Behringer eurolive vq1800d pa subwoofer behringer vq1800d professional active 500 watt 18 pa subwoofer with built in stereo crossover br eurolive vq1800d and vq1500d active subwoofers are ideal for adding serious bottom end to dj and club rigs packed with an incredible array of professional features these little powerhouses provide lots of low end punch with the kind of definition and clarity typically reserved for much larger systems br instead of operating relatively continuously