Apologies if I offend but Jesus H Christ some of you need to actually READ the OP's post before firing off with totally irrelevant to him suggestions of hardware he could buy.
He DOES NOT WANT YOUR HARDWARE RECOMMENDATIONS!!! <------read several time before posting.
He wants to know why would there be so many converter cables without DAC converters for sale
He wants to know if he uses one could it damage his hardware.
Thats all he wants.
FFS!