I agree with Soix's recommendation of the Geddes book. Don't let the title put you off - the chapters dealing with acoustics and room construction are totally applicable to two-channel.
If you'd like to engage a top-tier professional who is still affordable, I suggest award-winning acoustician Jeff Hedback of Hedback Designed Acoustics. His day job is designing recording studios (many of which are used by grammy-winning artists and producers), but he does work in the home audio world as well.
Duke
If you'd like to engage a top-tier professional who is still affordable, I suggest award-winning acoustician Jeff Hedback of Hedback Designed Acoustics. His day job is designing recording studios (many of which are used by grammy-winning artists and producers), but he does work in the home audio world as well.
Duke