Complex sentence: The first generation CDWG was incorporated into the grill of the RM30 and RM40 speakers as an aperture (slit) with sound absorbing foam between the front baffle.
Split into simpler sentences: The first generation CDWG was attached like speaker grill to the RM30 and RM40 speakers. The CDWG consisted of an aperture (slit) with sound absorbing foam between the CDWG grill and front baffle.