mmmm.....disagree a little bit on budget product. They are not cheap as you think it is.
Last time a friend was looking for a sub, mohawk sub (forgot what model but their top line) was selling RM1100, kicker CVX is rm1300 (after discount). Friend bought mohawk....powered by hifonics brutus 1000w, sub barely moving and SPL is similar like ppl knocking at your window. Sold them and bought CVX and difference is like night and day. Bought Fi Q for rm1300++ (including shipping) and was very happy.
Their (so called) 2000w amp (I never measured it) selling about rm2300 and my sundown saz1500d was rm1800++. My amp puts about 1800+w and barely gets hot. Their amp is so hot you can do toast on it. Power wise, I never measure any of their amp.
I wont say its not good but you can have better out there if you know where to look