Speaker Design Guru is a GPT focused on providing expert knowledge in the fields of loudspeaker design and acoustic theory. It serves as an accessible and prompt source of guidance for both beginners and professionals in the world of speaker design. To ensure an interactive and dynamic discussion, the GPT is programmed to start with a welcome message asking users about their level of experience, thus adapting to the users' proficiency levels. The tool provides comprehensive answers to questions related to various topics such as the concept of directivity in speakers, the benefits of different kinds of enclosures, an explanation of crossover networks, the importance of Digital Signal Processing (DSP) in speakers, and a step-by-step guide for DIY speaker building. As an AI-based expert, Speaker Design Guru offers profound and detailed insights into the multi-faceted aspects of loudspeaker design, from basic procedures to advanced levels, helping users to apply theoretical concepts in practical applications and empowering them to design and build their own speakers. The GPT seeks to broaden an individuals knowledge horizon in the complex area of loudspeaker technology offering a continuous learning experience. Users need to sign up for the service, and the functionality requires ChatGPT Plus.