I have two A/D/S 312rs/4. They have been installed in my uncle's minivan for a week while he waited for his new subs. They were powered by a Sundown 1000D at one ohm with the gain set at 1/4. They have just broken in. I hooked them up myself and as well as setting up the head unit so they have not been abused by any means. However, one of the subs had a section of surround come off of the cone. I have no idea why this happened but I repaired it with goop and it works great. I will have pics tomorrow. These are in great shape, no dings or dents in the cone and they sound amazing.