I have not heard the new generation of Pass but would offer some things for your consideration. The first is the usual reason for increasing power is to get better bass, which does not apply in your case. Would the extra power be of use to you? The second is that with top quality amps the circuits are usually the same but with increased number of transistors , etc. The penalty for doing this is that it increases the complexity of the circuit. I recently faced a similar choice when I decided to buy a Musical Fidelity Integrated amp. I could choose between the Nuvista, Trivista, Kw500, or Kw550. There was a price differential of course but it was not insurmountable. In the end I chose the Nuvista as it had the fewest number of transistors and therefore the simplest circuit. It had plenty of power for my purposes and I am very happy. With an amp like Pass that runs class A all the way it would be hard to see how the bigger amp would improve upon the sound of the smaller one as long as it is operating within its power range. Also do not forget that the larger amps will generate more heat and consume more electricity. As a former Krell dealer I can tell you that this is not to be ignored, not to mention that large class A amps range in weight from very heavy to why didn't they put wheels on it.
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