boleh sangatlah bro...less than 1k also possible.
some people spent 1k++ just for hu or amp etc. but its depend to you.
look your wallet not theirs. wat pay is wat u get...

bro with ur current budget, don't go for complete set. feared some day u will be feeling that you're wasting ur money...

underseat sub powered by internal amp while "box subwoofer" driven by external amp.

i used underseat for 3 months only, then back to sub again ( diff. brand from the earlier one ), coz underseat sub can't satisfies me...haha...perabih duit jer...