Probably not the most secure thing in the world, I am not a knot master, but the rope is really thick and the speakers are very light. The placement they are in now really fills the room much better than before, they were lower on a short little table.
thanks ill look into it ! im using a tautline hitch on the speakers which I think is secure. my concern is at the top (you can't see) where I tied the speakers to some hooks on the ceiling. Im concerned the hooks will come out of the ceiling or my knot isn't very good. I didn't use google to find me a good knot for this part I just winged it because I was tired.
A bowline on the top will be fine and can look good.
Hooks should be in wood or your speakers will work the hook out.