DESC: Using the technology it previously supplied for large stadium rock concert sound systems, the world's leading loudspeaker innovator, Wharfedale, has created the new Topaz range of high-power subwoofers for home theater applications. These subwoofers are designed around a new generation of exclusive high-performance drive units offering long-throw excursions, low distortion, and high power handling. Topaz low-frequency loudspeakers have sealed box acoustic systems for linear phase operation, ensuring a tight, controlled bass sound entirely free of "woolly bass" problems associated with ported systems. Inputs are provided for both line-level and speaker-level signals and have controls for volume, bandwidth, power, and phase. Hardened steel floor spikes are also provided.