My exp. with Focal Sopra No.2 , Harbeth 40.2, Passlabs XA30.5 and Hypex NC400


Hello. Long time reader here.

I want to share my listening experiences since i bought my Sopra No.2’s last year. I think it may shed some light on people who suffered from brightness on their system. Please excuse my English as it is not my native language.

My other components are Primaluna Dialogue Premium Preamp and Gustard x20pro Dac with Singxer SU-1 via HQ-Player and Roon. Interconnects are DH Labs Silversonic and speaker cable is Kimber 8TC. My room is 45m2 and not treated. I would say my room has some echo and can sound harsh on higher volume levels. (I will deal with this later hopefully.)

I will try to keep it short below:

Sopra No.2’s with NC400’s:
Pros: Extreme clarity with huge sound stage , speed&timing , dynamism , attack , total control on bass , good instrument separation. NC400 allows all this without breaking a sweat.
Cons: Fatiguing after some time , especially with higher volume. Bright and forward on almost half of the music i listen to and neutral on the other half but never warm. (I listen to almost every kind of music though it’s mostly Jazz both with vocals and instrumental only.) Mids and low-mids(esp. on vocals) were not rich and full as i wished.

The fatiguing alone bugged me to change my speakers and my dealer sent me Harbeth 40.2’s to try at home.

Harbeth 40.2’s with NC400’s:
So compared to Sopra No.2’s it was less hi-fi and more of a live music experience with the midrange of Harbeth’s as we know it. Non-fatiguing , just slightly warm ,sweet sound and overall a wonderful match with the speaker and the amp. Believe it or not it was more than just a glimpse of when i listened to 40.2’s with Dan D’Agostino MOMENTUM LIFESTYLE AMPLIFIER. Last weekend we tried the NC400’s with my brothers SLH5’s and i think he is now considering selling his Naim setup which is 6 times more expensive then NC400’s :)

I wanted to keep Harbeth 40.2’s but we could not agree on price with the dealer so i kept my Sopra’s and decided to try a well regarded amp with it. That was Pass Labs XA30.5.

Sopra No.2’s with Pass Labs XA30.5 :
Brightness and fatiguing gone for good. You get the magical warm sound of Pass Labs , suddenly Sopra’s are different speakers now. The amp really has it’s own color as they say. Bass is less controlled and almost too slow compared to NC400’s. I was worried about 30w is not going to be enough for my room but i never miss 200w’s of NC400’s unless i listen to electronic dance music.

I am never selling my NC400’s as they will come handy when i want to listen instrumental tracks or EDM.
For example , Chuck Mangione - Children of Sanchez or Charles Lloyd & The Marvels - La llorona gives you goosebumps when listened through NC400’s while with XA30.5 they won’t impress you as much.
They are really more than their money’s worth but the XA30.5 is still a better match with Sopra No.2’s.

I guess i couldn't keep it short. Oh well..


tonediary
I had similar results with my Nord Acoustics Hypex NC500 based amps paired with my Martin Logans.  When I first got them they were a significant upgrade from the older class D amps I had in before.  They were very controlled and detailed with a low noise floor, but I found them harsh at times and fatiguing at high volumes.  I upgraded again to the PS Audio BHK300s - not a fair fight, as these are much more expensive amps, but the hybrid tube/ss amps resolved the brightness and fatigue I was experiencing with the Hypex ones when paired with my electrostats, and I lost none of the detail (though my noise floor did go up).

The focal sopras were my 2nd-most favorite speakers when I was demoing last year, but the Martin Logan Expression 13As just imaged sooooo well when set up right, and now that they are paired with better amps, I'm very happy.  
Same experience I had with Ncore (NAD M22) and Sopra 2's.  They werent bright or harsh, just sterile and uninvolvimg.  The dealer even said "that's the best Class D I've heard in here" which was quite the indictment of previous class D because the Ncore were getting smoked by the class ab amps.

These speakers are just so sensitive to amplification.  The Pass amps are a great match and so was Perla Audio which is what I ended up going with.
Nice to see @shiner01 @emcdade @prof  had same the experience with Ncore amps and/or Sopra 2's. 

One other update on my setup would be the Duelund DCA16GA speaker cables (connected to Passlabs xa30.5) which made a significant difference on smoothness and much more analog sound overall. I can confirm others that this cable is magic. Normally my ears don't even really notice that much of a difference between cables. I will now try DCA20GA as interconnects.

I really need to decide on a new Dac though. Stuck between Holo Spring LVL2 , Gumby or a used Dac that uses an Ultra Analog 20400A chip.. That's if i can find one..
You can try Tube amplifier on your Soora 2.

Nice starting point is Rogue Cronus Magnum ii with 100 watt.
This post and it’s replies are wide ranging, so I will just stick to this- if you use digital as a source (streaming, cd, etc.), a class A amplifier is the way to go. Hence the OP’s conclusion using the Pass Class A amp...
Digital is sliced and diced and reassembled for your listening pleasure. Class A amps have one less major slice and dice added to the end result. As Wally Malewicz (look him up) said to me at RMAF, analog is steak, digital is hamburger. 
Having said that, I am currently using a CD player as my source. This is not an endorsement of analog as the be-all end-all of listening pleasure. 
Adding a class A Integrated (Luxman L-590AXII) was the best and most obvious sonic improvement I have ever made in my 40 years as an audio enthusiast.
Enjoy whatever you have at this moment!