Overview – APx Audio Analyzers & Measurement Software

APx586 B Series Audio Analyzer Sixteen-Channel Modular Audio Analyzer
APx555 B Series High-Performance, Modular Two-Channel Audio Analyzer
APx525 B Series Modular, Two-Channel Performance Audio Analyzer
APx515 B Series Two-Channel Performance Audio Analyzer for Production Test and entry-level R&D
APx500 Flex Audio Analyzer & Flex Key


The APx Audio Measurement Platform: A versatile, powerful audio test experience

With industry-leading analog performance and a wide range of digital I/O options, the APx B Series audio analyzers represents the state of the art in audio test hardware, with configurations to suit every need from R&D to high-speed production test. This highly-capable hardware is complemented by the flexible and intuitive APx500 audio measurement software, offering a multi-mode UI, code-free automation, and a host of application-specific software options. For measurement scenarios where hardware performance requirements are secondary to test system price—such as production line test of speakers, headphones and microphones—the APx500 Flex audio analyzer enables the use of APx audio measurement software with ASIO-capable third-party audio interfaces or sound cards. All of which combines to make APx the most powerful and versatile audio measurement platform we’ve ever produced.


Measurement Performance and Speed

With typical residual THD+N specifications ranging from -106 dB (APx515) to -120 dB (APx555), APx B Series audio analyzers deliver the analog performance needed by designers and production test engineers around the globe. Add in FFTs of 1.2 million points and full 24-bit resolution, and you have unmatched performance for audio test.

Maximum Versatility in I/O

Each APx B Series audio analyzer has high precision analog audio inputs and outputs and, except for the APx511, includes 216k digital inputs and outputs via AES/EBU, TOSLINK and SPDIF. Additionally, I/O may be expanded for the APx555, APx52x Series and APx58x Series analyzers with optional Digital Serial, HDMI with ARC, PDM and Bluetooth modules. Finally, the Advanced Master Clock (AMC) module handles input and output clock signals to synchronize AMC-equipped analyzers with external equipment (or vice versa), and enable jitter generation and analysis.

Bench Mode & Sequence Mode

APx500 audio measurement offers two easy-to-use modes: Bench Mode and Sequence Mode. For fast, code-free automation, Sequence Mode allows users to add defined measurements to a navigation tree, and then run this series of measurements in an automated procedure called a Sequence. This is especially effective in production or manufacturing test applications.

In Bench Mode the user is provided a configurable generator and analyzer, a broad family of meters, a comprehensive sweep engine, a time recorder and implementations of the APx Signal Analyzer, Continuous Sweep and Acoustic Response measurements, all to deliver greater flexibility for real-time visibility into device behavior.

APx500 audio measurement software demonstrating Bench Mode (l) and Sequence Mode (r)
Side-by-side examples of Bench Mode and Sequence Mode in APx500 audio measurement software

Code-Free Automation and a Complete API

APx500 Measurement Software is the most advanced audio measurement interface available. Complex procedures that include user prompts, limits, and calls to external applications can be created directly in the GUI, saving time and money while ensuring painless updates over time, as no development is required.

Create custom interfaces and application-to-application automation using the comprehensive APx API. Extensive documentation and examples are provided for Visual Basic.NET, C#, MATLAB, LabVIEW, and Python. Projects and automation can be shared with other APx units anywhere in the world.

Scalable, Flexible Software

While the APx500 audio measurement software that ships with each instrument is powerful in its own right, Audio Precision offers a wide range of options tailored to specific applications, including:

Electro-acoustic testing (R&D or Production)
Perceptual audio test: POLQA and PESQ
Speech Intelligibility: ABC-MRT measurement
Speech Intelligibility: STI measurement

Common Software Platform

From a practical perspective, APx audio analyzers use a common software platform, making tests and results easier to share. All settings for a test are saved in a single project file, making it easy to replicate test setups between R&D and production facilities anywhere in the world. Project files are compatible with both B Series and Legacy APx instruments and each project is self-contained, so there’s never any worry about dependencies or broken links. Users can even embed waveform files and images within a project file.

For sharing measurement results with customers, contract manufacturers or management, APx automatically generates rich graphic reports, with highlighted pass / fail limits and options to export as PDF, HTML, Excel, CSV, RTF or MATLAB files.

Software Licensing

As of November 30, 2020, version 7.0 is the current release of APx500 audio measurement software, and begins shipping with all new APx audio analyzers in December. New analyzers include one year of software maintenance, licensing that instrument for APx version 8.0 when it is released, as well as any minor releases that occur between versions 7.0 and 8.0. Release 7.0 is compatible with all analyzers in the APx500 Series, however an APx KeyBox is required to run v7.0 on Legacy APx analyzers.

For current owners of APx analyzers (whether Legacy or B Series), licensing v7.0 software is available via upgrades or maintenance (both providing perpetual licenses) or via subscription (providing time-limited licenses). Please see the links below for further information, or contact your local Audio Precision sales engineer or partner.

APx Software Subscriptions
Software Licensing FAQ
Find Your Local AP Representative