The number of subwoofer speaker cabinets and power amplifiers dedicated to low-frequency sounds used in a club depends on the type of club, the genres of music played there (live or via a DJ), and the size of the venue. A small coffeehouse where traditional folk, bluegrass or jazz groups are the main performers may have no subwoofers, and instead rely on the full-range main PA speakers to reproduce bass sounds. On the other hand, a club where hard rock or heavy metal music bands play or a nightclub where house music DJs play dance music may have multiple large 18" subwoofers in big cabinets and powerful amplifiers dedicated for subwoofers, as these genres and music styles typically use powerful, deep bass sound.