Micro Suspension Part Measurements

This Spotlight reference article details a simple and fast procedure for testing the diaphragm used in microspeakers, headphones, tweeters, and microphones. Meaningful information comparable to Stiffness KMS and Mechanical Resistance RMS of the Thiele-Small (T-S) parameters is the basis for tuning the production process and for communication between transducer manufacturers and soft parts suppliers. This article was originally published in Voice Coil, January 2016.

Voice Coil September 2016 features an overview article of KLIPPEL’s QC Version 5 loudspeaker testing system. In Acoustic Patents, James Croft reviews a recently granted patented on Inverse Horn Loudspeakers, which is the third patent granted on Atlantic Technology’s H-PAS (High Pressure Acceleration System) low-frequency system. In this month’s Test Bench, Vance Dickason characterizes the DE990TN-8 1.4” driver from B&C Speakers and the GBS-135F25AL02-04 midbass driver 5.25” woofer from Tymphany.

For 2016, our annual Loudspeaker Industry Sourcebook (LIS 2016) directory has gained an entirely new dimension. The online directory was updated and contains complete listings and category indexes, which make this annual publication such an invaluable resource for the industry. In this edition, readers will also find a complete series of must-read articles for anyone in the audio industry: feature articles, industry reports, and company profiles, as well as our annual query about the state of the industry, with contributions from distinguished market executives and professionals.

Recently, there has been increased demand for loudspeaker 3-D directivity measurements both in the near- and far-fields for different applications. New holographic near-field scanning techniques provide new ways to determine the sound pressure at any point in the 3-D sound field. This article was originally published in Voice Coil, May 2015.

Get your agenda ready for the 2016 National Association of Music Merchants (NAMM) Show in Anaheim, CA, and the Integrated Systems Europe (ISE) trade show, being held February 9–12, 2016, in Amsterdam. Read about a new transducer technology from Christianson Audio, and a great reference article on “Micro Suspension Part Measurements.” This month’s Test Bench characterizes a high-end 5.25” mid-bass driver from Motus Audio and a Pro Sound 10” woofer from MAG.

This Test Bench analysis discusses Celestion CF1840JD pro sound 18” woofer. The CF1840JD is a fairly high power handling woofer rated at 1,000 WRMS (AES standard), featuring a substantial ferrite finite element analysis (FEA) optimized motor assembly, an 18” Kevlar-loaded paper cone and large 5.5” diameter paper dust cap. This article was originally published in Voice Coil, December 2014.

Acoustic design and measurement firm Warkwyn, recently acquired by US OEM speaker manufacturer MISCO, announced that it has completed the relocation of all operations from Ontario, Canada to Minneapolis and is now fully operational. The company also announced that its role as North American sales and training agent for Klippel GmbH has been renewed.

This interview was published in Voice Coil August 2013. Nearly 10 years since Patrick Turnmire, of Redrock Acoustics, had started providing Voice Coil with valuable Klippel data for Vance Dickason’s the Test Bench column. In this interview Patrick Turnmire explains his work with his company, Redrock Acoustics.

Loudspeaker defects caused by manufacturing, aging, overload, or climate impact generate a special kind of irregular distortion commonly known as rub & buzz, which is highly audible and intolerable for the human ear. This article, originally published in Voice Coil, June 2011, discusses how to measure and detect those defects.

This article discusses the physical causes of regular loudspeaker distortions, their modeling by using lumped and distributed parameters, the objective assessment using modern measurement techniques, and the perception by the human ear. Article originally published in Voice Coil, May 2011