Audio Precision APx1701 Transducer Test Interface – A new level of performance in electro-acoustic test



A new level of performance in electro-acoustic test

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.

Market-leading performance

The APx1701 is a PC-controlled test accessory providing 20 dB of fixed-gain amplification from DC to 100 kHz. Voltage taps across integrated current-sense resistors in the amplifier outputs enable easy impedance curve measurements. The amplifier channels are configured independently, with power ratings up to 100 W for a single channel into 8 . In the frequency range of 10 Hz to 20 kHz, the system’s residual THD N is  –106 dB (80 kHz BW) and frequency response is ±0.08 dB (DC-coupled). Signal-to-noise ratio is an industry-leading 134 dB.

For microphones, either as measurement mics or as the device under test (DUT), the APx1701 is equipped with pairs of balanced and unbalanced microphone inputs. The balanced inputs include switchable 48 V phantom power, while the unbalanced inputs support switchable CCP (Constant Current Power) and are TEDS-capable (Transducer Electronic Data Sheet).