6 Simple Ways To Check If Your Headphones Are Too Loud - Headphonesty
How to measure the decibel level of music coming from my headphones - Quora
PSA: If you've been wondering how loud your headphones are, and you happen to have an Apple Watch with the DB meter, you can just set it in the cup with the
How to check decibel levels on iPhone and Apple Watch - 9to5Mac