McCormanck 225 or upgrade my DNA-1 to a or B Rev.

this link has some interesting info by some owners of upgraded 225 and DNA 2, as well as some comments by SMC.

http://forum.audiogon.com/cgi-bin/fr.pl?ramps&1114108053&read&keyw&zzmccormack=dna-225=platinum=edition=upgrades

You should also do some searches since similar topics regarding the upgrades have been discussed here and on audio asylum - amp/preamp

Owned both. The 225 is a an incredible upgrade over the DNA 1, especially in the bass...

I actually preferred my DNA1/Rev A to the original 225. Report is somewhere on www.stereophile.com

Kal