Amp match amp for B&W 601 S2 speakers

Hi everybody.

I'm looking for a piece of advice regarding an amp-speaker match.

I have an NAD C370 amp and a pair of B&W 601 S2 speackers and a set of Dali Concept 1 speakers which runs as my B speakers.

In my opinion the B&W speakers lacks some midrange and/or clarity with the NAD C370 amp. The sound I'm looking for should have a solid bass/bottom to it and some clear top end. A bit like the Dali speakers, but with more bass/bottom to it.

I'm thinking of switching the amp to a Marantz amp. Would this help at all or does anybody in here have an advice of which amp runs well with theese B&W speakers?

And thanks for you taking the time :)