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APx555 Audio AnalyzerHOME/PRODUCTS/APx SERIES/APx555

High-Performance, Modular 2-Channel
Audio Analyzer

The New Standard - the highest performance and most versatile audio
analyzer ever made

APx555 Audio Analyzer

A culmination of 30 years' experience making test equipment recognized as the standard of the audio industry, the APx555 is a two-channel audio analyzer without compromise. Developed for R&D engineers and production technicians who need the highest possible performance, a broad range of digital I/O options and fast, intuitive software, the APx555 is the new standard for audio analyzers.

The perfect evolution of audio analysis

The APx555 delivers performance, flexibility and versatility.

Unprecedented performance
With a typical residual THD+N of -120 dB and over 1 MHz bandwidth, the APx555 surpasses the analog performance of all other audio analyzers, including a 5 dB improvement compared to our 2700 Series analyzer. Add to this FFTs of 1.2 million points and full 24-bit resolution, and you have performance unmatched by any other instrument.

Maximum versatility in I/O
APx555 has two balanced and two unbalanced analog inputs and outputs plus 216k digital inputs and outputs via AES/EBU, TOSLINK and SPDIF. Additionally, I/O may be expanded with optional Digital Serial, HDMI with ARC, PDM and Bluetooth modules. A new Advanced Master Clock (AMC) module handles input and output clock signals to synchronize the APx555 with external equipment (or vice versa), and the AMC also enables jitter generation and analysis. AMC is standard with the APx555 and is an option for the APx52x Series and APx58x Series Audio Analyzers.

Software flexbility
With its redesigned software platform, the powerful APx Audio Analyzer Series provides never-before-seen flexibility and usability. The bold new interface offers users two easy-to-use modes. Choose between Sequence Mode for fast production testing and automated measurements, and Bench Mode for real-time visibility into device behavior across a variety of parameters.

Made to measure for power amp designers
Measure continuous maximum output and peak maximum output automatically, DIM measurements, view power spectrum graphs with a regulated frequency sweep and take other measurements as specified by the CEA-2006 and CEA-490A standards. In addition to conventional balanced common mode rejection measurements, APx555 also enables CMRR measurements in accordance with IEC60268 section 14.15.1.

Sharing projects
All settings for a test are saved in a single project file that’s small enough to email, making it easy to replicate test setups between R&D and production facilities anywhere in the world. Project files are compatible with all APx instruments and each project is self-contained, so there’s never any worry about dependencies or broken links.

Reporting results
For customers, contract manufacturers or management, APx automatically generates rich graphic reports, with highlighted pass / fail limits and options to export as PDF, HTML, Excel or text.

High performance

  • –120 dB Typical THD+N
  • Up to 216k digital connectivity
  • Supports legacy AP switchers

Easy automation

  • Automation without a single line of code with Sequencer
  • VB.NET, C#.NET, MATLAB, and LabVIEW support in API
  • Read more ...


What others are saying

APx555 selected to EDN's Hot 100 of 2014

“Bench Mode offer[s] more visibility into real-time behaviors. Being able to see everything at once is a huge deal - distortion, noise, signal level on meters is incredibly important. [And] it's good for quick iterations and troubleshooting.”
-- Eric Cline | Analog Devices

Ideal for testing

The APx555 Audio Analyzer is the choice for most high-performance analog and digital audio applications (see list below), surpassing the performance of the 2700 Series, while offering the digital I/O options and software flexibility of the APx Series.

  • Converter (ADC / DAC) design
  • Power amps
  • Pro audio equipment design and manufacturing
  • Digital Interfaces






    Download full specifications -->

  • Sine Frequency Range
    0.001 Hz to 80 kHz, DAC
    5 Hz to 204 kHz, Analog
  • Frequency Accuracy
    3 ppm, DAC
    0.35%, Analog (10 Hz to 100 kHz)
  • IMD Test Signals
  • Maximum Amplitude (balanced)
    26.66 Vrms
  • Amplitude Accuracy
    ±0.03 dB
  • Flatness (5 Hz–20 kHz)
    ±0.008 dB
  • Residual THD+N (22 kHz BW)
    –117 dB + 1.0 µV
    Typically < -120 dB (1 kHz, 2.0 V)
  • Analog Output Configurations
    Unbalanced, balanced or CMTST
  • Digital Output Sampling Rate
    27 kS/s to 200 kS/s
    27 kS/s to 108 kS/s Optical
  • Dolby / dts Generator
    Yes (encoded file)
  • Maximum Rated Input Voltage
    230 Vpk
  • Maximum Bandwidth
    > 1 MHz
  • IMD Measurement Capability
  • Amplitude Accuracy (1 kHz)
    ±0.03 dB
  • Amplitude Flatness (10 Hz–20 kHz)
    ±0.008 dB
  • Residual Input Noise (22 kHz BW)
    ≤1.0 µVrms
  • Residual THD+N (20 kHz BW)
    –117 dB + 1.0 µV
    Typically < -120 dB (1 kHz, 2.0 V)
  • Individual Harmonic Analyzer
  • Max FFT Length
    1248K points
  • DC Voltage Measurement

  • PC with 2 GHz or faster multi-core processor (2 or more cores)
    Note: the Intel Atom dual-core processor does not have sufficient performance to run APx software.
  • 2 GB or more RAM (4 GB or more recommended for Windows 7/8).
  • Microsoft Windows XP (32-bit, SP 2 or later), Windows Vista (32-bit), Windows 7 (32- or 64-bit), Windows 8 (32- or 64-bit).
  • Download System Requirements Document
  • System performance is sensitive to processor speed; faster processors will yield faster results.
  • APx500 is data intensive and it is recommended that other data-intensive applications not be run concurrently. This includes Audio Precision AP2700, APWIN or ATS.
  • We recommend and support the following specific editions of Microsoft Windows: XP Professional SP2 and SP3, Vista Business and Ultimate, Windows 7 Professional and Ultimate (32- and 64- bit), Windows 8 Pro and Enterprise (32- and 64-bit).

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