Types and reason to use of not

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

If you're going to use the AES/EBU XLR connection, make sure the cable is rated for AES/EBU service, and is a 110 ohm cable.   

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.