine repair work. He attended an automotive school for mechanics in Detroit through the courtesy of the dealer he worked for in Springfield. Lansing's mother died 1 November 1924 at the age of 56, and at that time Lansing left home. As best we can determine, he went directly to Salt Lake City. Mrs. Lansing, the former Glenna Peterson of Salt Lake City, tells of meeting Lansing in 1925 in that city. At the time he was working for a radio station as an engineer. In addition, he worked for the Baldwin loudspeaker company in Salt Lake City for a time. He also met his future business partner, Ken Decker, in Salt Lake City.

Hazer - A Smoke Machine or Fogger is an electrical device that creates clouds of artificual and hopefully non-toxic fog. The fog may come in different colors or smells and may be water or mineral based. It i. Used . s used for effects in theatre, staging, concerts and clubs.

A Hazer by contrast create a more diffusive, expansive haze that is usually not a thick and is used to enhance other e. Used . ffects, such as lighting and light beams.

Large Format Mixers - Large format mixers are audio mixers having more than 24 channels for input/output.. Used . . Used . ...

Cue - Generally, a lighting board operator has a cue sheet for each scene, which is a diagram of the board with the faders in their positions as determined by the lighting designer. The operator sets the fa. Used . ders into their positions based on the cue sheets. Typically during a cue, the operator sets the next scene. Then, the operator makes the transition between the scenes using the cross-fader.. Used . ...

Lumen - In physics, specifically photometry (optics), the lumen (symbol: lm) is the SI derived unit of luminous flux. It is the amount of light that falls on a unit spherical area at unit distance from a sour. Used . ce of one candela. In steradians this is equivalent to the amount of light that falls on a unit solid angle from a light source of one candela. Alternatively, one lumen is the total light pro. Used . duced by an isotropic light source of (1/4p) candelas. A 100 watt incandescent light bulb will output around 1500 lumens. ...

Fog - A fogger is a device that emits a dense vapor that appears similar to fog or smoke,
usually by the vaporization of a water and glycol based or glycerine based fluid. A hazer or diffusion fogger. Used . is used to produce an atmospheric haze, rather than clouds of smoke, and is used by many lighting designers to reveal airborne light beams, especially lazers. . Used . ...

Compressors and Limiters

Audio compressors and limiters are a kind of specialist hardware used to either amplify the volume of quiet sounds or reduce the volume of loud sounds, by simply compressing the “dynamic range” of an audio signal. Audio compression is commonly used during live concerts, broadcasts and studio recording. Audio compressors and limiters, sometimes called a dynamic compressor, can manipulate the volume of sound by alternating the rate of compression through two basic functions – attack and release controls, which are also able to smooth the final effect of the audio output. There are many different kinds of compressors and limiters available, including very basic models with just a few simple knobs for attacking and releasing, and more advanced models which provide greater versatility when it comes to attenuating audio signals. Audio technicians place an extremely high value on compressors and limiters. An audio limiter is essential for managing the level of audio signals during recording sessions. If the volume produced by a piano for example, is not managed, the recording equipment could easily be overloaded when the pianist plays louder, impacting on the quality of the final recording. Similarly, when the pianist plays at a lower volume, audio compressors and limiters are needed to boost the volume level so that the signal remains consistent throughout. In addition to managing signal levels, compressors and limiters can also be used to create special effects and add an extra dimension to recordings. Audio limiters are able to compress dynamic range audio signals into a much narrower range, hence why they are sometimes called a dynamic compressor. The results of such audio compression include attaining a higher source signal from low volume sound, smooth and consistent tones, an increase in some musical instruments sustain and the ability to enhance the “punch” of certain instruments, such as guitars, bass and drums.