Altec Lansing

Altec Lansing Bookshelf loudspeakers
An Altec Lansing PC speaker
An Altec Lansing iM227 speaker from the Orbit M series

U.S. audio electronics company founded in 1927.

- Altec Lansing

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JBL

American company that manufactures audio hardware, including loudspeakers and headphones.

Lansing Iconic
Bluetooth headphones "Synchros E50BT"
Car sub-woofer "1200GTI"
3-way loudspeaker system "Ti2000"
Flip 3 Bluetooth speaker
JBL Flip 4 portable Bluetooth speaker

JBL was founded by James Bullough Lansing (1902–1949), an American audio engineer and loudspeaker designer best known for establishing two audio companies that bear his name, Altec Lansing and JBL, the latter taken from his initials.

Woodstock

Music festival held August 15–18, 1969, on Max Yasgur's dairy farm in Bethel, New York, 40 mi southwest of the town of Woodstock.

Promotional poster designed by Arnold Skolnick Originally, the bird was perched on a flute.
Max Yasgur's dairy farm in 1968
Woodstock festival site with the stage
Joe Cocker performs on stage at left before crowd and huge lighting/sound towers
Magazine advertisement promoting the Woodstock Music & Art Fair's "Aquarian Exposition," to be held in Wallkill, NY.
Peace and Music Woodstock monument with plaques by sculptor Wayne C. Saward and erected in 1984 on the festival site. (Note that John Sebastian's surname is misspelled as "Sabastian" and Bert Sommer's name is missing)
Opening ceremony at Woodstock. Swami Satchidananda giving the opening speech
A rainy day (August 15, 1969)
Concert attendees
Joe Cocker and the Grease Band performing at Woodstock
Photo taken near Woodstock on August 18, 1969
Richie Havens performing at Woodstock
Tents and cars of spectators at Woodstock

ALTEC designed marine plywood cabinets that weighed half a ton apiece and stood 6 ft tall, almost 4 ft deep, and 3 ft wide.

Ling-Temco-Vought

Large US conglomerate which existed from 1961 to 2000.

A-7 Corsair II aircraft made by Ling-Temco-Vought. This example, a former US Navy aircraft, was photographed at a British airshow in 2005. It was retired from service by 2014 from the Hellenic Air Force (Greece).

In 1956 Ling bought L.M. Electronics, and in 1959 added Altec Electronics, a maker of stereo systems and speakers.

Loudspeaker

[[File:Electrodynamic-loudspeaker.png|thumb|Hi-fi speaker system for home use with three types of dynamic drivers 1. Mid-range driver

Kellogg and Rice in 1925 holding the large driver of the first moving-coil cone loudspeaker
A four-way, high fidelity loudspeaker system. Each of the four drivers outputs a different frequency range; the fifth aperture at the bottom is a bass reflex port.
Exploded view of a dome tweeter
Electronic symbol for a speaker
A passive crossover
A bi-amplified system with an active crossover
An unusual three-way speaker system. The cabinet is narrow to raise the frequency where a diffraction effect called the "baffle step" occurs.
A three-way loudspeaker that uses horns in front of each of the three drivers: a shallow horn for the tweeter, a long, straight horn for mid frequencies and a folded horn for the woofer
Two-way binding posts on a loudspeaker, connected using banana plugs.
A 4-ohm loudspeaker with two pairs of binding posts capable of accepting bi-wiring after the removal of two metal straps.
HP Roar Wireless Speaker
Specifications label on a loudspeaker
Polar plots of a four-driver industrial columnar public address loudspeaker taken at six frequencies. Note how the pattern is nearly omnidirectional at low frequencies, converging to a wide fan-shaped pattern at 1 kHz, then separating into lobes and getting weaker at higher frequencies
Moving iron speaker
A piezoelectric buzzer. The white ceramic piezoelectric material can be seen fixed to a metal diaphragm.
Magnetostatic loudspeaker
Schematic showing an electrostatic speaker's construction and its connections. The thickness of the diaphragm and grids has been exaggerated for the purpose of illustration.
In Heil's air motion transducer, current through the membrane 2 causes it to move left and right in magnetic field 6, moving air in and out along directions 8; barriers 4 prevent air from moving in unintended directions.
Plasma speaker

Altec Lansing introduced the 604, which became their most famous coaxial Duplex driver, in 1943.

James Bullough Lansing

James Bullough Lansing (born James Martini, January 2, 1902 – September 29, 1949) was a pioneering American audio engineer and loudspeaker designer who was most notable for establishing two audio companies that bear his name, Altec Lansing and JBL, the latter taken from his initials, JBL.

Plantronics

American electronics company – branded Poly to reflect its dual Plantronics and Polycom heritage – producing audio communications equipment for business and consumers.

