Supra Cat 8 Ethernet cable

3 absorption panels opposite system? Meaning they’re where, behind the listening chair?

Also, I forgot to mention room acoustics. Probably most important and most neglected as we tend to focus on easy changes such as cables. This should definitely be at the top of the list. 

Run the supra in for at least 100hrs. It’s a good cable, never sounded harsh or bright. I was using it for quiet some time until recently when I switched to Network Acoustics Eno streaming system which sounds more relaxed and refined. 

@ram18 don’t get sucked into the cables game at this level.
Upgrade speakers and components instead for better ROI….just my opinion. 

@ram18 yes I used Supra CAT8 to connect the EERO access point and Lumin U1 Mini. 

@ram18 can you describe your set up feeding the streamer? Router, access points, switches etc.

Also, do you use Roon, your streaming service(s), how do you stream…Spotify or Tidal connect, Bluetooth, airplay or bluesound app and whether or not you have any DSP or upsampling enabled anywhere in the chain (Roon or Bluesound).

@ram18 ok. If the router/switch has a ground screw, try grounding it. It may or may not be an audible improvement but definitely worth a shot and will cost you far less than buying and trying more cables. Free advice, take it for what it’s worth. 

The Supra Cat8 cable saw various components come and go in my system but it was never a culprit of any problem. It was a notable upgrade in sound vs the standard yellow Ethernet cable.
IMO, you have 2 suspects when it comes to isolating the source of potential harshness in sound…your XTZ amplifier, which is a budget Class D amp, and your Klipsch speakers. Some Class D amps with an exception of a few in the thousands of $ price category (i.e Bel Canto Class D ref monos) can be a bit hot sounding in the treble although I admit I never heard XTZ, it is just a suspicion. Couple that with Klipsch and you may end up with the sound you’re describing. It’s possible that adding the Supra Cat8 had simply exposed some weak links in the chain.

Like I said earlier, don’t get hung up on cables at this level. Especially Ethernet.

If you like your klipsch speakers and want to keep them, a good solid state Class A/B or even a tube amp may be your ticket. There are many choices out there especially on a used market that will not break the bank. Anyway…just my thoughts. 

There usually is a ground screw on the Ethernet switch. What model is it? Or are you referring to a router as a switch?

Research room acoustics. There are good videos on YouTube by New Record Day.
Also check out GIK Acoustics. I don’t claim to be an expert by any means but a common approach is to at least treat the first reflection points walls and floor being the easiest. As well as the wall behind your speakers. 
This may take your listening experience to the next level with all your current gear.