For the serious audiophile or Karaoke DJ. This system will rattle your neighbour's dishes :). The subwoofer is an RCF MSW8 300 watt professional unit. The special "Dual Load Reflex" configuration makes it possible to get a high level of efficiency, as well as a considerably extended low range frequency response and extremely reduced distortion, features that are not easily found in traditional "direct radiation" speakers. As the subwoofer range is non-directional, the unit can be installed in the most convenient place, even in a semi-hidden position, as it is very difficult to locate the origin of the sound at this frequency. The built-in crossover filter can be excluded by means of a two-position switch accessible on the subwoofer rear connector panel. This passive high-end subwoofer requires a separate amplifier which is included in this package deal. The Bogen HTA250A Power Amplifier is a high-performance unit employing Power MOSFET technology. The unique characteristics of Power MOSFET circuitry make it ideally suited to power amplifier design, providing far superior performance and reliability compared to other types of transistors. The HTA250A offers higher efficiency, reduced heat, simpler overall design, reduced size and weight. The HTA250A Model supplies 250 watts (rms continuous output) at less than 0.5% total harmonic distortion from 20 to 20,000 Hz. This amplifier and subwoofer combination would easily cost over $1500.00 new. This is an exceptional deal.