Nevermind-you live and learn.
I just returned my Audioengine 5's, they didn't sound as great as my sennheister hd 280 headphones and the bass was well "rubbery" - you really do need a subwoofer, unforutanly while they say you can hook up a subwoofer, its only possible with an adapter before the audioengine 5 connects, you'll have to run the sound into the sub, set the crossover and then run it out from it.
They should've put rca inputs. Oh well, you live and learn, guess ill just ues a 7.1ht setup with my comp.