Yeah man, The SA's need a pretty fucking big box, especially for a tier 2 sub. The SA's also get a lot louder once they get broken in vs. out of the box but that's pretty much every sub. Mine shake the shit outta my car hitting like 33hz bro so they have no problem hitting lows. If you still think they're garbage then go up to the X series or the Zv3's or Zv4's. They're all great but you're gonna have to get a new box for sure because they're big as hell. like the reply said, you should get a bigger box for sure, I know I had to when I was upgrading from my Memphis PR-12's. I literally broke the box they were in before because the Sundown's didn't have enough room.