APx52x Series Modular, Two- and Four-Channel Performance Audio Analyzers
The ideal balance of analog performance and breadth of digital I/O.


Product Description

APx52x Series Modular, Two- and Four-Channel Performance Audio Analyzers

The APx525 is a two channel audio analyzer for R&D engineers and production technicians who want fast and easy audio test, but who may not need the ultra-high performance of AP’s APx555 nor require the multichannel capability of the APx585.

  • Versatility in I/O
    APx525 has two balanced and two unbalanced analog inputs and outputs plus 216k digital inputs and outputs via AES/EBU, TOSLINK and SPDIF. APx526 is the four channel version of the APx525, developed for the 4 channel head units typical of the automotive audio industry.

Additionally, I/O may be expanded with optional Digital Serial (APx525 and APx526), HDMI + ARC (APx525), PDM (APx525 and APx526) and Bluetooth (APx525 and APx526) modules. Additionally, the optional Advanced Master Clock (AMC) module handles input and output clock signals to synchronize the APx52x Series with external equipment (or vice versa), and the AMC also enables jitter generation and analysis (in conjunction with Advanced Digital, Digital Serial or PDM modules).



Sine Frequency Range
0.1 Hz to 80.1 kHz
Frequency Accuracy
2 ppm
IMD Test Signals
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 (1 kHz, 2.5 V – option AG52 installed)
Analog Output Configurations
Unbalanced & balanced



User Guide