AP audio analyzers provide more connectivity options with higher performance specifications than any other analyzer in the world. Every interface option is fully integrated into our software, eliminating uncertainty and inconvenience for faster test setup, unique measurement views and results trusted everywhere.

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Technical Library

The Audio Precision collection of Technotes, Knowledge Base articles and Whitepapers is an indispensable audio resource.


Measuring Switch-mode Power Amplifiers

Switching frequencies in Class D amplifiers can produce misleading results unless effective measures are taken to prevent them.

Measuring Power Supply Rejection Ratios

Two different methods to measure PSRR are described and compared. Instructions for using the APx PSRR Measurement Utility are provided.

Testing Smartphones and Tablets

Smartphones and tablets contain many audio paths, including headphones, speakers, HDMI and Bluetooth. For speech, perceptual tests such as PESQ are required. This article shows how all of these can be measured with APx analyzers.

Measuring PDM Microphones and Inputs

Pulse Density Modulation (PDM) is widely used in digital MEMS microphones. This article demonstrates direct measurement and analysis of the PDM audio and datastream using APx analyzers.

APx Digital Interfaces

In addition to high performance analog I/O and standard AES/EBU, APx audio analyzers support a wide variety of digital options.



Bluetooth option with built-in radio and support for A2DP, HFP, AVRCP profiles and SBC, CVSD and aptX codecs.

Digital Serial

Direct connection at chip level. I2S and up to 16 channels of TDM with support for left justified, right justified, and DSP formats.


Direct I/O with modulation and decimation of PDM audio for testing of MEMS microphones, with a wide range of oversampling rates.


Measure HDMI audio quality and audio format compatibility on set-top boxes, home theater receivers, HDTVs, smartphones and Blu-ray Disc™ players.


Make direct measurements of high quality and professional PC audio interfaces with APx500's built-in direct ASIO connectivity.

Software Downloads & Demos

AP measurement software can be run without an analyzer in Demo Mode for evaluation, training or offline test editing.



APx500 control software for the APx audio analyzers. APx500 is the most advanced and intuitive audio measurement software in the world.


AP2700 control software for the 2700 Series audio analyzers. Supports Windows 7 64-bit and connects via USB with the APIB-USB interface.


For a complete demonstration of how AP can help you in your work, click the link above. Your local AP Sales Partner will contact you.