ESB 3.65 Tremila Series 2.5 Inch Component Cone Wide Range 60w RMS Pair3. 65 2. 5" 65 mm Cone Widerange This 3. 65 wide range speaker is designed to operate in a 3 way system, with a woofer and a tweeter, or in a 2 way system where it can replace the tweeter. Conceived and purpose built from the ground up, it offers exceptional transient response and outstanding linearity, resulting in unsurpassed clarity and natural midrange reproduction. Distortion and non linearities have been minimized through critical optimization