APx585 audio tester

Audio Precision, www.ap.com

The APx585 redefines ease of use for testing devices such as cell phones and MP3 players. It has eight analog audio inputs and eight analog outputs, and it supports eight channels of digitized audio. The APx585 performs up to 14 measurements in 10 s. Measurements include frequency response, total harmonic distortion plus noise, crosstalk, signal-to-noise ratio, and interchannel phase.

Windows software lets you develop custom test sequences in which you select any or all measurements. You can set limits for any measurement and see results in real time. Test results include a time or frequency plot and a bar graph that shows test results for each channel. A PC screen can also show the list of measurements and settings for the current measurement.