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Electro-Acoustic Test

Whether evaluating the performance of loudspeakers, headphones, or microphones, electro-acoustic test can be challenging. In the case of loudspeakers and microphones, extraneous noises and reflections from surrounding walls and floors interfere with the measurements. Headphones present their own challenges, owing to the close coupling of earphones to the ears and the associated acoustic transmission paths.

In addition to industry-leading analog performance and the widest array of digital options, APx500 Series analyzers offer fast, cost-effective electro-acoustic test of raw drivers and integrated audio products from the R&D lab to the factory floor.

With APx, engineers can use a single analyzer with a single automated project to test analog circuitry, Bluetooth connectivity and driver electro-mechanical characteristics like impedance, Thiele-Small, and rub & buzz. The result will be a single, consistent data set ready to share between collaborators, or an integrated report from the most reliable and trusted name in audio test.

APx1701 Transducer Test Interface

Low Noise, Low Distortion and Flat Response for Loudspeaker, Headphone and Microphone Measurement

Audio Precision APx1701

Data sheet



Developed for designers and production test engineers seeking clear insight into the behavior of their electro-acoustic devices, the APx1701 Transducer Test Interface is an APx500 software-controlled test accessory that combines instrument-grade amplification with signal conditioning for pre-polarized measurement microphones, and phantom power for professional microphones.

  • Designed for headphone, speaker & microphone test
  • Fully integrated with APx500 audio measurement software
  • Two-channel power amplifier with 20 dB of fixed gain from DC to 100 kHz
  • Integrated current-sense resistors for impedance measurements
  • ±0.08 dB frequency response (10 Hz to 20 kHz; DC-coupled)
  • 134 dB signal-to-noise ratio
  • Integrated microphone power supplies support phantom power and CCP
  • TEDS-capable microphone inputs