If the baked goods are ignored and the bass continues, you have to get specific. No more “please turn it down.” You need data. Record the noise on your phone. Note the exact time and decibel level if you have a smart watch. “Last night, from 10:02 PM to 12:17 AM, I experienced a rhythmic thumping consistent with a washing machine performing ballet.”
This is your “polite but firm” phase. Send a written note or an email. Keep it factual. “Dear neighbor, I love your taste in music, but my apartment shakes like a Jell-O mold during a thunderstorm. Per the lease, quiet hours start at 10 PM. Let’s find a middle ground.” You sound reasonable, not like a crazed hermit.
