I did research on the Theta Dreadnaught amps a long time ago. The Theta amps are slightly on the laid-back side of neutral, so if you are wanting to keep the type of signature coming from your Marantz amp, it might be the way to go.
The Krell sound is more high-bandwidth with increased attack/clarity. If you want a more exciting type of sound, choose the Krell. However, some people don't like the Krell because of it's forward "in your face" type of signature. Always, it depends on system synergy and wire components.
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