The SR-6.3 is a 3-way component system.  It uses the WR-6 double magnet woofer (3" aluminum voice coil), MR-56 soft dome midrange (option: WR-4 midrange instead of MR-56) and CR-104 soft dome tweeter (neodymium double magnet system).  The system comes complete with the XR-3.3 3-way crossovers.  The performance of this system is outstanding:  dynamic, smooth and clear with very low distortion.  More information on the individual components can be found by clicking on the links.