Sure, it is safe. You won't have any problems and you will have a chance to re-evalute how good the cables you sold were. I did the same thing, and could not wait to get rid of the cheap cable I was using though the Lat stuff I use now could hardly be expensive but is an excellent value.
Is it safe to run cheap wires?
I am in the process of upgrading my speaker wires. I sold my old ones and I dont have the new ones yet. I have two Classe Audio Ca-400's that I run bridged. (roughly 1200 watts per channel) It will be a few weeks before I have my new wires and I was wondering if it was ok to use monster cable until then. I know the sound quality isnt going to be the greatest but is that to much power for the cable?