One known issue is that the grille cloth is falling apart.

To use this D&B Audiotechnik E12 - SUB subwoofer, first, place it in a suitable location in your audio setup. Make sure it's on a stable surface. Connect it to your main audio system following the instructions on the back of the unit. When using, adjust the volume and other settings according to your preference. Regarding the issue of the grille cloth disintegrating, try to avoid touching it too roughly. For maintenance, keep the subwoofer in a dry and clean environment. Regularly check the connections to ensure they are secure. If the grille cloth issue gets worse, you may need to contact a professional for replacement.