Rear Panel 1. Power Input: Connect the included power cable to this input and connect the other end of the cable to a power source. Make sure the Power Switch is set to off when plugging and unplugging the cable. 2. Fuse: If the unit’s fuse is broken, power off the subwoofer and disconnect it from the power outlet, and then lift this tab to replace the fuse. Replace it with a fuse that has the appropriate rating (printed under the unit’s power cable input). Using a fuse with an incorrect rating can damage the unit and/or fuse. 3. Power Switch: Turns the subwoofer on/off. Make sure the Volume knob is set to “-∞” before turning it on. 4. Thru Output: Use standard XLR cables to connect these outputs to a loudspeaker. Input 1’s signal is sent to the left Thru Out and Input 2’s signal is sent to the right Thru Out. 9 6 3 7 8 5 4 1 2 5. Inputs: Use a standard XLR, TS, or TRS cable (not included) to connect your sound source to these inputs. 1 is the left input, and 2 is the right input. 6. Volume: Turn this knob to adjust the subwoofer’s output volume. 7. Signal/Limit LED: This LED lights up green when an audio signal is sent to the subwoofer—it flashes at lower levels and lights solidly at higher levels. The LED lights up red when output limit/protection is active—if the LED is lit red continuously, reduce the volume of your audio source. 8. Speaker Use Button: Press this button to select the front-end EQ applied to the signal using these options: Live (slightly less extreme low-frequency with enhanced 60 Hz – 80 Hz for kick drum and bass guitar emphasis), DJ (enhanced low-frequency bump) or EQ Off (flat response). Note: If you are using TS4 mains, please match the Speaker Use settings between the TS4 top and TS4 Sub for optimal performance. If you are using TS4 mains with a custom EQ, please choose whichever TS Subs Speaker Use setting sounds best with the custom EQ that you are using. 9. Phase Alignment Button: Press this button to adjust the phase of the output by 90, 180, or 270 degrees to compensate for low-frequency cancellation.