Early Plantronics headset
Neil Armstrong with Plantronics headset
Plantronics StarSet patent drawing showing proposed use of invention
Plantronics office headset on its charger
Plantronics BackBeat PRO 2 box
Plantronics booth at the CES 2012 trade show
NASA Astronaut Neil Armstrong wearing "Snoopy cap" with Plantronics (SPENCOM) headset prior to his Apollo 11 lunar landing in 1969.
NASA Astronaut Tom Stafford wearing "Snoopy" cap with Plantronics (SPENCOM) headset in 1975 (Apollo-Soyuz Mission)
Plantronics (SPENCOM) headsets in use by NASA Astronauts Evans and Cernan, both wearing "Snoopy" caps, aboard the Apollo 17 spacecraft.

In 2005, Plantronics acquired computer speaker manufacturer Altec Lansing for approximately $166 million.

Altec Lansing Duplex

Altec 604 Duplex Loudspeaker
Original Altec 604 Sales Literature, Page 1
Cutaway View Of Altec 604 Duplex Loudspeaker
Comparison of the different horns used in the Altec 604 and 604B and the one used in the 604C-G
Altec 605A Advertisement, 1959
Altec 604E SuperDuplex Specification Sheet, Page 1
Altec Lansing 604-8K Duplex Loudspeaker
Current version of the Altec 604

DUPLEX was the trade name given by Altec Lansing to its line of coaxial loudspeakers, beginning with the first model 601 in 1943.

John Kenneth Hilliard

American acoustical and electrical engineer who pioneered a number of important loudspeaker concepts and designs.

photo courtesy of Todd W. White

Hilliard collaborated with James B. "Jim" Lansing in creating the long-lived Altec Voice of the Theatre speaker system.

Sparkomatic

USA-based manufacturer of car audio products.

Three amplidynes, from a 1951 General Electric advertisement (not to same scale). (top left) 1 kW amplidyne motor-generator, (bottom left) 3 kW amplidyne motor-generator, (right) 5 kW amplidyne generator.

In 1992 the company decided to purchase Altec Lansing from Telex.

Subwoofer

Loudspeaker designed to reproduce low-pitched audio frequencies known as bass and sub-bass, lower in frequency than those which can be (optimally) generated by a woofer.

12-inch (30 cm) subwoofer driver (loudspeaker). A driver is commonly installed in an enclosure (often a wooden cabinet) to prevent the sound waves coming off the back of the driver diaphragm from canceling out the sound waves being generated from the front of the subwoofer.
View of the underside of the downward-firing Infinity Servo Statik 1, showing the size of the 18-inch (45 cm) custom-wound Cerwin-Vega driver in relation to a can of Diet Coke, to show scale.
A display of Cerwin-Vega speaker enclosures at the 1975 Audio Engineering Society meeting.
A crew sets up a sound system, including large bass bins, in Jamaica in 2009.
The 1987 Bose Acoustimass 5 stereo bass driver contained one six-inch (152 mm) driver per channel and provided crossover filtering for its two cube speaker arrays.
Cross-section of a subwoofer drive unit.
Bass reflex enclosure schematic (cross-section).
Heavily braced and built subwoofer enclosure.
A large subwoofer cabinet used in a home hi-fi system.
This picture of the internal components of an active (powered) subwoofer shows the circuitry for the power amplifier.
This rear panel of a powered subwoofer shows the heat sinks used to cool the power amplifier.
This picture of the rear panel of a Polk subwoofer cabinet shows a low-pass filter adjustment knob.
The rear panel of a down-firing, active subwoofer cabinet.
Basic sealed subwoofer in a residential setting.
A small subwoofer cabinet designed for use with a home computer.
Multiple subwoofers in a hatchback car.
Each stack of speakers in this sound reinforcement setup consists of two EAW SB1000 slanted baffle subwoofers (each contains two 18-inch drivers) and two EAW KF850 full range cabinets for the mid and high frequencies.
A row of subwoofer cabinets in front of the stage of a rock concert. One enclosure out of every stack of three is turned backward to make a cardioid output pattern.
Large subwoofer enclosures.
Cardioid dispersion pattern of two end-fire subwoofers placed one in front of the other. The signal feeding the enclosure nearest the listener is delayed by a few milliseconds.
CSA: Six subwoofers arranged for less bass energy on stage. Signal going to the reversed enclosures is delayed a few milliseconds.
End-fire array using three rows of subwoofers. Each row is delayed a few milliseconds more than the previous row.
Compound or 4th order band-pass enclosure

In 1933, the head of MGM's sound department, Douglas Shearer, worked with John Hilliard and James B. Lansing (who would later found Altec Lansing in 1941 and JBL in 1946) to develop a new speaker system that used a two-way enclosure with a W-shaped bass horn that could go as low as 40 Hz. The Shearing-Lansing 500-A ended up being used in "screening rooms, dubbing theaters, and early sound reinforcement".