Perhaps if this question could be answered: The 3db down point for the sub is where it is 3 db down from the reference level. Now if the second sub is added under ideal conditions then there should be a +3 db increase across the frequency range. This raises the reference level by 3 db. Now, why would the F3 point be different than before? Everything should be the same, just 3 db louder.

This is in an ideal model with perfect interaction. Real world setups will get much too complex for us right now.

[This message has been edited by JT Clark (edited August 24, 2004).]