Used VT4887

VT4887A Package - Complete VT4887A package. Call for more infor...
VT4887A - Industry Staple Corporate Show & Festival Cab...

VT4887A

The VT4887A is a rugged, compact and
lightweight enclosure housing two 8"
woofers, four 4" midrange radiators, and
two high frequency Compression Drivers.
VERTEC's advanced components provide
extremely high power-to-weight ratio.
Enclosure features foam-backed low
frequency grilles, dense protective foam
inserts for midrange apertures and fine steel
mesh grille to protect high-frequency
apertures. Speaker cones are treated with
weather-resistant compounds. VERTEC arrays
are rigid for maximum support strength, yet
flexible in design and application. Rigging
tubes made of hard-black anodized 6061-T6
Aluminum. Hinge bars made from
premium-grade chromoly alloy steel, with
epoxy powder coating over plated surfaces.
Plated hinge pins and stainless steel quickrelease
pin lanyards to resist corrosion and
weather damage. The VT4887A's
suspension hardware relies on quick-release
pins and end-mounted metal tubes to
couple adjacent VT4887A's together.
Enclosure ships with integral front and rear
hinge bar set. Protective grille cover/wheel
board and soft cover ensure handy
transport for rough road conditions,
(purchased separately as VT4887-ACC).

Used JBL

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.

EQ - Equalization, or EQ, applies to any hardware or outboard effect used for the process of changing, increasing or decreasing the level or volume of a certain frequency in a sound to bring that frequenci. Used . es volume in line with the other sounds. It is used in live events and audio recording in film, music, TV and radio. . Used . ...

Zoom Lens - A mechanical assembly of lens elements with the capability to vary its focal length allowing for a closer or farther view of a subject, without changing perspective. Zoom lenses are often described b. Used . y the ratio of their focal lengths from longest to shortest. A 100mm to 400mm zoom may be described as a 4:1 or 4× zoom.

. Used . ...

Crank Lifts - A crank lift is used to manually lift and set a section of scaffolding into place.. Used . . Used . ...

Microphones - A microphone is a device that converts sound waves into an electrical signal. There are many different kinds of microphones, including carbon, condenser, dynamic, and ribbon microphones, all of which . Used . have serve specific needs in recording and audio production. . Used . ...

Analog signal - An analog or analogue signal is any variable signal continuous in both time and amplitude. It differs from a digital signal in that small fluctuations in the signal are meaningful. Analog is usually t. Used . hought of in an electrical context, however mechanical, pneumatic, hydraulic, and other systems may also use analog signals.

The word "analog" implies an analogy between cause an. Used . d effect, voltage in and voltage out, current in and current out, sound in and frequency out.

An analog signal uses some property of the medium to convey the signal's information. For example, an ...

Used Line Array Speakers

Line array speakers make up a loudspeaker system to create a sound source that produces an evenly distributed sound output. The driver of each line array element is close enough to the driver of the next element to create constructive interference. The resulting sound waves go farther than sound waves from traditional loudspeakers. Line array systems date back to the early days of research in acoustics. Many old town halls and public venues still have old line source boxes which were found to project voice well though they are much smaller than horn-loaded speakers. These days, line array speakers use different drivers for high-, mid- and low-frequency passbands that must be in line. Each enclosure must be set up closely to form columns composed of these drivers. To increase the frequency range and maximum sound pressure, the number of drivers per enclosure must be increased. The orientation of line array speakers may vary. Vertical arrays are excellent for focusing sound at audiences without wasting output energy on ceilings or empty air above the audience because of its very narrow vertical output with a normally-wide horizontal pattern. On the other hand, horizontal line arrays have a very narrow horizontal output with a tall vertical pattern. For hanging concert speakers which are usually part of a concert reinforcement system, enclosures are set up together using a specialized rigging hardware and they hang from a single point. These line array speakers are curved backward at the lower portion so that the sound will reach more audience.