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APx1701 Transducer Test Interface
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APx1701 Transducer Test Interface
The Audio Precision APx1701 Transducer Test Interface is an APx accessory that integrates instrument-grade amplifiers and microphone power supplies for designers and production test engineers seeking clear insight into the behavior of loudspeakers, headphones and microphones.
It drives loudspeakers and headphones with dedicated power amplifiers, enables impedance measurements, and powers measurement microphones and microphones under test. Its functions are integrated with APx500 software and a connected B Series or legacy APx analyzer (APx500 v4.3 or later).
Key Features
- Signal-to-noise ratio ≈ 134 dB; 20 dB fixed gain from DC to 100 kHz
- Residual THD+N ≤ −100 dB (10 Hz–20 kHz, 80 kHz BW)
- Two independent amplifier channels, up to 100 W into 8 Ω (single channel)
- Current-sense resistors for easy impedance measurement
- 2 balanced mic inputs with +48 V phantom; 2 unbalanced BNC inputs with CCP, TEDS-capable
- Ships with ISO/IEC 17025 accredited calibration
Key Specifications
| Power ratings | 100 W (1 ch into 8 Ω); 60 W (1 ch into 4 Ω); 30 Vrms (2 ch into ≥ 15 Ω) |
| Frequency range | DC to 100 kHz |
| Frequency response | ±0.08 dB (10 Hz–20 kHz, DC-coupled); ±0.30 dB (20–50 kHz); ±0.80 dB (50–100 kHz) |
| Voltage gain | 20.0 dB (×10) |
| Residual noise | ≤ 7.5 µVrms (22 kHz BW); ≤ 13 µVrms (80 kHz BW) |
| Signal-to-noise ratio | ≈ 134 dB (ref 30 Vrms output) |
| Output impedance | ≈ 0.13 Ω |
| Residual THD+N | ≤ −100 dB, 10 Hz–20 kHz (80 kHz BW) |
| Microphone inputs | 2 balanced (XLR, switchable +48 V phantom); 2 unbalanced (BNC, switchable CCP 4 mA / +24 V, TEDS-capable) |
| Maximum mic input | 10 Vpk balanced; 5 Vpk unbalanced |
| Input crosstalk | ≤ −78 dB + 1 µV to 20 kHz |
Datasheet available on request.
