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. In 1969, Thomas sold JBL to the Jervis Corporation (later renamed "Harman International"), headed by Sidney Harman. The 1970s saw JBL become a household brand, starting with the famous L-100, which was the bestselling loudspeaker model of any company to that time. The 1970s were also a time of major JBL expansion in the professional audio field from their studio monitors. By 1977, more recording studios were using JBL monitors than all other brands combined, according to a Billboard survey. The JBL L-100 and 4310 control monitors were popular home speakers. In the late 1970s, the new L-series designs L15, L26, L46, L56, L86, L96, L112, L150, and later the L150A and flagship L250 were introduced with improved crossovers, ceramic magnet woofers, updated midrange drivers, and aluminum-deposition phenolic resin tweeters. In the mid-1980s the designs were again updated and redesigned with a new titanium-deposition tweeter diaphragm. The new L-series designations being the L20T, L40T, L60T, L80T, L100T, the Ti-series 18Ti, 120Ti, 240Ti, and the flagship 250Ti. To test speaker drivers, JBL in Glendale and Northridge used the roof as an outdoor equivalent to an anechoic chamber. Over the next two decades, JBL went more mass-market with their consumer (Northridge) line of loudspeakers. At the same time, they made an entry into the high-end market with their project speakers, consisting of the Everest and K2 lines. JBL became a prominent supplier to the tour sound industry, their loudspeakers being employed by touring rock acts and music festivals. JBL products were the basis for the development of THX loudspeaker standard, which resulted in JBL becoming a popular cinema loudspeaker manufacturer. JBL was formerly used in Ford's top-of-the-line vehicle audio systems, as competition for Chrysler (whose cars used Infinity) and Nissan (who used Bose). Timeline 1902 – Birth of James B. Lansing in Illinois, U.S. 1927 – Founding of Lansing Manufacturing Company in Los Angeles 1934 – Douglas Shearer from MGM designs the first speaker for the cinema. Lansing