This document is a user manual for Sevana AQuA - Audio Quality Analyzer 8.x. It introduces AQuA as a tool for intrusive perceptual voice quality analysis that allows comparing two audio files and testing voice quality loss between a reference and degraded file. The manual describes AQuA's functionality, requirements, testing parameters, scientific background, perceptual modeling, command line usage, and provides examples of comparing audio files and analyzing reasons for voice quality loss.