Disappointment with Pass Labs - I'm looking for something else


Hello, I am new to this forum and my mother tongue is not English, so please forgive me if I make mistakes as I use a translator.

I recently bought an XA30.8 and an XP12. I was very happy but as time went by I began to not feel comfortable with the sound.
After doing many tests, I find that the XA30.8 sounds very very sweet but actually too much. I find it to be a loosely defined amp, somewhat muddy and lacks a lot of air and grip. The soundstage is very closed.

The XP-12 is the worst of the two. It is a previous that removes a lot of resolution and information, without transient attacks and sunken mid frequencies. Instead it brings warmth.

Has anyone of you found the same?

If you ask me, I have a Klipsch Cornwall and a dCS BArtok.

Now I want a capable amp, forceful, something warm, decisive, airy and with a great soundstage.

At first I thought of changing my XA30.8 for X250.8, and changing the XP-12 for a second-hand Audio Research Ref5. I am afraid of this change and continue with Pass, since I can go back to the same thing a bit.

On the other hand I have thought of going for a Luxman 900 combo, since it has very good reviews and from what I have read it could be the winning ticket.
opm
I had pass amps and I think they are designed for speakers with very high detail like wilson, magico, b&w D3, etc
Any amplifier that has a fully balanced design will eliminate all even-ordered harmonics, and thus will be 3rd harmonic dominant.  
This is what is known as a 'cubic non-linearity' as opposed to the quadratic non-linearity that expresses a dominant 2nd harmonic. Of the two, the cubic has the property of harmonics decreasing at a faster rate as their order is increased. So such circuits tend to sound more neutral since the ear assigns a tonality to all forms of distortion.
The best suggestion I have read in this thread is for you to select your speakers and then the amplification.
I would like to contribute something positive here, I suggest trying some speaker cables that add more resolution and dynamism, I recommend Kimber Kable Carbon 18 XL or similar. It can also be Shunyata Alpha v2. 
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