It is a DVC sub. When I first installed the new amp it played for about 40 mins then went into protection mode. Now anytime I put the fuse in it goes straight into protection. I have no idea what size inline fuse is in there. It came with the amp kit. The fuse hold is only a black casing so I wanted to upgrade it anyway. When I tried the second amp the sub still worked fine. The green light would blink and I would hear the sub catch a single but that is it.