help choosing cable pc to dac.

As a follow up on my last post. The OPs' sound card outputs through 3.5mm analog using internal DAC or SPDIF using optical. 

A USB/SPDIF converter will not serve unless the OP chose to bypass the sound card and use USB which would require the purchase of a USB DAC or USB/SPDIF converter/DAC combination.

Regarding use of the 3.5mm analog output the choices are: 1) the 3.5mm to dual RCA cable under consideration, or 2) the suggestion made by audioman2015, use a 3.5mm to dual RCA converter with standard RCA interconnects.

One other option would be to purchase one of the inexpensive DACs from China off Ebay with optical input along with a toslink cable and a pair of RCA interconnects. My question would then be how to best divide the 18' between the two cables.

Any reason i can't use a single run of my older monster cable with a 3.5 to rca adapter?I t can go to the xtra coax plug on my ps dac.This would suffice until i choose type of gear i need/want in the future.It all changes so fast.Thanks everyone.RW

Somehow I seem to have let myself get confused. After rereading this thread I am now aware that you have a soundcard with coax output and a DAC with coax input. I would use a 1.5M coax between soundcard and DAC. Use a Pair of RCA interconnects of the desired distance between DAC and preamp input. 

I only have a single rca input on dac. see 8th post.can i use a non digital single cable for now?Just trying to hear music from main syst.I'll ad the good equip. later.

Since your interest is for background music I suggest you try it.