You may be right to use single ended interconnects since you are using a receiver as your preamp. Prior to purchasing my Marantz AV8805 I was using a Marantz SR7009 as a preamp. I always had a 60hz hum and it went away with the new preamp and balanced connectors. If you don’t have any noise then it is not worth trying to do a balanced conversion. If you decide to go with a new preamp down the road then you might consider the balanced option.