A loudspeaker of improved construction includes a frame and a toroidal magnet that is affixed to the rear of the frame. The apparatus includes upper and lower optical systems that allow for simultaneous imaging of frontside and backside alignment marks. The light fixture may be used in conjunction with a building automation system. In addition, consistent with yet other embodiments, the computer-implemented systems and methods may include a process for outlier detection and removal based on a computation of residuals. The different voltage source terminals are coupled to and supply current to at least one of the cells.