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APx52xB Series Audio Analyzer
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APx52xB Series Audio Analyzer
The Audio Precision APx52xB Series offers the ideal balance of analog performance and breadth of digital I/O, designed for R&D engineers and production technicians who want fast and easy audio testing.
APx525B has two balanced and two unbalanced analog inputs and outputs plus digital inputs and outputs via AES/EBU, TOSLINK and S/PDIF. APx526B is the four-channel version of the APx525B, developed for the four-channel head units typical of the automotive audio industry. I/O may be expanded with optional Digital Serial (APx525B and APx526B), HDMI + ARC (APx525B), PDM (APx525B and APx526B) and Bluetooth (APx525B and APx526B) modules. The optional Advanced Master Clock (AMC) module synchronizes the analyzer with external equipment and enables jitter generation and analysis.
Key Features
- APx525B: 2-channel; APx526B: 4-channel analog I/O
- Residual THD+N typically < −108 dB (1 kHz, 2.5 V); < −110 dB with AG52 option
- Bandwidth > 90 kHz; > 1 MHz with BW52 option
- FFTs up to 1248K points
- AES/EBU, TOSLINK and S/PDIF digital I/O
- Optional modules: Bluetooth, PDM, Digital Serial, HDMI + ARC (APx525B), Advanced Master Clock
Key Specifications
| Sine frequency range | 0.1 Hz to 80.1 kHz |
| Frequency accuracy | 3 ppm |
| IMD test signals | SMPTE, MOD, DFD |
| Maximum amplitude (balanced) | 21.21 Vrms |
| Amplitude accuracy | ±0.03 dB |
| Flatness (20 Hz–20 kHz) | ±0.008 dB |
| Residual THD+N (20 kHz BW) | −105 dB + 1.4 µV; typically < −108 dB (1 kHz, 2.5 V); typically < −110 dB with AG52 |
| Digital output sampling rate | 27 kS/s to 200 kS/s (27 kS/s to 108 kS/s optical) |
| Dolby / DTS generator | Yes (encoded file) |
| Maximum rated input voltage | 230 Vpk |
| Maximum bandwidth | > 90 kHz; > 1 MHz with BW52 |
| Residual input noise (20 kHz BW) | 1.3 µV |
| Individual harmonic analyzer | d2–d10 |
| Max FFT length | 1248K points |
| DC voltage measurement | Yes |
Datasheet available on request.
