FAQ What are the ventilation requirements for the QW 118P speaker? The speaker must have at least 6" of clearance on all sides for proper ventilation.Can I connect the inputs of the QW 118P to the output of a power amplifier? No, the inputs are meant to be driven from a line-level strength signal and should not be connected to the output of a power amplifier.Can I use the left or right input jack group as mixers? No, running more than one signal source at a time into either channel group could damage the outputs of the source units.