The LASA concept includes using a linear power supply rather than the switch-mode supply that many companies use. "Our power supply consists of a toroidal power transformer that has mu metal shielding to prevent magnetic disturbance from the mains [from entering] the unit," Reis explained, adding that the transformer also has electrostatic shielding, "to prevent any stray coupling between mains and the unit." There are separate power supplies for the control and audio circuits, and complete galvanic isolation between all the supplies. MBL also uses low-drop, fast-recovery rectifiers to give a low level of power supply-generated noise.