There was a recent thread on this. The phase inverted effect is known as "Woods Effect"--run a google search. I gather some recordings may invert phase anyway, so you can't *always* have it right anyway.
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1083195224&read&keyw&zzphase+inversion
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1083195224&read&keyw&zzphase+inversion