Hello All! I bought a used amp with a cab, which is a 4x10", 8 ohm, 450 W. And I want to add a 1x15" cab to this set. My questions are: 1. The cab have to be minimum 400 W, and 8 ohm inpedance, or enough less? 2. Which is the best for connect? Connect into the amp directly or continue from the existing cab? 3. It is possible, the additional cab overload the amp? Sorry for the st..id questions, but I don't know, and don't want kill my amp. Many thanks.