The invention is directed to lead configurations for sensors that allow for less invasive sensor replacement procedures. In accordance with at least one embodiment, a method is provided which comprises forming a loudspeaker frame so as to define a driver housing portion, a horn portion, and a conformal portion. The threshold level is set using the correlation noise level and predicted signal strength. The dual-section back portion folds together to form a single planar construct and also folds to the seat pad portion, again to form a single planar package of collapsed \u2018Z\u2019 shape for transport or storage.