If your input signal is connected to the Input A of your KC12, you can simply connect your external subwoofer to the Output A which is a passive pass-through (no DSP applied). If using a QSC KS or LS Series active subwoofer as the external unit, there is the added benefit that everything will be automatically phase-aligned.

You can also use the (post-DSP) Mix Output of the KC12 to feed an external subwoofer. This connection allows you to feed a selection of any Input (including Bluetooth) to the external subwoofer. Selectingwhich combination of A, B or C inputs you want to send to the Mix Output is made via the rear panel screen interface. If using a QSC KS or LS Series active subwoofer as the external unit, the KC12 system also includes a unique function called “External Sub Delay” which compensates for the added DSP throughput latency to ensure the KC12 system remains phase-aligned with any KS or LS Series external subwoofer. Enabling the function “External Sub Delay” is also made via the rear panel screen interface.