my l7 makes a odd noise as well with only certain songs but i think its just the subs mechanical bc you cant hear it when you are more than 3 or 4 feet away only when u r withing 2-3 feet of the sub is it just bc its new and breaking in or what
i think it will be ok, if it blows then ill get it fixed and start over, but so far its not getting hot, or even warm at all. its definitely alot louder now.