New Old Thiel CS6 Speakers--Too Harsh

Obviously, I’ve not been in your room, but let me suggest a few things.

(1) with bare walls and ceiling, you have a lot of reflections. If there is slap echo anywhere, you need to kill it, preferably with a combination of diffusion and absorption. Same with 1st reflections from sidewalls. Both cause irritation.

(2) I owned a pair of Thiels -- maybe CS 2 or CS 3 -- about 30 yr ago. I found them so tipped up that I built a high-cut filter to go between my pre and power amp. That was a different speaker, of course, but I don’t know of any Thiels that have been described as "mellow."

You probably need to treat the room, at least a little. You may need different speakers, as well, or a good EQ, or both. (What kind of music do you listen to? If it's violin sonatas, you DEFINITELY need to do both 1 and 2. ;-) )

Good luck! Have fun!

Not sure about the Kappa's and how they sound but I can tell you having owned Thiels for 20 years they are great speakers.  I am using CS6 in my system and also own a pair of 3.6's.  You have some great speakers and to get the most out of them, like any great component, you have to build a synergistic system including cables, around them.

I think your source could be an issue, not sure because I don't listen to streaming or rarely digital.  Your Thiels will let you know right away if the tone leads towards brightness which can be a symptom of digital or even some vinyl.

I am familiar with your amp.  I love CJ and considered this amp for my system.  Around this time CJ began using Teflon caps.  The teflon caps are definitely more revealing especially on the top end.  I have a CJ ET5 which also uses teflon caps and is a departure from the warm romantic golden glow of CJ past.  This also takes careful system matching.

What cables are you using?  

Finally, good advice with your room above.  It is on the small side for the 6's but can still work with some placement experimentation and first reflection absorption or diffusion .  Thiels do not like walls, front or sidewalls.

You bought great speakers but they are definitely not plug and play.  They are speakers you build around not finish off.  Good luck and have fun with it!

Your source is causing the sharpness period.  I just went though this with an owner of the 2.4s and the newer versions of the larger speakers. He was amazed when we swapped out the source with a better one.

Happy Listening.

bigkidz,

I can't make sense of your claim.

What could the Oppo 105d possibly be doing to the signal, either playing media or streaming, that could cause "sharpening" of the sound?

I had a similar experience after purchasing a pair of Thiel CS 3.6's.  I thought they'd be a good match for my CJ MF2300A.. Turns out the CJ wasn't capable in this matchup.  Replaced the CO with a Sunfire 300 and was instantly in business.
You'll find plenty posts on Thiels and amp capabilities.  Once you get it right you'll be smiling.  
Enjoy.