Car Stereos: 12 subs, channel amp, sentra

Question
i got a full system upgrade with a 4 channel amp & a 2 channel amp in my 97 sentra the problem is when the music plays it moves to the subs the question is is that normal or do i need to fix it?

Answer
Steven, the subs are supposed to appear to be vibrating uncontrollably, but that is it.  If the sub enclosure is moving around, it shouldn't bother anything, but it may wear against some parts and make the appearance that it has been rubbed around.  Just be sure the subwoofers themselves are not running into anything.  If they are, then you need to secure the enclosure down better to keep them from rubbing on anything.  Hope this helps, Scott