Yeah quad 1.1 coils. I didn't know I could wire it to .5 either until Thilo told me. I don't remember how to do it though. If I decide to do it I'll have to call him and I'll post up on how it works.I JUST WANT IT TO BE LOUDER!!! without turning it off for a week lol. Although that does work cuz I didn't have my car for 2 days last week and when I drove it again it seemed noticably louder, but only for about 2 songs.