£50 ono FLI SUB-WOOFER BUILT IN AMP 800W ?

fli sub with brand new 800w mutant sub the fli speaker packed in so brought a new one had it a day and then got a good deal on a 3600 watt sub so i swapped to that so the speaker is brand new unused just been put into my fli enclosure works brilliant built in amp cann show it working before leaving with it 50 ono