Model T101 / T101c T301 / T301c T-2 Design Two-way closed box Two and a half-way closed box Closed box powered subwoofer Drive units 115mm (4.5in.) dual layer MF 25mm (1in.) aluminium HF 2 x 115mm (4.5in.) dual layer MF 25mm (1in.) aluminium HF 1 x 250mm (10in.) Frequency response 80Hz - 30kHz 80Hz - 30kHz 30Hz - 250Hz Crossover frequency 1.7kHz 1.7kHz N/A Amplifier N/A N/A 250 Watts built-in Class-D Amplifier requirements 10 - 100 W 10 - 150 W N/A Sensitivity (2.