Dayton Audio VIT-1 Isolation Transformer
The Dayton VIT-1 virtually eliminates the 60 Hz hum introduced into your home entertainment system through your analog cable or antenna connection, and is usually noticed when connecting a powered subwoofer to your home theater system. A passive design does not affect your analog cable tv signal strength (not recommended for use ondigital cable or cable modem installations). In extreme cases the use of a grounding block may also be necessary.
Connect the transformer in-line between your cable line and TV using the female F-connector on the cable side, and the male F-connector on the TV. Operating frequency: 54 MHz to 1 GHz.
Note: Interferes with digital cable, cable modem, and satellite TV operation.