I can only add my experience. I have the same speakers as the OP. I borrowed a C272 from my dealer. I used my C3320BEE as the pre. I figured it would be a "slam dunk" improvement.
It turned out to be a big disappointment and a valuable lesson. Synergy must be at work with the NAD integrateds. The 320 was smoother and fuller. Listening to it you would have thought the 320 was more powerful than the 272.
I've used a tube pre on my 320 and that was a substantial improvement. Everything from soundstage to tone to detail and resolution improved. That led me to the conclusion that the pre section of the 320 series of integrateds was the area to gain from an upgrade the most. I hope this helps.
Cheers,
Scott
It turned out to be a big disappointment and a valuable lesson. Synergy must be at work with the NAD integrateds. The 320 was smoother and fuller. Listening to it you would have thought the 320 was more powerful than the 272.
I've used a tube pre on my 320 and that was a substantial improvement. Everything from soundstage to tone to detail and resolution improved. That led me to the conclusion that the pre section of the 320 series of integrateds was the area to gain from an upgrade the most. I hope this helps.
Cheers,
Scott