A real sleeper. Battery powered with a smartly designed charger that never lets the preamp see VAC. Unlike some other battery powered preamps I've heard, the Quantum passes all of the bass signal. Remote control is not a part of the design philosophy here. Thank you. Unexpectedly, my new favorite feature of the Quantum are the two phase inversion toggle switches on the rear panel. It seems recordings are made with no default phase and some heavily multitracked recordings have individual tracks out of phase all together. Filping these switches can have a positive effect on most purist recordings.