Despite its low cost, the Audio Precision APx515B Series is a best-in-class two-channel audio analyzer optimized for production test and entry-level R&D. It offers a powerful combination of speed, performance, automation, reliability and ease of use, with a typical THD+N of −106 dB, 1M-point FFTs and digital I/O.

The APx515B operates either as a stand-alone test unit with its own user interface, or it can be controlled by a master .NET or LabVIEW application. An operator can control it with a keyboard, foot switch or barcode scanner, or the system can be totally automated. Switchers and external devices such as pass/fail lights are also supported.