The heart and soul of any loudspeaker are its drivers, the transducers that in response to the amplifier's demands pressurize the air and generate the music. Each driver must be optimized for the task at hand. In the FR20, it quickly became apparent we could not source from even the most advanced driver manufacturers in the world the ultra low-distortion high-dynamic output drivers we would need to build the FR20. We started with our tweeter and midrange for here are the two most difficult drivers to perfect. Moving air at high frequencies without colorations or distortion is a daunting task. On the FR20 we chose to go with a technology that has the speed of an electrostat with the dynamics of a cone. Planar Magnetics. These ultra-low distortion drivers are equally driven with front and rear magnetic structures that offer inherent linearity through symmetrical “push-pull” neodymium motor structures and directly driven ultra-low mass diaphragms with none of the cone or dome breakup, inductance modulation, or hysteresis distortion that plagues traditional drivers. For the low end, we crafted long-throw high-excursion woofers with massive 12-pound motor structures that match the effortlessness and transparency of the planar magnetic drivers. To lower distortion, we employed a unique split magnetic gap and a double faraday ring for low, linear inductance and wide bandwidth, coupled with a single progressive Nomex spider with stitched-in lead wires. The woofer cones are a low-mass PMI foam core with non-woven carbon fiber skins on each side. Lastly, to achieve maximum linearity and extended deep bass extension without the compression and distortion of ports, we designed our own high-compliance passive radiators.