Rockford Fosgate M1 6B 6" Color Optix Marine 2 Way Speakers Black (M16B) (OPEN BOX LIKE NEW) sxs which channels cool air directly Color:Black Gray which channels cool air directly to the voice coil Here’s an in depth look at why the Focal ISUB ACTIVE might be the perfect addition to your vehicle's sound setup Built in illumination brings these speakers to life and can be coordinated with other Color Optix speakers and subs using Rockford Fosgate's Color Optix Controller (not included) and RF Connect App Rockford Fosgate uses a UV treated polypropylene cone and durable Santoprene rubber surround for the low frequency impact that never quits