"all-in-one" Compact Passive Cardiod Subwoofer
S18C is a combination of horn-loaded S18F subwoofer and reflex-loaded 12" driver working together as a passive cardioid subwoofer featuring Passive End Fire Technology.
Low frequency directivity control with ONLY ONE amplifier channel required
Patented Passive End Fire Technology hybrid enclosure design
Extremely accurate and dynamic low frequency reproduction