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The main benefit of using digital signal processing (DSP) in audio systems is that it enhances audio quality and control. DSP allows for precise manipulation of audio signals through algorithms and digital filters, which can significantly improve clarity, reduce noise, and enhance overall sound quality. By employing techniques such as equalization, compression, and reverb, DSP provides audio engineers and sound technicians with the tools to tailor sound to meet specific needs and environments.

Furthermore, DSP enables advanced features like surround sound processing, dynamic range control, and feedback suppression, all of which contribute to a more immersive and enjoyable listening experience. In addition, the control offered by DSP allows for adjustments in real-time, accommodating changes in acoustics or audience preferences without the need for complex hardware changes.

While other options like cost reduction, minimizing space requirements, and simplifying installation might have some relevance in certain contexts, they do not encapsulate the primary transformative impact that DSP has on audio quality and the level of control it provides over the sound.