Submit Samples to Voice Coil’s Test Bench

Test Bench is an open forum for driver manufacturers. All OEMs are invited to submit samples to Voice Coil for inclusion in the Test Bench column. Here’s how.

Studio Six Digital has been building professional-grade audio apps for iOS devices since Apple’s App Store opened. Continuing to look for ways to explore the iOS platform in the world of professional audio, Studio Six created a Type 1 class test & measurement microphone that plugs directly into any Lightning-connector.

The maker of highly acclaimed planar magnetic driver headphones such as the LCD-3 and LCD-XC has selected Audio Precision audio analyzers to test products during development and production. APx series matched the range and accuracy demanded in cutting edge tests for Audeze’s advanced electro-acoustics products.

In this article, George Ntanavaras describes the design and operation of a system consisting of the ACH-01 accelerometer and a preamplifier with an integrated analog signal processor. With this system, it will be possible to measure at the low frequencies the acceleration, the velocity, and the excursion of a loudspeaker cone. Also the panel vibrations of a loudspeaker cabinet will be very easily obtained. Originally published on audioXpress June 2011.

Charles Hansen described a DIY phase meter calibrator using all-pass, phase-shift filters in a November 2006 article published in audioXpress magazine. Being able to measure phase angle is often helpful, so Ron Tipton decided to build the calibrator as described. In Hansen's design, there was a set of five calibrations frequencies: 10 Hz, 100 Hz, 1000 Hz, 10 kHz, and 100 kHz. Hansen relied on an external oscillator to drive the calibrator at these input frequencies. Ron Tipton made some modifications that better suited his needs, described in this article.