FAQ How should I connect the QW 118P speaker to an amplifier? The inputs of the QW 118P should never be connected to the outputs of an amplifier. The outputs should be used with line-level signal.Can I remove the metal protective grill from the QW 118P speaker? The metal protective grill should never be removed for safety and functionality purposes.What type of cables should I use to connect to the QW 118P speaker? You can use standard 1/4" cables, but balanced cables will provide better rejection of interference and performance.