The phrase "more ear-popping" generally implies a sense of discomfort or pressure in the ears, often caused by changes in altitude or air pressure. Antonyms for this phrase might therefore include "less intense," "gentler," "milder," "calmer," or "easygoing." Alternatively, antonyms could focus on the sensation of "popping," and might include terms like "unobtrusive," "unnoticeable," "subtle," "quiet," or "barely perceptible." Ultimately, the most appropriate antonyms will depend on the context and intended meaning of the phrase, and may vary significantly depending on the individual speaker or writer.