well this is kinda hard to explain, but shocker audio used to be called atomic thunder, but something happen and mike had to change the name to shocker audio, so any atomic thunder sub you find is the same thing as a shocker sub.
There's a guy selling 2 - 15" Atomic Extreme Thunder subs in a custom box for $1500.00 here.. seemed a bit high for a brand I've never heard of. Am I wrong?