This L'Acoustics SB118 18-inch passive subwoofer offers powerful audio but has a known issue: the grille is missing.

To use this subwoofer, first connect it to your audio system following the standard audio connection methods. Place it in a proper position in your room for the best sound effect. Remember, since the grille is missing, be careful not to let any foreign objects get inside the subwoofer. When it comes to maintenance, keep it in a dry and clean place. Wipe it gently with a soft cloth regularly to keep it clean. If you notice any abnormal sounds or performance issues, it's advisable to seek professional help.