55 is really low...
Not at all. The outdoor AC unit typically have a SPL bet. 50 and 60 dBA. It really depends on the background noise level. At my house, the ambient SPL is around 30 dBA during the day and drops to 25 dBA at night. My nominal listening level is approximately 55–60 dBA, with high and low notes slightly boosted following the equal‑loudness contour EQ curve. Just be mindful—protecting your hearing is essential.