Looking directly below the power switch, in the bottom left corner is the power cable that connects the Sub10 to a standard three prong electrical outlet.
Moving along the bottom of the rear panel, towards the center point, you will notice a series of connections. These connections are used when a normal line-level subwoofer connection is not available. These connections enable the user to connect the standard speaker outputs from a receiver or amplifier to the subwoofer. Then using the high level output conections on the Sub10, the user can connect the subwoofer to a set of main speakers. Using the lowpass adjustment on the Sub10, the user can determine what frequencies the Sub10 will use and what frequencies the Sub10 will pass onto the main speakers.
Just to right of the high level outputs on the Sub10, towards the bottom right of the rear panel, is where the standard RCA line level inputs are. These inputs is where you connect the subwoofer output on your home theater receiver to. You can either connect from single LFE (Low Frequency Effects) output (usually just labeled Subwoofer Out or Subwoofer Pre-out on a Receiver) or a stereo preamp output.
Moving up the right side of the rear panel of the Sub10, you encounter two switches. The Auto/On switch sets the Sub10 up to automatically activate when it senses an low frequency signal. If you can also opt for turning the sub on manually.
Above the auto-on switch is a the phase switch. This enables the user to match the in/out motion of the subwoofer speaker to the in/out motion of the rest of the speakers. This will result in bettter bass performance.
Moving up again, you will notice two dials. The bottom dial is the Lowpass adjustment. This allows the user to set which frequencies will be passed to the subwoofer and what point frequencies will be set to move on the main or satellite speakers.
Lastly, on the top right of the rear panel is the Gain control. This sets the volume of the subwoofer in relation to the other speakers. However, if your receiver also has a subwoofer level adjustment, it is best to set the gain control on the subwoofer itself to maximum or almost to maximum and then control the actual volume balance between the subwoofer and the rest of the speakers using the subwoofer level control in your receiver.