Decora® Strauss™ Transformer-Free™ and transformer free impedance matching volume controls, combined with premium installed speakers, can be used to design a no compromise installed multi room entertainment system that delivers the best reproduction possible from today ultra wide bandwidth digital sources. In multi-room distributed audio systems, the source of undesirable speaker coloration usually perceived as a muffled inch sound is often the volume control itself, because the audio transformers AKA auto formers used in conventional controls can actually filter the bass and treble frequencies. The Decora® Strauss™ Transformer-Free™ volume controls use audio grade cermetile resistors to change volume levels while leaving the audio signal unaffected, resulting in ruler flat frequency response across the entire audible frequency range. Moreover, the Decora® Strauss transformer free volume controls eliminate the problem of saturation-inch associated with conventional volume controls with their ability to instantaneously handle the full peak output power of any consumer-grade amplifier on the market today. The award-winning Decora® Strauss transformer free matching controls are available in two versions regular and impedance matching.