hifi engine

jbl lx2000 sub

Ive had this sub for 5 years using it as a side tabel for my armchair.ive just decided i want to use it and have wired it up how i thought it should be but the speakers ive wired into it dont work (they are ok) and it just puts out a really crap sound.anyone clever enough to tell me where im going wrong.i got given it and know nothing about it.not sure if its for home cinema or stereo.your input would be gratefully appreciated.