Voice Coil

Voice Coil February 2018

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IN THIS ISSUE V O L U M E 3 1 , I S S U E 4 F E B R U A R Y 2 0 1 8 1 INDUSTRY NEWS & DEVELOPMENTS By Vance Dickason 6 DIRECTORY Loudspeaker Cone Industry Suppliers 2018 By Mike Klasco 14 ACOUSTIC PATENTS By James Croft 20 TEST BENCH Precision Devices' New 1.4" Titanium Diaphragm Compression Driver Plus Wavecor's New 10" PA Woofer By Vance Dickason 29 INDUSTRY WATCH By Vance Dickason New Turntable from HEAD acoustics HEAD acoustics has released the HRT I (HEAD acoustics Remote-operated Turntable), a high-precision turntable (see Photo 1). With HRT I, users can perform automated, orientation-dependent acoustic measurements. With the help of the turntable, for example, telephones, televisions with pedestals, (video) conference systems, loudspeakers, and measurement equipment (e.g., the HMS artificial head measurement system with torso box) can be rotated to specific angles. The rotation unit of the turntable offers a 360° rotation range, which can be approached in 0.1° steps. The adjusted angles can be reproduced to an accuracy of 0.02°. HRT I can be manually operated via buttons on the turntable's front panel. This enables users to set an absolute reference position (0° position) and rotate the turntable clockwise or counter-clockwise. In addition to the manual control, users can automatically control the HRT I via the communication analysis system ACQUA to conduct fully automated measurements. Based on the RS485 interface, data transmission over long distances is possible. The turntable has a sturdy design: test objects up to 50 kg can be precisely aligned. HRT I is also designed so that it does not generate any noise in the measurement position. Only during rotation is there low noise emission. For more information, visit the HEAD acoustics website at www.head-acoustics.de. Photo 1: HEAD acoustics' HRT I is a high-precision turntable for automated, orientation-dependent acoustic measurements. Industry News & Developments

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