I see the term "long throw" mentioned quite a bit when referring to midwoofers but never see any definition of what it means. So I ask: what exactly makes a woofer a "long throw" one? What do I look for when shopping for raw drivers? I'm assuming it's a certain amount of xmax... But how much for it to be considered "long throw"? Let's assume for the sake of this discussion that we're talking about an 8" midbass driver.