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Given the high pressures of life in modern society, promoting relaxation can improve the quality of daily life. This study proposes a relaxation system that uses monaural beats with ultralow-frequency inaudible sounds to promote relaxation. To effectively promote relaxation, monaural beats in the <inline-formula> <tex-math notation="LaTeX">$\delta $ </tex-math></inline-formula> band, <inline-formula> <tex-math notation="LaTeX">$\theta $ </tex-math></inline-formula> band, and <inline-formula> <tex-math notation="LaTeX">$\alpha $ </tex-math></inline-formula> band were used and evaluated. To avoid directly influencing people&#x2019;s activities, the frequencies of the stimulation sounds, which were used to generate the target beats, were out of the frequency range of people&#x2019;s hearing sense. To examine the performance of the proposed approaches, a subjective testing procedure was designed, and paired-sample <inline-formula> <tex-math notation="LaTeX">$t$ </tex-math></inline-formula> tests were performed. The <inline-formula> <tex-math notation="LaTeX">$p$ </tex-math></inline-formula> values for the experimental relaxation results with monaural beats in the <inline-formula> <tex-math notation="LaTeX">$\delta $ </tex-math></inline-formula> band, <inline-formula> <tex-math notation="LaTeX">$\theta $ </tex-math></inline-formula> band, and <inline-formula> <tex-math notation="LaTeX">$\alpha $ </tex-math></inline-formula> band were 0.0001, 0.1195, and 0.0065, respectively. Furthermore, the experimental results revealed specific effects of the proposed relaxation system; for example, the <inline-formula> <tex-math notation="LaTeX">$\delta $ </tex-math></inline-formula> band had the greatest effect regardless of whether the average, variance, or <inline-formula> <tex-math notation="LaTeX">$p$ </tex-math></inline-formula> value was assessed. On the basis of our experimental results, the proposed relaxation system model can help promote relaxation.