A unique subwoofer with a very po-werful 18” LF driver for an extended bass at almost unbelievable levels. Very likely the best of its gender, the NAC-118 maintains high sensitivity and efficiency while pouring out deep, accurate bass with precise definition and transient characteris-tics. This model is to be used when more level and more extended bass are desired and available space won’t allow a double 15” or double 18” subwoofer.