Often, users of Beyerdynamic headphones face the problem of rattling at low frequencies. The rattling increases with increasing volume. It mainly happens with the models DT 1990 Pro, DT 1770 Pro, DT 990 Pro, and DT 770 Pro. The reason is the hair that got under the foam disc on the speaker. The problem can be solved in a few minutes, special skills and tools are not required. Let's consider the cleaning process using the example of the Beyerdynamic DT 1990 Pro model.
1) Remove the ear pads. Insert fingers under the ear pad and gently pull away from the speaker.