Jbl 4349 is for like 90+ dB listening levels.
For 50-55 db, get some hifiman headphones.. or get some niche in-ear earphones and stick it in your ear (small drivers/associated impulse response, clarity, detail, etc should work well for 50-55 dB sleeping levels). One thing to watch out for is that snoring levels may easily exceed the 50-55db and drown your music.
My question is do the JBL’s 4349 play full bodied and dynamic at around 50-55 dbs?