ESB 3.28 Tremila Series 1.1 Inch Dome Tweeter 90w RMS Pair3. 28 1. 1" 28 mm Dome Tweeter The tweeter uses a Torcon diaphragm for a smooth sound, with an outer suspension covered with a high loss damping material to eliminate edge vibration and resonance. The dome is of extremely low mass and is much less susceptible to mechanical deformation than other tweeters, yet it provides a smooth, linear and very extended response. The 28 mm voice coil has an aluminum support and very light copper coated aluminum