Why does my Mac automatically connect to my sound bar?

I have a MacBook Pro 13" Late 2011 model and I have paired it to an Orbitsound M9 Soundbar. My problem is that everytime I am on the computer and it is in range it automatically connects, I dont want that to happen, I just want to connect to it when I feel like it, not all the time.

Any help with this wee issue would be great!!