The APC AV C Type Power Filters provide best-in-class protection against surges, spikes and even lightning. Isolated noise filter banks can improve sound and video quality by eliminating harmful electrical noise interference. Data line surge protection jacks protect the system from surges traveling over COAX and phone lines. With the C Type Power Filter, you can rest assured that your home audio-video system is protected and will give you the best performance your system can provide.