The SR-4.2 is a 2-way 4" component system.  It uses the WR-4 (triple neodymium magnet midbass) and CR-104 (neodymium double magnet tweeter).  It has great clarity and detail with precise imaging.  The system comes complete with the XR-2.2 2-way crossovers.  More information on the individual components can be found by clicking on the links.