which preamp match best with Krell Evo 402 ?

I would also suggest a tube preamp or a Marklevinson pre which i also like , but bringin in some bloom is a good thing and there are lots of good tube designs to choose from , if you talk squicky clean/dynamic and want phono as well than a plp is a nice choice

I read you ve bought the ARC already , also a nice choice, A zanden pre/ powerful solid state combo should also be nice i think i havent seen it anywhere yet