The Wunder Audio Cobalt Pre and the Wunder Audio Allotrope EQ are the result of years of testing, development and enhancements made by Wunder Audio in Austin, TX with the PEQ1 and PEQ2. The inside of these discrete Class A build-quality modules is pristine, with meticulous wiring and impeccable soldering. Top-of-the-line components are used at every junction, highlighted by our own custom wound transformers. The transformers are made using the same custom laminations of Nickel/Iron/Cobalt that were used in the original Zeppelin "Allotrope" modules; which inspired the original Wunder Audio PEQ1. The transformers are so beefy that they barely fit in the unit's case.