You didn't say what IC's the VDs replaced. Were they Transparent Audio?? If they were, I'd put my money on the dedicated lines!
VD makes good stuff, but it's not going to make that kind of improvement (if any) over Transparent Audio or any other expensive high quality product. What you describe is what always happens after dedicated lines are installed.
If you really want to be fair, now put the Transparent ICs back in, and see if your system doesn't sound pretty much the same as with the VDs. Let us know :~))
VD makes good stuff, but it's not going to make that kind of improvement (if any) over Transparent Audio or any other expensive high quality product. What you describe is what always happens after dedicated lines are installed.
If you really want to be fair, now put the Transparent ICs back in, and see if your system doesn't sound pretty much the same as with the VDs. Let us know :~))