This d&b audiotechnik E12 - SUB Compact Bass - Reflex Subwoofer is a great choice for audio enthusiasts. However, it has a couple of minor issues. The NL4 connectors show a bit of rust, and there's a tear in the grille cloth. Despite these, it still offers good performance and is a worthy option.

Using this subwoofer is easy. First, connect it to your audio system using the connectors. Make sure to check the connections are secure. When it comes to volume, start at a low level and gradually increase it to your desired sound. As for the minor issues, keep an eye on the rusty NL4 connectors. You can use a gentle rust remover to slow down the rusting process. For the torn grille cloth, if it gets worse, you might need to replace it. Always store the subwoofer in a dry and clean place to maintain its performance.