The invention enables a gain adjustment in a receiver to improve signal quality by varying resistance of an input resistor array of a bandpass filter, the array having a plurality of resistors in series with switches that out of the path of the current when the resistors are in use. The first common layer includes first and second regions. The integrated structural system also includes a metal structure integrated with the molded duct system by means for integrating the metal structure with the molded duct system forming an integrated structural load path assembly.