This paper analyzes three distinct topologies of audio equalizers. The focus is on understanding the fundamental principles behind each topology the Three-band equalizer, the five-band equalizer, and the single input multi-band split topology by examining their block diagrams, schematics, and working principles. Furthermore, the paper explores the potential applications of audio equalizer circuits in various domains, ranging from consumer electronics to professional audio processing and assistive devices. This analysis aims to provide a comparative overview of these equalizer designs and their significance in shaping audio tonal characteristics.