i've never used them or ever plan to.for $249 each,they are a bit steep(aura makes cheaper),but it looks like you would have to run a line from your sub out to an amp to power them,soooo,it could involve hidden cost.(plus one for each seat) i just rearranged the basement(with carpet and padding and found out just how hard my sub is hitting in the hot seat!
my opinion is that they are a waste!