I own Proac D-40r speakers and based on my experience I think the Nagra amps would work with the Proac speakers, but would not drive them to high volume. I had Quicksilver V-4 amps and while great did not have the bass grip I wanted. If you listen at moderate volume they should sound great. If you want to play a lot of rock and symphonic music at fairly high volume levels, they may not be the perfect choice. That said I have not heard the Nagra amps so take my comments on power and tube amps in general as my opinions and best guess.
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