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I'm having a Meier Corda Cross-1 built by Head-Fier Picopa. I suggested he split the grounds to make it possible to modify it later for a balanced system, and he pointed out that it might not be that simple. After further discussion, it seems to me the circuit,
http://web.archive.org/web/20090521143201/http://www.meier-audio.homepage.t-online.de/passivefilter.htm
is not amenable to balancing at all. Would you have to crossfeed the complementary signals separately from the positive signals? How would you ensure the complementary crossfeed is accurate with the positive one? Has anyone cross-fed a balanced system?