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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. [4]
American EIA standard RS-299A specifies that (or DCR) should be at least 80% of the rated driver impedance, so an 8-ohm rated driver should have a DC resistance of at least 6.4 ohms, and a 4-ohm unit should measure 3.2 ohms minimum. This standard is voluntary, and many 8-ohm drivers have resistances of ≈5.5 ohms, and proportionally lower for ...
The drivers were vertically aligned so they would acoustically couple with the cabinets above and below them. The driver selection evolved over time generally keeping with the all JBL design. The 4-way design used a 3-way active cross over with 200 Hz and 1,200 Hz crossover points initially powered by Phase Linear 700 amplifiers.
In 1983, financial and quality control problems at Altec led UREI to introduce the 813B, which utilized JBL loudspeaker drivers. [7] [6] JBL-UREI co-branding (1985 to 1987) Putnam sold UREI to Harman in 1983, and UREI became a division of JBL Professional. [6] Harman began releasing "JBL-UREI" co-branded products such as the 5547A graphic ...
Loudspeaker acoustics is a subfield of acoustical engineering concerned with the design of loudspeakers. [1] It focuses on the reproduction of sound and the parameters involved in doing so in actual equipment.
The JBL Paragon, measuring almost 9 feet (2.7 m) from left to right. The JBL D44000 Paragon is a one-piece stereo loudspeaker created by JBL that was introduced in 1957 and discontinued in 1983; its production run was the longest of any JBL speaker. [1] At its launch, the Paragon was the most expensive domestic loudspeaker on the market. [2]
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The loudspeaker driver's moving mass and compliance (slackness or reciprocal stiffness of the suspension) determines the driver's resonance frequency (F s). In combination with the damping properties of the system (both mechanical and electrical) all these factors affect the low-frequency response of sealed-box systems.
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