For a closed box, you use Qts, Fs and Vas. Vb will then give you the Qtc you are after, for example, the flattest response=Qtc 0.707. I've been told that for a sealed, a Qtc of 0.8 will sound even better, I don't know. 0.8 will however give you a smaller box than 0.707. For a sealed box, you...