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VRX Line Array Subs

JBL's VERTEC Series Line Arrays lead the industry in large Venue sound reinforcement. While intended
for smaller Venues than VERTEC, the VRX900 Series Constant Curvature Line Arrays are designed and built to the same
high standards and uses the same advanced, concert-proven drivers. JBL's VRX900 Series speakers deliver extraordinary
power handling, clarity, flexibility and, of course, stunning JBL sound in an attractive, easy to handle and affordable package.

JBL Line Array Subs

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.

Amphitheatre - The name amphitheatre (alternatively amphitheater) is given to a public building of the Classical period (being particularly associated with ancient Rome) which was used for spectator sports, games an. Used . d displays.

Apart from function, the important outward distinction between an amphitheatre and a theatre is that an amphitheatre is round or oval in shape (whereas a classical th. Used . eatre was semi-circular). However, an amphitheatre differs from a circus, which was used for racing and looked more like a very long, narrow horse shoe.

The best-known amphitheatre in the world is...

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. ...

Wavelength - The distance from one point, usually the crest, on a vibrating wave to the same point on the next wave. The shorter the wavelength the higher the frequency and the more directional the wave and vice . Used . versa. Commonly designated by the Greek letter lambda (?), wavelengths are usually measured in Angstroms.. Used . ...

Backline - Backline is equipment that is located behind a live band while they are performing. Such examples of backline include amps for guitars and basses. It is the equipment that the band needs aside from . Used . the actual instruments that they are holding and using and the PA and FOH desks.

. Used . ...

Dichroic - In optics, the term dichroic has two related but distinct meanings. A dichroic material is one which either causes light to be split up into distinct beams of different wavelengths (colours), or, one . Used . in which light rays having different polarizations are absorbed by different amounts.

The original meaning of dichroic (from the Greek dikhroos, two-coloured) refers to any optic. Used . al device which can split a beam of light into two beams with differing wavelengths. Such devices include mirrors and filters, usually treated with optical coatings, which are designed to reflect light over a ...

Line Array Subs

Line array subs are essentially a long line segment of numerous smaller speakers attached together, designed to simulate a much larger speaker. Line array sub woofers have become the speaker of choice for both large concert venues and outdoor events, not to mention public announcement systems, thanks to their practicality and high quality sound output, which is considered to be superior conventional speakers. Two kinds of line array subs are used the most common are vertical line array subs, which produce superior sound output as they create a 3dB drop-off with vast horizontal projection, yet very little vertical diffusion. And because the speakers are installed close together, they can interfere with each other in a constructive way that helps to project the sound waves a much further distance than regular speakers. Essentially, what this means is that line array sub woofers are able to concentrate sound in a very narrow wavelength, which can be directed straight at the audience for maximum effect, making them perfect for public announcements. Vertical line arrays are also the main choice for sound production in live concerts, as they have a very wide horizontal output pattern, allowing the sound to be focused over a large area. Vertical arrays are strategically placed to provide optimum coverage for the entire venue, while horizontal arrays are normally used at the front of the stage to compliment the vertical line array subs.