Dusty,
Somehow I must have missed the XDC-1 release.
From what I have read the XDC-2 will not provide protection against power surges, brown/black outs. I read an opinion - on the Richard Gray web site, I think - that transformer based amps are insensitive to these and therefore do not need such protection. (IMO that statement must imply that the source and pre-amp which feed into the amp are protected in some way.)
Please comment. Would D-200 via XDC-2 require or benefit from additional surge protection?