What sub under a grand?

Did you tighten the bolts for the driver and all the other stuff? They can get loose after a while.

I have a REL and I like it a lot. Hsu subs would probably be my second choice. Yea, they're made in Red China and that sucks, that's the reason I went with the REL. The Hsu VTF series has a lot of control built into them. Bass ports, you can plug one or both with the supplied plugs. They also, have a Q control which can help get the tight sound you may want. Just a thought.

Jughead-

go w/ another REL- these subwoofer(s) are the best in the business! A sonic match for your current speakers. Keep me posted & happy listening!

I have tightened all 5000 bolts on driver and amp, still the same result. like i said with music its fine, with movies and games that's when the rattle starts.why would this be? and yes i agree with music the rel blends well with my mozarts but why can't it handle the low frequencies from movies or the ps4? could the bottom driver be bad? rel tech support can't seem to help with this question nor do they seem to care.

I just lost a detailed post for the OP to use as he see's fit, but I'm not going to sit here to 'hunt & peck' to retype it. Short version, is I recommend you look into HSU, SVS or Rythmik. Those companies will have what you need to play the mega bass in the movies like you desire. I believe you can easily do it for under a $1000. I have found that the HSU VTF series will give you the most flexibility and the best chance of reproducing the bass as you like it. The biggest reason I didn't go with a Hsu sub, is they are built in Red China and when I can find an alternative to China I take it.
I would use the REL you have now strictly for music as you said it works ok, on music.
Good luck,