I know I would inflame many members by saying this, but I'll do it anyway:
I never heard Adcom, but I owned various preamps at different price points, and came to conclusion, that if you are on the path to find "miracle component" and " a giant killer", sooner or later you'd realize they are pretty much non-existent entities. Miracles do not happen in this hobby, and to a certain point (point of diminishing returns, that is) you get what you paid for.
If it was that easy to create $1400 preamp equal to the best $10,000-15,000 units, somebody would've done it by now.
Do arrest me now.