TruAudio has improved the actual speakers by redesigning and enriching the crossovers as well as using completely new woofers. The new Glass Fibre woofer (in the R2 models) is a rich sounding, stiff material that provides extended bass. The upgraded Carbon Fibre woofer (in the top of the line R3 models) is the best of both worlds – smooth, clear midrange and deep, rich bass. EZFrame uses magnets to hold the flat, low profile grill and surround in place. Making it easier to install, adjust, remove and paint.