JBL Professional White Paper New 4675C-HF with 2360B • New High-Frequency Assembly with new Horn and Bracket • Resonances Controlled by JBL Patent Pending CoMolding Process • Improved Amplitude and Time/Phase Response • Precise Horizontal and Vertical Pattern Control • New Bracket Design Simplifies Assembly and Adjustment
2360B Attributes JBL continuously pursues new materials and processes for both new products, and to improve existing products. An example is the 2360B re-designed to provide better and more consistent performance by utilizing close tolerance molding technology and materials. JBL developed a patent pending co-molding process to apply SMC technology to acoustic applications. SMC (Sheet Molding Compound) is a molding process developed and used extensively by the automotive industry. The results are not only a more “finished” appearance, but also include more precise dimensions that provide improved, more uniform, pattern control and frequency response. The following measurements compare the aluminum throat, fiberglass bell version of the 2360A with the new all SMC 2360B. All measurements were taken under identical conditions. 2360A Frequency Response
2360B Frequency Response
Note both the frequency response and impedance are smoother.
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2360A Beamwidth
2360B Beamwidth
These Beamwidth curves show the new horn has much improved vertical control in the 600Hz to 1.2kHz range. The horizontal coverage maintains control to the highest frequencies. 2360A Directivity and “Q”
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2360B Directivity and “Q”
The improved coverage of the new horn is seen as more linear DI at 1 kHz and above 10 kHz. Impulse Response 2360A
2360B
These are the impulse response measurements for the old, and new horns. The vertical scale is linear to show better damping (less ringing). 4
2360A Horizontal On and Off axis Frequency Response
2360B Horizontal On and Off axis Frequency Response
These curves show the horn’s ability to provide pattern control to the highest frequencies. 2360A Vertical On and Off axis Frequency Response
2360B Vertical On and Off axis Frequency Response
Between 500 Hz and 3 kHz shows much more uniform off axis response. 5
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