An audio review & news blog. The volume should not exceed 80 dB is recommended. I usually adhere to the safe-listening style by WHO. Please note that my aural impressions and interpretations of measurements are also made from a safe-listening style.
The QCY T20, as the brand describes it, is a typical "low frequency idiot" with powerful heavy bass, a sound that I don't think is suitable for everyone. Personally, though, I like it a lot.