Audio Precision has released the Loudspeaker Production Test suite for loudspeaker driver production test and final QA. The package is aimed munufacturers of integrated products such as powered speakers, sound bars and smartphones.
In less than one second, the Loudspeaker Production Test measurement returns multiple results – rub and buzz, impedance magnitude and phase, key Thiele-Small parameters, SPL, frequency response, phase and distortion (either total or specific harmonics). Polarity can be evaluated with the built-in phase measurement, or by a separate 0.5s measurement. If required, air leak detection is measured in a further 0.5s measurement. All normal APx functionality, including one-click automation and automated reporting, are available.
In addition to the Loudspeaker Production Test suite, a new R&D suite has also been released. The Impedance/ Thiele-Small measurement enables complex impedance and full Thiele-Small parameters. Waterfall (CSD) and polar plots have also been added. With this extended electro-acoustic functionality, APx is aimed at R&D groups working on different sections of a device (such as power amplification, Bluetooth, HDMI, DSP and loudspeakers) can share APx projects and results seamlessly, then send a single, lockable test sequence with limits and reports to manufacturing.
An APx analyzer is required to run the measurements. All models support the below options.
• APX-SW-SPK-PT (for production test): Frequency response, relative level, phase, distortion product ratio, distortion product level, rub and buzz, impedance magnitude, impedance phase, select Thiele-Small parameters and modulated noise. (US $750)
• APX-SW-SPK-RD (for R&D): Impedance magnitude, impedance phase, real impedance, imaginary impedance, complete Thiele-Small parameters, energy time curve, impulse response, frequency response, relative level, phase, distortion product ratio, distortion product level, rub and buzz, and modulated noise. Includes all measurements in the loudspeaker production test measurement detailed below and polar plots and waterfall (CSD) graph utilities. (US $1,500)