Types and reason to use of not

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. 

I know nothing about Lear Jets

You mentioned 8-tracks, and I believe William Lear and Learjet Corp. designed the 8-track tape. 

 I was wanting to avoid spending money on a cable that was not needed. 

In this hobby, we audio-enthusiasts try different combinations of cables and equipment. We're constantly in search of the best audio reproduction we can achieve with our gear. Many of us simply use our ears to determine what sounds best to us in our environment. It's all very much a learning experience.  

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

@gregchick0

The AES/EBU port on back looks like an XLR, but is a single port, not L & R.

That single AES/EBU digital XLR actually contains L&R stereo audio.

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.