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Audio tester boasts extremely low noise, distortion

11 Sep 2014

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Audio Precision has unleashed what the company boasts as the most powerful and capable audio test instrument in the market. The APx555 outperforms the Audio Precision SYS-2700 series, the previous leader in analogue audio performance, added the company.

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.

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

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


In conjunction with the APx555 introduction, Audio Precision is releasing the APx500 v4.0 software, which provides a multi-mode user interface for the entire APx family of analysers. 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.

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 (1bit oversampled) formats. The APx555 provides a full range of AES3 and S/PDIF digital output impairments, including jitter generation and analysis. An advanced master clock handles input and output clock signals to synchronise the APx555 with external equipment.

The APx series uses a modular architecture that supports a 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.

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