Lansing's tight commercial connection with its major source of Alnico V magnetic material, Robert Arnold of Arnold Engineering, was critical to JBL's early growth. Lansing was given advantageous conditions and a large credit line by Arnold Engineering. JBL presented Robert Arnold with a chance to sell Alnico V magnetic material into a new market. The type 375 high-frequency driver and the 075 UHF (Ultra High Frequency) ring-radiator driver were early products. Because of their unique form, ring-radiator drivers are often referred to as "JBL bullets." The 375 was a redesigned Western Electric 594 driver featuring an Alnico V magnet and a four-inch voice coil. The D-130 woofer's fundamental magnet construction was shared by the 375. These designs were produced by JBL engineers Ed May and Bart N. Locanthi. JBL's consumer (Northridge) line of loudspeakers became more mass-market during the following two decades. Simultaneously, they entered the high-end market with its project speakers, which included the Everest and K2 lines. JBL sprang to prominence as a tour sound supplier, with its loudspeakers used by traveling rock groups and music festivals. JBL devices served as the foundation for the creation of the THX loudspeaker standard, resulting in JBL being a well-known manufacturer of cinema loudspeakers. JBL was once utilized in Ford's top-tier vehicle audio systems to compete with Chrysler (whose cars used Infinity) and Nissan (who used Bose). Toyota now employs JBL