In my experience, an 8" sub only enhances the bass, it will not allow you to feel the effects, even a 10" sub is barely felt, IMO. You need a 12" driver to really move the air and be felt. I would send that little 8" packing and save up till you can afford the EP350 or PB12-NSD or similar. Looking for a used 12" sub as well will save you some money.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70