Armandido, you will find the thread on X series vs X.5 series at the following URL:
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1100367851&read&keyw&zzpass+labs
See you there!
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1100367851&read&keyw&zzpass+labs
See you there!