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JBL

JBL is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand JBL rather than just read about it. In short: JBL is an American audio equipment manufacturer headquartered in Los Angeles, California. The company was founded in 1946 by James Bullough Lansing, an American audio engineer and loudspeaker designer.

JBL — main illustration
JBL — illustration

Key takeaways

  • JBL belongs to computer science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect JBL to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of JBL from memory before moving on to harder problems.

Reference excerpt

JBL is an American audio equipment manufacturer headquartered in Los Angeles, California. The company was founded in 1946 by James Bullough Lansing, an American audio engineer and loudspeaker designer. JBL currently serves the home and professional audio markets. Their home products include home audio speakers, waterproof Bluetooth speakers, and car audio. Their professional products include live PA systems, studio monitors, and loudspeakers for cinema. JBL is a subsidiary of Harman International, which is owned by Samsung Electronics.

History James Bullough Lansing and his business partner Ken Decker started a company in 1927 in Los Angeles, manufacturing six-and-eight-inch (150 and 200 mm) speaker drivers for radio consoles and radio sets. The firm was named Lansing Manufacturing Company, from March 1, 1927. In 1933, head of the Metro-Goldwyn-Mayer (MGM) sound department, Douglas Shearer, dissatisfied with the loudspeakers of Western Electric and RCA, decided to develop his own. John Hilliard, Robert Stephens, and John F. Blackburn were part of the team that developed the Shearer Horn, with Lansing Manufacturing producing the 285 compression driver and the 15XS bass driver. The Shearer Horn gave the desired improvements, and Western Electric and RCA received the contracts to each build 75 units. Western Electric named them Diaphonics, and RCA used them in their RCA Photophones. Lansing Manufacturing was the only firm selling them as Shearer Horns. In 1936, the Shearer Horn received the Academy Scientific and Technical Award from the Academy of Motion Picture Arts and Sciences.

Based on the experience developed with the Shearer Horn, Lansing produced the Iconic System loudspeaker for cinemas. The Iconic was a two-way speaker using a 15-inch (380 mm) woofer for low frequencies and a compression driver for high frequencies. In 1939, Decker was killed in an airplane crash. The company soon began having financial troubles. In 1941, Lansing Manufacturing Company was bought by Altec Service Corporation, after which the name changed to "Altec Lansing." After Lansing's contract expired in 1946, he left Altec Lansing and founded Lansing Sound, which later changed to "James B. Lansing Sound" and was further shortened to "JBL Sound." In 1946, JBL produced their first products, the model D101 15-inch loudspeaker and the model D175 high-frequency driver. The D175 remained in the JBL catalog through the 1970s. Both of these were near-copies of Altec Lansing products. The first original product was the D130, a 15-inch transducer for which a variant remained in production for the next 55 years. The D130 featured a 4-inch (100 mm) flat ribbon wire voice coil and Alnico V magnet. Two other products were the 12-inch (300 mm) D131 and the 8-inch (200 mm) D208 cone drivers. The Marquardt Corporation gave the company early manufacturing space and a modest investment. William H. Thomas, the treasurer of Marquardt Corporation, represented Marquardt on Lansing's board of directors. In 1948, Marquardt took over the operation of JBL. In 1949, Marquardt was purchased by General Tire Company. The new company, not interested in the loudspeaker business, severed ties with Lansing. Lansing was reincorporated as James B. Lansing and moved the newly formed company to its first private location, on 2439 Fletcher Drive, Los Angeles. A key to JBL's early development was Lansing's close business relationship with its primary supplier of Alnico V magnetic material, Robert Arnold of Arnold Engineering. Arnold saw JBL as an opportunity to sell Alnico V magnetic materials into a new market. Lansing was noted as an innovative engineer but a poor businessman. Decker, his business partner, had died in 1939 in an airplane crash. In the late 1940s, Lansing struggled to pay invoices and ship products. Possibly as a result of deteriorating business conditions and personal issues, he committed suicide on September 4, 1949. The company then passed into the hands of Bill Thomas, JBL's vice president. Lansing had taken out a US$10,000 life insurance policy, naming the company as the beneficiary, a decision that allowed Thomas to continue the company after Lansing's death. Soon after, Thomas purchased Mrs. Lansing's one-third interest in the company and became the sole owner. Thomas is credited with revitalizing the company and spearheading a period of strong growth for the two decades following the founding of JBL. Early products included the model 375 high-frequency driver and the 075 ultra-high frequency (UHF) ring-radiator driver. The ring-radiator drivers are also known as "JBL bullets" because of their distinctive shape. The 375 was a re-invention of the Western Electric 594 driver but with an Alnico V magnet and a four-inch voice coil. The 375 shared the same basic magnet structure as the D-130 woofer. JBL engineers Ed May and Bart N. Locanthi created these designs. Two products from that era, the Hartsfield and the Paragon, continue to be highly desired on the collectors' market. In 1955, the brand name JBL was introduced to resolve ongoing disputes with Altec Lansing Corporation. The company name, "James B. Lansing Sound, Incorporated," was retained, but the logo name was changed to JBL with its distinctive exclamation point. The JBL 4320 series studio monitor was introduced through Capitol Records in Hollywood and became the standard monitor worldwide for its parent company, EMI. JBL's introduction to rock and roll music came via the adoption of the D130 loudspeaker by Leo Fender's Fender Guitar Company as the ideal driver for electric guitars.

… excerpt ends here. Continue reading the full article.

Illustrations

JBL illustration
JBL: Lansing Iconic System loudspeaker for cinemas
Lansing Iconic System loudspeaker for cinemas
JBL: JBL store at South China Mall in Dongguan, China
JBL store at South China Mall in Dongguan, China
JBL: JBL flagship store at SM City Cebu in Cebu City, Philippines
JBL flagship store at SM City Cebu in Cebu City, Philippines

Worked examples

Example 1 — a first encounter with JBL

Start with the simplest possible case. Write down what JBL claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to JBL before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about JBL ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of JBL

In research
JBL appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses JBL in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
JBL is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1946 establishments in California, Audio amplifier manufacturers, Audio equipment companies, so understanding it makes those chapters shorter.
In everyday life
Look for JBL outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study JBL in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what JBL means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain JBL out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is JBL in simple terms?

JBL is an American audio equipment manufacturer headquartered in Los Angeles, California. The company was founded in 1946 by James Bullough Lansing, an American audio engineer and loudspeaker designer.

Why does JBL matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study JBL?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on JBL.

Tags

  • 1946 establishments in California
  • Audio amplifier manufacturers
  • Audio equipment companies
  • Audio equipment manufacturers of the United States
  • Computer hardware companies
  • Computer peripheral companies
  • Harman International
  • Headphones manufacturers
  • In-car entertainment
  • JBL
  • Loudspeaker manufacturers
  • Manufacturers of professional audio equipment

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