Ok, So I have a kicker comp sub that's a ten inch I think 4 ohms and 500 watts and I'm using to a home receiver running 100 watts per amp and the receiver is a kenwood from I think 2007, And I have been running it clean so far, But I have to turn the bass down by alot or the receiver will just go right into protection mode. I tested it on my speakers and they get pretty loud about 84 db on my phone, But I know they can get way louder even though i'm using a usb driver that doesn't put enough sound anyways i'm thinking of getting an amp since my receiver gets so hot that I can't even touch it.. I haven't had any problems so far using it though so I don't know if I need an amp or not. One more thing is my motherboard doesn't work for sound so I have to use that usb driver thing I talked about and that lowers the sound but I went to my friends house and I hooked it up there and daym that shit was banging our neighbors house but what sucked was I had to bring the bass even more down because the receiver was running more power to the speakers. So do you think I should get an amp or just run it where it's at about 84 db is max, And about 65 to 70db average and it will still knock the breath out of me.