The combination of seemingly opposite properties - a feature common to all products of AUDIUM. You can find this also at the Comp 8 Drive - our passive reference full-range speaker combined with an integrated active Subwoofer. This combination allows the use of amplifiers with very low output power like e.g. Triode-Tube amplifiers. The amplifier only has to drive the full-range speaker. The 9" woofer integrated in the speakers bottom plate is driven by the 180W digital amplifier. A DSP allows additional tuning of the speaker according to your room requirements and your personal listening preferences. AiM - the AUDIUM interactive Manual, software for your PC makes this task mere child's play! The Comp 8 Drive - more then just the sum of it's parts!