[. . . ] The terms of this warranty apply only to PC audio, TV or gaming speaker systems when such speakers are returned to the respective authorized Altec Lansing Technologies, Inc. Under the terms of this warranty, the original consumer purchaser has certain legal rights and may have other rights, which vary worldwide. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that product heat. [. . . ] WARNING: The subwoofer is NOT magnetically shielded, so it must be kept at least 2 feet (0. 6m) from PC monitors, TV sets, computer hard drives, or any other magnetic media (floppy discs, computer or audio tapes, etc. ) The subwoofer is non-directional, so it doesn't need to be placed in any particular location. Putting it on the floor close to a wall or in a corner will maximize bass efficiency and be sure to provide it with proper ventilation. The speakers are magnetically shielded, and can be placed close to a PC monitor or TV set without distorting the image. Master Volume The knob labeled VOL on the front of the right satellite is the master volume control for the speaker system. turn the knob clockwise to increase the volume and counter-clockwise to decrease the volume. Treble The treble level for the system is located on the front of the right satellite. Rotating this control knob clockwise increases the treble, while rotating the control knob counter-clockwise decreases the treble. Bass The bass level for the subwoofer is located on the front of the right satellite. Rotating this control knob clockwise increases the bass, while rotating the control knob counter-clockwise decreases the bass. WARNING: Do not insert the system's power plug into an AC outlet until all other connections are made. And turn off audio sources before connecting them to the VS4121's inputs. To ensure first-time operation as expected, please carefully follow the connection sequence described below. [. . . ] If not, you may be able to purchase a shielded stereo cable from your local electronics store. Some low hum may be detected when your speaker system is powered on without an audio source playing, or when the volume is set at an extremely low level. Unplug the power cord from the surge protector (if used), and plug directly into an AC wall outlet. [. . . ]