APx516B Series Audio Analyzer

Where quality meets affordability in analog & digital audio testing

With the proliferation of digital audio interfaces, there’s an increasing need for a straightforward, budget-friendly analyzer for both digital and analog audio testing. The APx516B Series Audio Analyzer offers a cost-effective modular solution for electronic audio customers, upholding the Audio Precision standard of performance and service. Designed for extended R&D teams and production test applications, the APx516B delivers comprehensive testing for analog and digital audio in a versatile, affordable package.



Affordable 2-Channel Audio Analyzer

The APx516B is a two-channel audio analyzer built for affordability and versatility:

  • 2 Analog Signal Generator Channels
  • 2 Analog Signal Analyzer Channels
  • Optional digital audio module

Audio Precision Quality & Reliability

The APx516B is designed to the same standards of precision, quality, and robustness as all other Audio Precision products:

  • 3-year standard warranty, or 5-year extended warranty
  • Accredited, ISO 17025 calibration from the factory
  • World-wide, direct support

Optional Digital Audio I/O

The APx516B is compatible with any current or future APx500 digital audio interface module:

  • Bluetooth
  • PDM 16
  • PDM
  • Digital Serial
  • HDMI

Use cases

Design Verification and Debug

The APx516B is a two-channel audio analyzer with an optional module slot. It combines analog and digital audio testing at a price point previously unavailable in the market. Using an Audio Precision analyzer ensures consistency across the entire product development process, especially for extended, distributed, and remote teams, eliminating the discrepancies often seen with makeshift or ad hoc approaches.

"Testing both analog and digital simultaneously is a game-changer for firmware and power engineers. Currently, they are all borrowing my AP and I want it back! We need a solution that’s both comprehensive and budget-friendly, especially with the rising demand for digital capabilities among our teams."

Product Design Engineer at a Leading Consumer Electronics Company

Streamlined Production Testing and Automation

The APx516B streamlines production testing with an end-of-line tester that seamlessly integrates both digital and analog signals. Directly compare data between R&D and manufacturing, make all key audio measurements in less than three seconds, and automate testing with a well-documented Application Programming Interface (API).

  • Automation support through .Net, Python, Labview, Matlab, and more
  • Robust hardware suitable for 24/7 operation on a manufacturing line
  • 3-year standard warranty, or 5-year extended warranty
  • Accredited, ISO 17025 calibration from the factory
  • World-wide, direct support

"Integrating both digital and analog inputs into a single end-of-line tester streamlines our production process. It eliminates the need to designate separate test lines for different amps, marking a significant advancement, especially for amplifiers and powered speaker testing."

Test Engineer at a Global Automotive Supplier



The APx516B is a two-channel audio analyzer built for versatility. It is compatible with any current or future APx500 digital audio interface module, including Bluetooth, PDM, Digital Serial, and HDMI.


AP’s Bluetooth module, the APx Bluetooth Duo™, delivers a wider selection of A2DP codecs, faster pair and connection times, an increased feature set within APx500 measurement software, and improved RF shielding for use in production test environments. APx Duo supports Bluetooth core specification v4.2, HFP v1.7, HSP v1.2, AVRCP v1.4 and A2DP v1.3.

PDM 16

The B Series APx PDM 16 option provides 16 acquisition channels for audio devices that have a PDM output (such as MEMS microphones). All 16 channels can be measured simultaneously. Cables are available in 2, 5, and 10 meters.


The B Series APx PDM option provides direct I/O, modulation, and decimation for powerful test and analysis of PDM devices.

Digital Serial

The Digital Serial I/O option adds a multichannel digital serial interface. This provides a direct connection to chip-level interfaces such as I2S and supports all popular serial interface formats including left justified, right justified, and DSP.


The B Series APx HDMI option (HDMI2+eARC) allows measurment of HDMI audio quality and audio format compatibility on devices such as surround sound receivers, set-top boxes, HDTVs, smartphones and tablets, and DVD or Blu-ray Disc™ players.


The B Series APx DIO option provides AES3, AES/EBU balanced digital I/O on XLR; unbalanced SPDIF digital I/O on BNC; and TOSLINK optical digital I/O.


Every new analyzer comes with a perpetual license for the current and next major software release, including a limited number of out-of-the-box measurements.

Measurements Included in APx516B Base Configuration: Level and Gain, THD+N, Stepped Frequency Sweep, Loudspeaker Production Test, Pass/Fail, Signal Acquisition

Subscribe to save and stay up to date: download any version of software and all software options, except PESQ and POLQA, with a software subscription.

Benefits of software subscriptions:

  • Access to latest software release
  • Includes all software measurement options (except PESQ and POLQA)
  • Available as 1-year, 3-year or 5-year subscription

Measurements Included in Subscription:

APX-FLEX-PACK-2 Crosstalk, Crosstalk Sweeps, DC Level, DC Level Sweep, DUT Delay, Frequency Response, Interchannel Phase, Level Ratio, Measurement Recorder, Noise, Noise Recorder, Q-Peak Noise, SNR, SINAD, Stepped Level Sweep.

APX-FLEX-PACK-3 Continuous Sweep, Digital Error Rate, Dynamic Range–AES17, IMD, IMD Frequency Sweep, IMD Level Sweep, Input Sample Rate, Maximum Output, Maximum Output (CEA–2006), Multitone Analyzer, Regulated Frequency Sweep, Signal Analyzer.

APX-FLEX-PACK-4 Acoustic Response, Bandpass Frequency Sweep, Bandpass Level, Bandpass Level Sweep, Cumulative Spectral Decay, Impedance/Thiele-Small, Modulated Noise, Polar Plots, Transfer Function.




  • Residual THD+N (20 kHz BW)
    -100 dB + 2.0 µV
    Typical <-109 dB (1 kHz, 2.5V)


  • Sine Frequency Range
    2.0 Hz to 80.1 kHz
  • Frequency Accuracy
    3 ppm
  • IMD Test Signals
  • Maximum Amplitude (balanced)
    14.40 Vrms
  • Amplitude Accuracy
    ±0.05 dB
  • Flatness (10 Hz – 20 kHz)
    ±0.008 dB
  • Analog Output Configurations
    Unbalanced, balanced, common mode
  • Dolby / DTS Generator
    Yes (encoded file)


  • Maximum Rated Input Voltage
    125 Vpk
  • Maximum Bandwidth
    >90 kHz
  • IMD Measurement Capability
  • Amplitude Accuracy (1 kHz)
    ±0.05 dB
  • Amplitude Flatness (10 Hz – 20 kHz)
    ±0.010 dB
  • Residual Input Noise (20 kHz BW)
    2.0 µVrms
  • DC Voltage Measurement