The RCA1000 single channel Hum Eliminator can be used to remove Ground current induced video interference such as “hum bars” and eliminate any visible distortion and improve picture quality. 75 Ohms impedance. Almost all cases of video noise and audio buzz can be traced directly to ground loops or poor grounding. Each component of a video or sound system produces its own ground internally. This ground is usually called the signal ground. Connecting devices together with the interconnecting cables can tie the signal grounds of many components together through the conductors in the cable. Ground loops occur when the grounds of the two units are also tied together in another place: via the electrical ground in the line cord or power strips. etc. These situations create a circuit through which current may flow in a closed "loop" from one unit's ground to another units ground. Many times it is impossible to eliminate these currents entirely. When that happens Allen Avionics has the Video Hum Eliminators with RCA connectors to make your home theater experience better.