first of all you will want a slightly biggar ref pic. here is one
second, here are my crits, to explain what i did:
the bass tube air port the edges are more rounded rather than flat and sharp like you have.
and the speaker on the side of the bass box needs to be closer to the top of the unit. the bevel on the top also needs to be a big "biggar"
the necks on the holders look to be a bit larger than they should.
and you need creases on the edges of the speakers to be more accurate.
also noticed that the base of your speakers is too thick and has an odd bevel on it, the bevel needs to be more even around the entire base, try using offset when you extrude.
First year 3D Grad