A subwoofer produces low frequencies that extends the
bass of a full-range speaker system. There are two kinds of
subwoofers, active and passive. Passive speakers use speaker cable.
Active Subwoofers are connected to the amp with a interconnect. Low
Frequencies travel differently from midrange and high frequencies so
just any interconnect won't necessarily give you the best bass
possible. Monster has a complete line of active subwoofer cables
engineered specifically to deliver those deep rumbling tones.