I agree that the amp should be sent back to Berning and also agree that cables, cd players and tubes should not be changed yet. Acceptable performance should be achieved out of the box.
However, being more than familiar with both the Z270 and the Proacs, I think that it might be a component mismatch.
Proacs are warm, smooth and laid back and use average drivers and cheap crossover components (yes, I know they cost $4500). They are not the last word in speed and transparency. The Berning, OTOH, is all about speed and transparency. This would leave me to believe that the Berning is not complementing the Proac's strengths, but revealing its weaknesses.
If the Berning does not work out try a Conrad Johnson Premier 11A (great relatively inexpensive amp and I regret selling mine) or Audio Research Vt100 (more power but has a fan in it). Stuart Tyler of Proac voices his speakers using Audio Research amps. Lastly, if you want the ease of solid state try the 47 Labs Gaincard; I was shocked by the musicality of this combination.
However, being more than familiar with both the Z270 and the Proacs, I think that it might be a component mismatch.
Proacs are warm, smooth and laid back and use average drivers and cheap crossover components (yes, I know they cost $4500). They are not the last word in speed and transparency. The Berning, OTOH, is all about speed and transparency. This would leave me to believe that the Berning is not complementing the Proac's strengths, but revealing its weaknesses.
If the Berning does not work out try a Conrad Johnson Premier 11A (great relatively inexpensive amp and I regret selling mine) or Audio Research Vt100 (more power but has a fan in it). Stuart Tyler of Proac voices his speakers using Audio Research amps. Lastly, if you want the ease of solid state try the 47 Labs Gaincard; I was shocked by the musicality of this combination.