Qtc

what is the QTC of a subwoofer, and how do you find it out? Audiobahn does not have it on their specs sheets they offer. I want to find out what it is for my 2 aw150qs

QTC is dependent on the box itself (for sealed box..the bigger the box, the lower the qtc..the smaller the box..the bigger the qtc). but in reality, qtc is overrated because there are so many things that will affect the sub and the way it sounds that one parameter will not judge the whole system.