Built on 30 years of experience manufacturing test equipment recognized as the industry benchmark for audio testing, the APx555B is a fully uncompromised 2-channel audio analyzer. Developed for R&D engineers and production technicians who demand top-tier performance, comprehensive digital I/O options, and fast, intuitive measurement software, the APx555B sets the new global standard for audio analyzers.

With typical residual THD+N reaching -120 dB and a measurement bandwidth exceeding 1 MHz, the APx555B outperforms all competing audio analyzers in analog performance, delivering a 5 dB improvement over the legacy 2700 Series analyzers. Paired with 1.2 million-point FFT analysis and full 24-bit resolution, it delivers unrivaled measurement performance unavailable from any other instrument.

The APx555B is equipped with two balanced and two unbalanced analog input/output channels, plus 216 kHz-capable digital input/output ports via AES/EBU, TOSLINK and SPDIF. Its I/O capacity can be further expanded with optional modules including Digital Serial, HDMI with ARC, PDM and Bluetooth. The integrated Advanced Master Clock (AMC) module manages all input and output clock signals to synchronize the APx555B with external devices (or synchronize external equipment to the analyzer). The AMC also supports jitter generation and jitter analysis as native functionality. The AMC module comes as standard on the APx555B and is available as an optional upgrade for the APx52x and APx58x Series audio analyzers.