Driver and install dependent. For example, one of the subs I'm running for MECA finals is more efficient than the other sub I have. It doesn't need nearly as much power to do the same score as my other sub. I can push both subs into compression, but the more efficient sub goes into compression more quickly. However, both subs do the exact same score when they're in compression. In my install, both subs can do the same score at full power. The sub that I compete with is the one that is louder with less power, it's more efficient.