Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Waste of money:

It was a waste of money as it didn't work at all. I had to end up buying a new surround sound system and now I'm out the money for this converter as well as the digital optical cable and the digital coaxial cable. My new tv has the digital optical out and my old surround sound system had digital coaxial in so everyone told me this was what I needed to be able to keep my old system as we really liked it as it was a multi disc player as well. But this didn't work at all you could hear it trying to work but I think it's defective it would make a humming noise every once in awhile but not produce any real sound. And yes I set my surround sound system to the digital in setting so it could receive the signal.