well in theory the 12's would possibly be louder if the factors are rightMaybe the wording is wrong how about 2 good 12's versus 1 good 15
word... I had 2 12"L7's get louder than 4 12" Type R's because of sheiiiiiityy asz box... absolutely dispicable designbut i have out metered an suv with four 12's because of sucky as box and install. it is all about the factors in the situation