Types and reason to use of not

Great answers, thanks, I will bypass the optical, go for trying my old RCA on my new set up first. I am getting an Anthem STF integrated and a second Anthem STF power Amp. for the second pair of speakers.  The STF integrated has a Room Correction digital process system inside and likely works better processing digital signals.  The AES/EBU port on back looks like an XLR, but is a single port, not L & R.   My lack of understanding of cables prompted me to ask.  I guess a Coaxial cable has ends like an RCA, but a coaxal shield to stop EMF.  I assume the better RCA cables that are shielded are not the true "Coaxial" digital cable and I need to get the true Coaxial cable, not just a shielded RCA?  

dpop, thanks, the 110 ohm spec is clear to me now, if I use the XLR port marked AES?EBU, I will make sure the 110 ohm rating is present. like the Coax using the RCA, the AES/EBU uses the XLR end, but the cable between ends is different/better.  

I know nothing about Lear Jets, or electronics, I am a retired water professional. Music lovers can love good stereos, and be at a loss for specs & DOS type glossary.  I was wanting to avoid spending money on a cable that was not needed. 

dpop, I did not know that, thanks, I will make a reference to that someday as an OMG!  Well I will likely start with my RCA, then swap to the Coax, and where I can I will use an XLR.  After putting 10 grand + into the 2 new Amps, I guess I am not really in a hurry to up fit cables anyway, I will take your advice and "join the club".

Thanks, Greg

Such a cable did not come with the integrated amp, having that port, I will read the manual to see the advantages of that one cable vs the pair RCA or one coaxial that go to the 2nd. power amp. I am using 2 sets speakers, one set 4 ohm, other 8 ohm.  Did not want to use the intenerated amp down to 2 ohm, even though it is listed in the specs as 550 Watts at 2 ohm.  I will just start using RCA L & R.  I am assuming I will want to use the AES/EBU if I get one.  There are a couple power cords flopping around back there.  I do not have shielded power cords. Are they worth it? I can keep a few inches between all cables as it is, and only cross, not side by side the cables.