Audio Precision Sets New Performance Standard with APx555 Audio Analyzer

Created on 2014-09-09 14:58:00


Lowest residual THD+N in the world provides audio professionals unparalleled insight into their designs

BEAVERTON, OREGON, September 9, 2014: Audio Precision, the recognized standard in audio test, announces the availability of the finest audio analyzer to date, the APx555. A culmination of 30 years of experience, the APx555 is the most powerful and capable audio test instrument ever developed.

The APx555 outperforms the legendary Audio Precision SYS-2700 series, the previous leader in analog audio performance. Leveraging the modular architecture and powerful software of the APx family, the APx555 delivers improved measurement accuracy, speed, flexibility, automation and ease-of-use for developers of audio components, equipment and systems.

Unmatched analog performance

With a typical residual THD+N of -120 dB (conservatively specified at -117 dB), the two analog channels of the APx555 boast the lowest noise and distortion of any audio analyzer ever made, allowing the most sensitive measurements to be made with assurance. This extraordinary performance is coupled with
1 MHz bandwidth (mono) and an industry-leading FFT resolution of 1.2 million points. The generator is capable of producing low distortion sine wave signals up to 204 kHz, at high-level amplitudes
up to 26 Vrms.

The APx555 offers audio developers previously unachievable insight into the behavior of their designs, unimpaired by noise or artifacts from the test system.

“The APx555 represents a lifetime of work in audio test,” says AP co-founder and Chief Analog Designer, Bruce Hofer. “It pushes analog circuit design to the edge of understanding and accounts for many previously unseen anomalies, achieving real, measurable performance that exceeds any other.”

Flexible operation, broad digital I/O support

In conjunction with the APx555 introduction, Audio Precision is releasing the new APx500 v4.0 software, which provides a multi-mode user interface for the entire APx family of analyzers. Developed with system flexibility in mind, the software allows easy switching between Sequence Mode – the fast and efficient menu of measurements with which APx users worldwide are familiar – and Bench Mode,  a SYS-2700 series-inspired approach that delivers real-time feedback of any selected parameters, including waveform scope, FFT spectrum, levels, frequency, THD+N, and more. Engineers may choose the mode that best suits their needs with a click of a mouse button.

“Bench Mode offers more visibility into real-time behaviors.” says Eric Cline, Engineering Technician at Analog Devices. “Being able to see everything at once is a huge deal – distortion, noise, and signal level on meters is incredibly important. It definitely answers my requests, offering the best of both of worlds. You have the APx ease-of-use, but can still have all the measurements, all on one screen, when you need it.”

Regarding digital I/O, AES3 and S/PDIF are standard to the APx555, with the instrument also supporting the entire range of APx options, allowing native connectivity and analysis of audio via Bluetooth, HDMI, Digital Serial (I2S, TDM) and PDM (1-bit oversampled) formats.  The APx555 provides a full range of AES3 and S/PDIF digital output impairments, including jitter generation and analysis. A new Advanced Master Clock handles input and output clock signals to synchronize the APx555 with external equipment.

The evolution of audio test

The APx series uses a modular architecture that supports a wide range of digital I/O, ensuring that as formats change APx options will be ready to support the audio industry. APx500 measurement software is under constant development, keeping pace with new standards and methods in audio test.

“We are incredibly proud of the APx555 and APx500 v4.0 software,” adds AP President David Schmoldt. “The APx family covers every audio test need from high-speed production to the most refined and demanding research and development, and it is ready for whatever changes the industry may bring. Only AP could deliver such an uncompromising package of world-class performance, flexibility, speed and ease-of-use for the audio professionals we serve.”

About Audio Precision

Audio Precision is the recognized standard in audio test. Since 1984, AP has offered high performance audio analyzer instruments and applications to help engineers worldwide design and manufacture all types of consumer, professional and industrial audio products. For more information, visit