AP - The Recognized Standard In Audio Test


Fully Integrated Bluetooth Audio Test Solution

Enables direct measurement of Bluetooth devices and eliminates need for external components.

APx525 showing Bluetooth module

The APx Bluetooth® option is the best solution in the world for testing Bluetooth audio. No other analyzer combines integrated Bluetooth controls with APx’s best in class speed, ease-of-use and performance.

Today, engineers are limited to subjective listening tests, or to connection through components or systems that may subject the signal to unspecified and uncontrollable gain, distortion or sample rate conversion. APx’s built-in Bluetooth radio and Bluetooth stack allow engineers to measure their Bluetooth devices directly, eliminating the uncertainty and inconvenience of adapters and making Bluetooth audio test faster, easier and more reliable.

Integrated Bluetooth control for reliable wireless connectivity

With APx, all Bluetooth controls are integrated into the analyzer software. In addition to standard commands like pairing or opening a connection, it’s easy to switch between profiles and roles on the fly, specify a custom device class, connect with a preferred sample rate or codec, or force open a SCO without ringing. For deeper protocol analysis, a link key is available to cut and paste into a Bluetooth packet sniffer.

Wide Band Speech Support

Bluetooth Wide Band Speech (HPF 1.6 profile, mSBC codec) provides increased bandwidth for speech signals, allowing manufacturers to significantly improve the audio quality of headsets and other audio accessories used for communications.

Comprehensive audio test from the recognized standard

Once connected, every audio characteristic can be measured. Key features include 30+ one-click audio measurements (including all standard weighting filters), 1.2M point FFTs, real-time oscilloscope monitoring, custom reports, statistical calculations, and quasi-anechoic acoustic measurements. With 21 measurements in one second, the APx multitone analyzer is ideal for Bluetooth production test.

Isolation of audio stages

With APx, nearly any combination of input and output can be measured directly: Bluetooth, analog (2, 4, or 8 channels), AES3 or S/PDIF digital, I2S digital serial, PDM and HDMI are all available.

Quasi-anechoic acoustic test

HATS manekin

Most Bluetooth devices have Bluetooth at one end of the audio chain and a transducer at the other. APx’s Acoustic Response measurement makes 14 key acoustic measurements in 3 seconds and uses an energy time curve to find the ideal time gate quickly and easily.

Perceptual audio tests

Obtain MOS values with the Perceptual Audio (PESQ) Option for APx500. The APx Bluetooth options acts as an ideal transmitter or receiver, allowing the device under test to be accurately assessed.


Handsfree & headsets

APx’s quasi-anechoic acoustic measurements and built-in SCO and AVRCP commands are ideal for testing handsfree devices and wireless speakers, including those using mSBC Wide Band Speech. Obtain MOS values from PESQ for complete testing of communications products.


APx switches between A2DP and HFP seamlessly, and supports streaming over a SCO or .wav file playback for testing smartphones. As an example, APx525-DSIO-HDMI-BT features two channels of analog and digital, digital serial, HDMI, and Bluetooth I/O.

Automotive audio

4 channels of high performance analog with a 300 Vrms max input (bal), plus Bluetooth, makes the APx526-BT ideal for automotive head units.

A/V Receivers & Bluetooth chips

Ultimate connectivity. Test Bluetooth-to-HDMI, Bluetooth-to-surround speaker outputs, Bluetooth-to-S/PDIF, Bluetooth-to-I2S. Ideal for multichannel receivers or Bluetooth chips.


Key features

  • Comprehensive audio test over Bluetooth® wireless technology.
  • Built-in Bluetooth radio and Bluetooth stack supports A2DP, HFP, HSP, and AVRCP profiles, and SBC, aptX, CVSD and mSBC codecs.
  • Built-in Bluetooth controls: Open a connection, ring a device, send AVRCP commands.
  • Check every part of the audio chain with one analyzer: Bluetooth to analog, AES3 digital, S/PDIF, HDMI, PDM and I2S.

Ideal for testing

  • Smartphones
  • Headsets
  • Automative head units
  • AV Receivers
  • Computers
  • Bluetooth Dongles
  • Bluetooth Adapters
CSR aptX logo


  • Bluetooth Core Version
  • Profiles / Roles Supported
    A2DP Source; A2DP Sink; HFP Audio Gateway; HFP Hands-Free; HSP Audio Gateway; HSP Headset; AVRCP Controller
  • Codecs supported
    SBC; mSBC; aptX; CVSD
  • RF Connection
    Type N female jack. Antenna with
    N to SMA adapter included.


  • RF Input Impedance
    50 Ω typical
  • RF Output Impedance
    50 Ω typical
  • RF Power
    0 dBm typical, 4 dBm maximum
  • RF Sensitivity (0.1% BER)
    –81 dBm Typical

  • PC with 2 GHz or faster processor, 2 GB or more RAM
  • 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).
  • 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.

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