Dohmann is an Australian turntable maker whose Helix turntables are built around vibration isolation. The Helix turntables have a MinusK negative stiffness platform built into the chassis, designed to isolate the turntable from low-frequency vibration. The company groups its noise-reduction work under the name Micro Signal Architecture, aimed at removing mechanical and electrical noise from the signal. The compact Helix model uses an external DC power supply and suits smaller rooms. Dohmann also offers tonearms and custom armboards for different playback systems.